West Bengal Board Class 10 Life Science Book Solution in English WBBSE

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WBBSE Class 10 Life Science Question Answer West Bengal Board

WBBSE Class 10 Life Science Book Solutions West Bengal Board in English Medium

Chapter 1 Control and Coordination Living Organisms

Chapter 2 Continuity of Life

Chapter 3 Heredity and Some Common Genetic Diseases

Chapter 4 Evolution and Adaptation

Chapter 5 Environment, Its Resources and Their Conservation

WBBSE Class 10 Life Science Book Solutions West Bengal Board in Hindi Medium

WBBSE Class 10 Life Science Syllabus West Bengal Board 2024

Chapter 1 Control and Co-ordination in Living Organisms

Chapter 1A Sensitivity and Response in Plants:
Discussions should include the following along with relevant diagrams: Living organisms exist in changing environments. Some changes are favourable and advantageous, while others are unfavourable or harmful. Sensitivity is the ability of organisms to detect change and respond to it. Changes that are detected and lead to responses are termed stimuli. Stimulus is a kind of energy. All living organisms respond to stimuli of one kind or another. Many stimuli arise externally from an organism, but others from an organism’s internal environment. As most plants are anchored organ¬isms, plant responses are less evident than those of animals. Rapid movements by plants are extremely rare. Generally, plant responses are slow growth movements or turgor movements. Explain plant sensitivity and response citing movements in mimosa and Desmodium. Brief mention of the contribution of Acharya Jagdish Chandra Bose in discovering the sensitivity of plants. Brief mention of plant movement as a response to stimuli. Types of plant movement: Tactic, Phototactic, Tropic: Phototropic, Hydrotropic, Geotropic, Nastic: Photonastic, Thermonastic, Seismonastic, Chemonastic (Brief mention of the stimuli and response in each case and one or two examples of each with relevant diagrams.) Comparison between Tactic, Tropic, and Nastic movements in Tabular form.

Chapter 1B Response and Chemical Co-ordination in Plants – Hormones:
A brief discussion on plant hormones as substances responsible for sensitivity and response in plants. Also mention hormones as plant growth substances mentioning the phenomena of apical and lateral growth, flowering, bud break, germination of seeds, and tropic movement in plants. Brief mention of the source, mode of transport, functioning, and fate of hormones in plants. Brief mention of the origin, chemical constituent (mention C, H, O, N only), and the role (as mentioned below) of Auxin, Gibberellin, and Cytokinin in plants with relevant diagrams. Auxin: Promotes apical dominance and inhibits lateral bud growth, cell division and cell enlargement, root growth at very low concentrations, fruit growth, and control of tropic movement. Gibberellin: Breks seed and bud dormancy, elongation of internodes, fruit growth. Cytokinin: Promotes cell division, and lateral bud growth, delays leaf senescence. Chemical names of synthetic hormones are not to be mentioned. The terms synthetic auxin and synthetic gibberellin can be used. Mention the role of synthetic hormones – rooting of cutting, dealy of pre-harvest fruit crop, artificial auxin as herbicide, developing parthenocarpic fruits.

Chapter 1C Response and Chemical Co-ordination in Animals – Hormones:
Briefly mention the erection of body hair, maintaining a constant level of glucose in the blood, combating stress, maintaining blood pressure, controlling BMR, control growth and secretion of reproductive glands in animals. Briefly mention the need for regulatory chemical molecules namely hormones for controlling these functions. Explain the source (endocrine glands), chemical nature, mode of transport, functioning, and fate of hormones; Explain the role of the hormone as messenger and regulator (feedback control with an example – TSH and Thyroxine). Mention the differences between plant hormones and animal hormones (in tabular form). Hypothalamus: Controls hormonal secretions of the anterior pituitary gland & produces the hormones of the posterior pituitary gland (ADH and Oxytocin). They remain stored in the posterior pituitary gland and released later on. Pituitary: ACTH, GH, TSH, GTH (FSH, LH, ICSH, LTH/Prolactin), ADH, Thyroid: Thyroxine, Adrenal: Adrenalin, Nor- adrenalin, Endocrine Pancreas: Insulin, Glucagon, Gonads: Testes – Testosterone, Ovary – Oestrogen, Progesterone. The name of endocrine glands, their location, the hormones secreted, and their role in the human body are to be mentioned. Causes and symptoms of the following hormonal disorders are to be mentioned separately – dwarfism, diabetes insipidus, goiter, and diabetes mellitus. A diagram of the human body is to be provided to show the location of the endocrine glands mentioned above. Mention the difference between endocrine and exocrine glands based on the following features (in tabular form): (i) Presence or absence of ducts, (ii) Place of action, (iii) Product secreted.

Chapter 1D Response and Physical Coordination in Animals – Nervous System:
Explaination in brief about neural control and coordination with examples from daily life, setting the stage for introducing neurons, nerves, and the nervous system. One example may be running: leg muscles need extra supplies of glucose and oxygen – Lungs breathe faster and deeper and the heart pumps rapidly to supply oxygen and glucose to the muscles quickly – the brain detects changes in oxygen and carbon dioxide content of the blood and sends nerve impulses to the diaphragm, intercostal muscles, and heart. The coordination of different systems is thus brought by the nervous system. Discussions should include the following along with relevant diagrams: Irritability or sensitivity is a characteristic feature of all living organisms. It refers to their ability to respond to a stimulus. The stimulus is received by a receptor. It is transmitted by means of nerves. Finally, an effector (muscle and gland) brings about a response. Between the receptors and effectors are the conducting cells of the nervous system, termed neurons. These are the basic structural and functional units of the nervous system. They are spread throughout the organism forming a complex communication network. Some common examples may be given to illustrate the pathway: Stimuli – Receptor – Nervecentre – Effector – Response (e.g. opening the door at the sound of a knock on the door/ doorbell). Mention the difference between the mode of action of hormones and the nervous system. Explain the structure and function of different parts of neurons (in tabular form with diagrams); Mention the neuroglia as supporting cells of the nervous system. A brief explanation of types of neurons – Sensory, Motor, Adustor/lntemeurone. A brief explanation of the inter-relationship between neurons, nerve fibers, and nerves (with diagram). Brief mention of Afferent, Efferent, and Mixed nerves with one or two examples of each. Brief mention of the formation of ganglia from the cell bodies of neurons and functions of ganglia. A brief explanation of location and function (Mention the role of neurotransmitter in the transmission of nerve impulse. Detailed mechanism of transmission of nerve impulse across the synapse not to be mentioned.) Central nervous system: Brain and spinal cord. Peripheral nervous system: Cranial and spinal nerves. Autonomic nervous system: Sympathetic and Parasympathetic (In dendrogram format – Mention the types of nervous system along with the main parts of the brain and their regions). Cerebral cortex, Thalamus, Hypothalamus, Mid-brain, Pons, Cerebellum, Medulla oblongata, Spinal cord (only location and one or two functions in brief in tabular form with diagram showing their locations). Brief mention of the location and function of Meninges and CSF. A brief explanation of reflex action with examples; Types – Inborn and acquired (with examples); Components of Reflex Arc with diagram (Receptor, Sensory neuron, Nerve Centre, Motor Neurone, Effector); Importance of different reflexes in everyday life – (i) Blinking eye (ii) Coughing (iii) Sneezing Eye (Outline structure and function in tabular form with a diagram showing different parts). Brief mention of binocular vision in humans and how it differs from monocular vision.

Chapter 1E Locomotion as a Type of Response in Animals:
Discussions should include the following along with relevant diagrams (for near and distant vision). Example from one daily life situation (Role of accommodation in case of pedestrians and vehicle drivers to avoid road accidents by taking note of obstacles, traffic signals, and road directions). The curvature of the lens can be modified to some extent by the ciliary muscles. The change in curvature of the lens can thus change its focal length. Accomodation is the ability of the eye lens to adjust its focal length. The eye adjusts the shape of the lens to keep objects in focus. Looking at distant objects: Ciliary muscles relaxed – Lens becomes thin – focal length of the lens increases. Looking at objects closer to the eye: Ciliary muscles contract – increasing curvature of the eye lens – Lens becomes thick – focal length of the lens decreases. Brief mention of the loss of power accommodation and in this context mention myopia, hyperopia, presbyopia, and their corrective measures (lenses used for correction) with diagrams. Cataract Brief explanation and corrective measure.

Chapter 2 Continuity of Life

Chapter 2A Cell Division and Cell Cycle:
Discussions should include the following along with relevant diagrams of DNA double helix (ribbon diagram), chromatin reticula, and chromosomes. Inside the nucleus of a cell, Fine reticulum-like structures are woven like threads around each other structures are DNA. DNA is a large biomolecule. The DNA remains in folded or partly open condition inside the nucleus, which is then termed as Chromatin Reticulum. In the folded condition, the DNA is wound tightly around proteins. This folded structure of DNA is termed a Chromosome. Chromatin reticula and chromosomes are actually different folding states of DNA molecules. Specific parts of the DNA carry the code for producing specific proteins which ultimately lead to the expression of different characters in an organism. Each of these parts of DNA is termed a Gene. Autosome and Sex Chromosome – Brief explanation with reference to humans. Mention the number of chromosomes in body cells and gametes in humans and briefly explain haploid and diploid states with reference to humans. Briefly explain the following in tabular form with diagrams Chromatid, Primary constriction or Centromere, Secondary constriction, oatelite, Telomere. Briefly mention DNA, RNA, and Proteins (Mention Purine and pyrimidine, 5C-Sugar, Phosphoric Acid, Histone, and non-histone proteins) – Structure and formula not to be included. Brief mention of euchromatin and heterochromatin. Brief discussion on the role of following cell organelles in cell division. Structural details not be mentioned, (i) Nucleus – it is the seat of the chromosomes that are to be divided, (ii) Cen- trosome and microtubule – Formation of spindle fibre, (iii) Ribosome – Helps in protein synthesis, (iv) Mitochondria – Supply energy required for cell division. Brief explanation of cell division and its significance (Growth, Reproduction, Repair). Amitosis, Mitosis, and Meiosis -Brief explanation mentioning the site of occurrence of each type with diagrams. Brief mention of the events (G,, S, G2, M) of the cell cycle with diagram and significance of the cell cycle (Mention that the loss of control at different points in the cell cycle results in uncontrolled cell division leading to formatting of tumor sometimes may becomes malignant and may result in cancer). Brief explanation with diagrams of different stages of Mitosis in plant and animal cells (Karyokinesis & its stages and Cytokinesis). Mention the difference between plant and animal mitosis based on the following features: (i) Formation of spindle fiber; (ii) Process of cytokinesis; Mention the significance of mitosis-growth, cell replacement & repair (eg. skin), regeneration (eg. legs in crustacean and arms in starfish), reproduction. Brief introduction of homologous chromosomes, sister and non-sister chromatid. A brief explanation of the following features of meiosis with the help of relevant diagrams: Separation of homologous chromosomes in Meiosis I as opposed to the separation of chromatids in Mitosis; separation of chromatids in Meiosis II (just like Mitosis); Reduction in chromosome number; Crossing over (exchange or segments between non-sister chromatids of homologous chromosomes). (The stages of meiosis are not mentioned.) The significance of meiosis is to be mentioned (maintenance of constant chromosome number of a species, producing variation in organisms, formation of gametes, alternation of generation). The basic differences between mitosis and meiosis are to be mentioned in tabular form based on the following features – (i) site of occurence; (ii) nature of division of chromosomes (equational as opposed to reductional); (iii) number of cells produced.

Chapter 2B Reproduction:
Discussions should include the following along with relevant examples: Reproduction is the production of a new generation of individuals of the same species. It is one of the fundamental characteristics of living organisms. Reproduction is not necessary to maintain the life of an individual organism, unlike essential life processes like nutrition, respiration, or exertion. But reproduction is essential for the continuation of species. A brief explanation of the modes of reproduction with one or two examples of each – Asexual and sexual. Difference between asexual and sexual reproduction based on the following features: (i) Number of parents; (ii) Production of gametes; (iii) Dependence on mitosis or meiosis; (iv) Nature of offspring. Only the types are to be mentioned with examples and diagrams in tabular form. Detailed process not to be mentioned. Fission (Amoeba and Plasmodium), budding (Yeast and Hydra), fragmentation (Spirogyra), spore formation (Bryophyta, Pteridophyta, Fungi), and regeneration (Planaria). A brief explanation of vegetative propagation with diagrams and one example of each type. Detailed process not to be mentioned. Types of vegetative propagation (brief explanation with one example of each): Natural – Root: Fleshy root (Sweet potato); Stem; Offset (Water hyacinth); Leaf: Adventitious bud (Bryophyllum). Artificial – Cutting, Grafting, and Micropropagation. Discussion on micropropagation should include only the following: ‘Micro’ refers to the small size of the material used, usually isolated cells or small pieces of tissue. The material is grown in special culture solutions (with added nutrients and plant hormones, particularly auxins and cytokinins), so the process is also known as tissue culture. Basically, it is the propagation of plants by tissue culture. This process ensures rapid propagation of desired varieties of plants. Brief explanation with a schematic diagram of alternation of generation with one example from germ. Discussions should include the following with relevant diagrams: (i) Different parts of a flower – sepals, petals, stamens, and carpels; (ii) Stamens and carpels – the reproductive parts of a flower containing germ cells; (iii) Stamen – male reproductive part; produces pollen grains of yellowish colour; (iv) Carpel – female reproductive part; consists of stigma, style, and ovary; ovary contains ovules and each ovule has an egg cell. A brief explanation of pollination and its types (self and cross-pollination) with examples and diagrams. Merits and demerits of self and cross-pollination in tabular form are to be mentioned based on the following – (i) the necessity of agents and (ii) the emergence of new characters in the offspring. A brief explanation of agents of pollination with one common example of each in tabular form – air (paddy), water (hydrilla), insect (mango), and bird (shimul). Discussions should include the following with relevant diagrams: Pollen grains transferred from the stamen to the stigma – male germ cells produced by pollen grain fuses with female gamete present in ovule – fusion of germ cells (fertilization) – zygote – divides several times to form embryo within the ovule – ovule gradually converts into seed and the ovary grows and ripens to form a fruit – seed contains future plant or embryo which develops into a seeding under appropriate conditions (Double fertilization and development of endosperm not to be mentioned). Discussions should include the following with relevant diagrams: Growth is a fundamental characteristic of all living organisms. The growth of an organism consists of a permanent and more or less irreversible increase in size and shape, commonly accompanied by an increase in solid matter, dry mass, and amount of cytoplasm. It is basically an irreversible increase in dry mass of living material. The development could be described as an increase in complexity. Starting with an individual cell, the growth of a multicellular organism can be divided into three phases – (i) Cell division – an increase in cell number as a result of mitosis and cell division; (ii) Cell enlargement – and irreversible increase in cell size as a result of uptake of water or the synthesis of living material; (iii) Cell differentiation – the specialization of cells; in its broad sense, the growth also includes this phase of cell development. Briefly mention the five phases of human development namely infancy, childhood, adolescence, adulthood, and senescence or late adulthood.

Chapter 3 Heredity and Common Genetic Disease

Chapter 3A Heredity:
Discussions should include the following with relevant examples: Members of a family share many similarities in appearance, such as height, eye color, and hair colour. People may also note that there are differences in the manner in which characteristics are inherited by offspring. Offsprings do not look exactly like their parents. An Austrian monk, Gregor Johann Mendel performed a series of simple experiments and discovered how heredity worked. Heredity is the transmission of characteristics or traits from one generation to another through reproduction. Sometimes alteration may occur in chromosome structure or number or there may be an alteration in a gene due to a change in DNA composition. This phenomenon is termed mutation. This permanent change in chromosome or DNA may result in a difference in the expression of characters, termed variation. A brief explanation of variation with suitable examples from human-free and attached ear lobe, roller, and normal tongue. Explain key terms associated with heredity with proper examples – (i) Characteristics or traits, (ii) Allele, (iii) Locus, (iv) Unit of inheritance (Factor/Gene), (v) Monohybrid and dihybrid Cross, (vi) Homozygous and heterozygous organisms, (vii) Hybridization, (viii) Pure and hybrid, (ix) Parental generation, (x) Filial generations (F,, F ), (xi) Dominant and recessive characteristics, (xii) Phenotype and genotype (Explain through sample cross). Mendel’s work on the pea plant is to be mentioned. Explanation of cross-pollination as practiced by Mendel (eg. removing another from a flower of a plant and transferring pollen grains from a flower of another plant to that flower with the help of a brush) with the help of proper diagrams. Reasons behind Mendel’s success to be mentioned. The seven pairs of contrasting characters as chosen by Mendel to be mentioned in tabular form with diagrams. Explanation of Mendel’s experiments on Heredity (Monohybrid and Dihybrid Cross) with examples from Pea plant and Guineapig using checkerboard. Explaining deduction of Mendel’s Laws (Law of Segregation and Law of Independent Assortment) with reference to pea plant and guineapig. A brief explanation of incomplete dominance using the four O’Clock (Mirabilis jalapa) flower as an example. A brief explanation of the Process of sex determination in man with special emphasis on the role of the father in determining the sex of the offspring.

Chapter 3B Some Common Genetic Diseases in Population:
Symptoms and causes (autosome/sex chromosome) of thalassemia, hemophilia, and colour blindness are to be mentioned briefly. Discussions should include the following, Thalassemia is a type of genetic disorder where haemoglobin is produced in decreased amounts. The decreased amount of haemoglobin in the blood causes anemia, which reduces the oxygen-carrying capacity of the blood. It also results in iron overload, either from the disease itself or from frequent blood transfusions. Iron overload may cause damage to the heart, liver, and endocrine system. The damage is characterized by excessive deposits of iron. Mention the role of genetic counseling in preventing thalassemia before marriage in families that carry the thalassemia trait.

Chapter 4 Evolution and Adaptation

Chapter 4A Evolution:
Discussions should include the following with relevant examples. The word evolution means change of life forms over a period of time. It is the central most important idea in biology that complex living organisms evolved from relatively simple ones. Evolution is the cause of biodiversity on earth. Brief outline of the chemical origin of life mentioning Miller and Urey’s experiment. Following evolutionary events to be mentioned with the help of schematic diagram (Not to be elaborated and time frame not to be mentioned): Formation of earth – origin of life – the origin of unicellular life – photosynthetic bacteria begin to release oxygen into the atmosphere – origin of multicellular organisms – fish-like vertebrates evolve land plants evolve, drastically changing earth’s landscape and creating new habitats – four-limbed vertebrates move on to the land. Lamerckism and Darwinism as put forward by Lamarck and Darwin respectively, to be explained with examples. Brief explanation of the evidence of evolution with examples and diagrams: Paleontological: Fossil history of Horse – increase in size, lengthening of limbs and feet, reduction of lateral digits, increase in length and thickness of the third digit; Comparative anatomy (examples to be mentioned): (i) Analogous and Homologous structures – convergent and divergent evolution to be mentioned; (ii) Vestigial organs; (iii) Structure of vertebrate heart (Fish, am-phibia, reptile, bird and mammal). Comparative embryology – At comparable stages of development, the vertebrate embryos all possess the following- external branchial grooves (visceral clefts) in the pharyngeal region and a series of internal paired gill pouches, segmental myotomes (muscle blocks) evident in the rail-like structure.

Chapter 4B Survival Strategies:
Adaptation: Discussions should include the following; A behaviour is an action carried out by an organism under the control of the nervous system in response to environmental cues or to the actions performed by an organism. A cue may be an odor, sound, or visual! signal. Put more simply, behaviour is what an animal does. Behavior allows animals to survive and reproduce and is, thus, critical to the evolutionary process. Adaptation is a modification in the form, physiological functioning or behavior of an organism over generations in response to environmental change in order to survive and reproduce in a particular environment. Adaptive character or adaptation evolves in a population of organisms by the process of natural selection. Brief mention of following adaptive features: (i) Morphological – Cactus (Conversion of leaf into spine or reduction in the number of Leaf); swim bladder of fish and air sac of bird; (ii) Physiological – Mechanism of salt adaptation in Sundri; Camel’s ability to withstand extreme water loss and the shape of RBC in Camel, (iii) Behavioural (Mention the following survival strategies with diagrams. Not to be elaborated further): Problem-solving in Chimpanzees: Chimpanzees pull leaves of a tree branch and then stick the branch into the entrance of a termite nest to “fish” for food. They also crack open nuts using pieces of wood in a “hammer and anvil” technique. They are even observed to eat the leaves of medicinal plants when infected with certain parasites. Communication in Honeybees: Honeybees go out to locate food sources. A honeybee returns to the hive after successfully locating a source of food, she performs the set of maneuvers on a honeycomb that resembles a figure 8 while waggling her abdomen. Based on the way she is dancing and the duration of her dance, other bees are able to leave the hive and quickly locate the food source.

Chapter 5 Environment, Its Resources and Their Conservation

Chapter 5A Nitrogen Cycle:
Discussions should include the following with relevant diagrams: Stages of the nitrogen cycle: (i) Nitrogen Fixation: Atmospheric, biological, and industrial (ii) Ammonification(iii) Nitrification (iv) Denitrification. Discussion should include the following: Human activities such as the use of fertilizers greatly increase the amount of nitrogen that is cycling between the living world and the soil, water, and atmosphere. This may result in Increased global concentrations of nitrous oxide (N2O), a potent greenhouse gas, in the atmosphere as well as increased regional concentrations of other oxides of nitrogen (including nitric oxide, NO) that may cause air pollution; Substantial acidification of soils and of the waters of streams and lakes in several regions.

Chapter 5B Environmental Pollution:
Discussions should include the following with relevant examples: Pollution is an undesirable change in the physico-chemical and biological characteristics of the biosphere that has adverse effects on living organisms and the environment. Mention the causes and effects of Air, Water, Soil, and Noise pollution in tabular form: Air pollution – Cause: Greenhouse gases, SPM Effect: Acid rain and its consequences, Lung disease; Water pollution – Cause: Agricultural runoff, pathogenic organisms; Effect: Disease (cholera, typhoid, etc.), Eutrophication; Soil pollution – Cause: Pathogenic organisms, Chemicals (fertilizers, pesticides, herbicides, etc.); Effect: Effect on human (through direct contact with soil or via inhalation of soil contaminats), Biological magnification; Noise pollution – Cause: Vehicle, Industry; Effect: Effect on human (ear and heart), effect on animals.

Chapter 5C Environment and Human Population:
Problems to be mentioned: over-exploitation and depletion of natural resources, deforestation and loss of ecosystems, shrinking of agricultural land, shortage of fresh water, air and water pollution, changes in atmospheric condition and global warming, destruction of wetland and its consequences, scarcity of food. Discussions should include a brief explanation of the environmental causes behind Lung diseases and cancer. Lung diseases; Asthma – a condition in which breathing is difficult; environmental triggers for asthma include naturally occurring triggers such as animal dander, plant pollen, dust & mold and manmade triggers such as chemicals. Bronchitis – inflammation of the airways of the lungs, can be caused by breathing in of certain chemicals or smoke; welders, firefighters, and smokers are some of the people at risk. Cancer: Cancers have been linked to environmental toxins (poisons). Pesticides, herbicides, and radioactive substances have the potential to cause cancer. Smokers are at increased risk for developing lung cancer. Tobacco chewers are at increased risk of developing oral cancer.

Chapter 5D Biodiversity and Conservation:
Explanation of biodiversity and its importance (with relevant diagrams and pictures) namely in producing food, drugs & medicines, maintenance of ecological balance, climate control, economic importance (construction of the house and household furniture, production of paper, gum, resin, wax, leather, silk, wool, pearl etc.), influence on art and literature. Discussions should include the following: Four of the 34 globally identified biodiversity hotspots are in India. These hotspots are the Eastern Himalayas, Indo-Burma, Western Ghats, and Srilanka, Sundaland. The reasons behind the loss of biodiversity to be mentioned (with relevant examples pictures and diagrams) – the destruction of habitat due to changes in land use patterns, hunting and poaching, global warming and climate change, pollution, over-exploitation, natural calamities, the introduction of exotic species. The following factors are to be mentioned: Destruction of mangroves due to urbanization, agriculture, freshwater crisis, destruction of habitat, pollution, disbalance in prey-predator number, and submergence of islands due to rising sea level. Brief explanation of the terms – in-situ and ex-situ conservation, in-situ Conservation – National park, sanctuary, Reserve Forest, and Biosphere Reserve. [One or two characteristics with two examples of each type (one from West Bengal and one from the rest of India) in tabular form] ex-situ Conservation – Zoological Garden, Botanical Garden, and Cryopreservation. (Mention two characteristics with relevant examples for each). Discussions should include the following: Joint Forest Management (JFM): It was instituted by the Government of India. The pioneer project started in West Bengal in 1971 for the restoration and management of degraded Sal forests by the local inhabitants of the Arabari forest in the district of West Midnapore in West Bengal. It was initiated to meet the demands of the people and save forests from destruction. It involves the participation of common people in the protection and management of forests. People’s Biodiversity Register (PBR): It is a documented register prepared with the involvement of local people containing comprehensive information on the availability and knowledge of the local biological resource, their use, and the traditional folklore knowledge associated with them. Mention briefly with pictures of the conservation efforts of Tigers, Rhinoceros, Lions, Crocodile and Red Panda in India. Mention the name and place of one of the projects undertaken for each of their conservation.

First Summative Evaluation: 40
Month of Evaluation: April
Internal Formative Evaluation: 10

  • Chapter 1 Control and Coordination in living organisms
  • Chapter 2 Continuity of Life
    • Chapter 2A Cell Division and Cell Cycle

Second Summative Evaluation: 40
Month of Evaluation: August
Internal Formative Evaluation: 10

  • Chapter 2 Continuity of Life
    • Chapter 2B Reproduction
    • Chapter 2C Sexual Reproduction in Flowering Plants
    • Chapter 2D Growth and Development
  • Chapter 3 Heredity and Some Common Genetic Diseases
  • Chapter 4 Evolution and Adaptation

Third Summative Evaluation: 90
Month of Evaluation: December
Internal Formative Evaluation: 10

  • Chapter 5 Environment, Its Resources and Their Conservation

Note: Along with this theme, 4 themes from the first and second summative evaluations are to be included.

WBBSE Class 10 Life Science Blueprint for 1st Summative Evaluation (Total Marks – 40)

Theme Group A Group B Group C Group D Total Marks Total Questions
MCQ
1 Mark		 VSAQ
1 Mark		 SAQ
2 Marks		 LAQ
5 Marks
Chapter 1 1 × 5 = 5 1 × 5 = 5 2 × 3 = 6 5 × 2 = 10 26 15
Chapter 2A 1 × 3 = 3 1 × 4 = 4 2 × 1 = 2 5 × 1 = 5 14 9
Total 8 9 8 15 40 24

Group A – MCQ: All questions are compulsory. There will be no alternative for MCQ.
Group B – VSA: Out of 11 questions, 9 questions are to be attempted. One (1) extra question is to be set from each theme. VSA questions may be of four types – answer in one word or in one sentence, fill in the blanks, true/false, and match column A with column B. In column matching two points are to be kept in mind – (i) For each correct matching one (1) mark is allotted, (ii) There should be at least one (1) extra option in Column B.
Group C – SA: Out of 6 questions, 4 questions are to be attempted. One (1) extra question is to be set from each theme.
Group D – LA: 3 questions are to be attempted. Alternative question from the same theme is to be set for each question. 5 marks can be given as a whole or can be divided into 3 + 2 or 2 + 3.

WBBSE Class 10 Life Science Blueprint for 2nd Summative Evaluation (Total Marks – 40)

Theme Group A Group B Group C Group D Total Marks Total Questions
MCQ
1 Mark		 VSAQ
1 Mark		 SAQ
2 Marks		 LAQ
5 Marks
Chapter 2B,2C,2D 1 × 3 = 3 1 × 2 = 2 2 × 1 = 2 5 × 1 = 5 12 7
Chapter 3 1 × 3 = 3 1 × 2 = 2 2 × 2 = 4 5 × 1 = 5 14 8
Chapter 4 1 × 3 = 3 1 × 2 = 2 2 × 2 = 4 5 × 1 = 5 14 8
Total 9 6 10 15 40 23

Group A – MCQ: All questions are compulsory. There will be no alternative for MCQ.
Group B – VSA: Out of 9 questions, 6 questions are to be attempted. One (1) extra question is to be set from each theme. VSA questions may be of four types – answer in one word or in one sentence, fill in the blanks, true/false, and match column A with column B. In column matching two points are to be kept in mind – (i) For each correct matching one (1) mark is allotted, (ii) There should be at least one (1) extra option in Column B.
Group C – SA: Out of 8 questions, 5 questions are to be attempted. One (1) extra question is to be set from each theme.
Group D – LA: 3 questions are to be attempted. Alternative question from the same theme is to be set for each question. 5 marks can be given as a whole or can be divided into 3 + 2 or 2 + 3.

WBBSE Class 10 Life Science Blueprint for 3rd Summative Evaluation (Total Marks – 90)

Theme Group A Group B Group C Group D Total Marks Total Questions
MCQ
1 Mark		 VSAQ
1 Mark		 SAQ
2 Marks		 LAQ
5 Marks
Chapter 1 1 × 3 = 3 1 × 5 = 5 2 × 3 = 6 5 × 1 = 5 19 12
Chapter 2 1 × 3 = 3 1 × 5 = 5 2 × 2 = 4 5 × 1 = 5 17 11
Chapter 3 1 × 3 = 3 1 × 3 = 3 2 × 2 = 4 5 × 1 = 5 15 9
Chapter 4 1 × 3 = 3 1 × 3 = 3 2 × 2 = 4 5 × 1 = 5 15 9
Chapter 5 1 × 3 = 3 1 × 5 = 5 2 × 3 = 6 5 × 2 = 10 24 13
Total 15 21 24 30 90 54

Group A – MCQ: All questions are compulsory. There will be no alternative for MCQ.
Group B – VSA: Out of 26 questions, 21 questions are to be attempted. One (1) extra question is to be set from each theme. VSA questions may be of four types – answer in one word or in one sentence, fill in the blanks, true/false, and match column A with column B. In column matching two points are to be kept in mind – (i) For each correct matching one (1) mark is allotted, (ii) There should be at least one (1) extra option in Column B.
Group C – SA: Out of 17 questions, 12 questions are to be attempted. One (1) extra question is to be set from each theme.
Group D – LA: 6 questions are to be attempted. Alternative question from the same theme is to be set for each question. 5 marks can be given as a whole or can be divided into 3 + 2 or 2 + 3.
The question pattern is indicative of the Madhyamik Examination.

WBBSE Class 10 Solutions

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