WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

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Well structured WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour can serve as a valuable review tool before exams.

Biomolecules and their Behaviour Class 9 WBBSE MCQ Questions

Multiple Choice Questions & Answers

Question 1.
Existence of life depends upon………………….
A. Water
B. Mineral salts
C. Organic molecules
D. All of these
Answer:
D. All of these

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 2.
Life forms on earth are composed of various………………….
A. Minerals
B. Organic matters
C. Chemical substances
D. Salts and water
Answer:
C. Chemical substances

Question 3.
Most abundant elements of a living body are………………….
A. Carbon, water and oxygen
B. Carbon and nitrogen
C. Water
D. Oxygen, hydrogen, carbon and nitrogen
Answer:
D. Oxygen, hydrogen, carbon and nitrogen

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 4.
Medium of transportation in plants is………………….
A. Water
B. Phloem
C. Xylem
D. Both A. and B.
Answer:
A. Water

Question 5.
HCl in stomach helps in the digestion of………………….
A. Protein
B. Lactose
C. Maltose
D. Fructose
Answer:
A. Protein

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 6.
Acidic chyme of stomach is neutralised by………………….
A. Bile salt
B. Sodium bicarbonate
C. NaOH
D. KOH
Answer:
B. Sodium bicarbonate

Question 7.
Percentage of mineral salts present in cellular components is………………….
A. 10-30%
B. 1-3%
C. 0.1-0.3%
D. 0.01-0.03%
Answer:
B. 1-3%

Question 8.
A biomicromolecule is………………….
A. Glucose
B. Peptide
C. Lipid
D. Protein
Answer:
A. Glucose

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 9.
The main energy generating biomolecule is………………….
A. Protein
B. Carbohydrate
C. Fat
D. Vitamin
Answer:
B. Carbohydrate

Question 10.
A simple carbohydrate molecule present in glycogen is………………….
A. Glucose
B. Fructose
C. Lactose
D. Galactose
Answer:
A. Glucose

Question 11.
The sugar present in milk is………………….
A. Sucrose
B. Maltose
C. Glucose
D. Lactose
Answer:
D. Lactose

Question 12.
Which of the following is not a disaccharide?
A. Lactose
B. Fructose
C. Sucrose
D. Maltose
Answer:
B. Fructose

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 13.
A polypeptide is composed of many………………….
A. Monosaccharides
B. Proteins
C. Fatty acids
D. Amino acids
Answer:
D. Amino acids

Question 14.
Peptide bonds bind two………………….
A. Fatty acids
B. Amino acids
C. Monosaccharides
D. Proteins
Answer:
B. Amino acids

Question 15.
Nucleic acids are………………….
A. Polymers and amino acids
B. Present only in nucleus
C. Composed of many nucleotides
D. Composed of nucleoproteins
Answer:
C. Composed of many nucleotides

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 16.
An oligosaccharide molecule is composed of ………………….
A. 1-2 monosaccharides
B. 3-9 monosaccharides
C. Many monosaccharides
D. None of these
Answer:
B. 3-9 monosaccharides

Question 17.
The main component of plant cell wall is………………….
A. Cellulose
B. Glycogen
C. Glucose
D. Lipid and protein
Answer:
A. Cellulose

Question 18.
Starch molecule is formed by………………….
A. Glucose
B. Maltose
C. Galactose
D. Lactose
Answer:
A. Glucose

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 19.
Chemical name of common table sugar is………………….
A. Glucose
B. Fructose
C. Sucrose
D. Starch
Answer:
C. Sucrose

Question 20.
The main sugar present in honey is ………………….
A. Glucose
B. Fructose
C. Sucrose
D. Maltose
Answer:
B. Fructose

Question 21.
Which of the following carbohydrates is not digested in human intestine?
A. Glycogen
B. Cellulose
C. Maltose
D. Inulin
Answer:
B. Cellulose

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 22.
The walls of xylem become rigid by………………….
A. Glycogen
B. Chitin
C. Cellulose
D. Lignin
Answer:
D. Lignin

Question 23.
The main component of fungal cell wall is………………….
A. Inulin
B. Chitin
C. Cellulose
D. Pectin
Answer:
B. Chitin

Question 24.
Which of the following is known as animal starch?
A. Glucose
B. Cellulose
C. Inulin
D. Glycogen
Answer:
D. Glycogen

Question 25.
Besides amino group, the other functional group present in an amino acid is………………….
A. Hydroxyl group
B. Carboxyl group
C. Aldehyde group
D. Ketone group
Answer:
B. Carboxyl group

Question 26.
Glycogen and starch are………………….
A. Monosaccharides
B. Disaccharides
C. Oligosaccharides
D. Polysaccharides
Answer:
D. Polysaccharides

WBBSE Class 9 Life Science MCQ Questions Chapter 2.1 Biomolecules and their Behaviour

Question 27.
Glucose and fructose are………………….
A. Monosaccharides
B. Disaccharides
C. Oligosaccharides
D. Polysaccharides
Answer:
A. Monosaccharides

Question 28.
Which are disaccharides?
A. Glucose and maltose
B. Sucrose and maltose
C. Sucrose and fructose
D. All of these
Answer:
B. Sucrose and maltose

Question 29.
The sugar present in sugarcane juice is ………………….
A. Fructose
B. Glucose
C. Maltose
D. Sucrose
Answer:
D. Sucrose

Question 30.
Structural component of a simple protein molecule is………………….
A. Peptide
B. Peptone
C. Amino acid
D. Nucleic acid
Answer:
C. Amino acid

Question 31.
Which of the following compounds is essentially a protein structure?
A. Hormone
B. Enzyme
C. Co-enzyme
D. Prostaglandin
Answer:
B. Enzyme

Question 32.
The two radicals of a protein molecule are………………….
A. Amino and ketone
B. Amino and carboxyl
C. Carboxyl and aldehyde
D. Aldehyde and ketone
Answer:
B. Amino and carboxyl

Question 33.
Which is not a conjugated protein?
A. Proteose
B. Nucleoprotein
C. Metalloprotein
D. Glycoprotein
Answer:
A. Proteose

Question 34.
Haemoglobin is a………………….
A. Simple protein
B. Conjugated protein
C. Derived protein
D. Colloidal protein
Answer:
B. Conjugated protein

Question 35.
Chromosome is a………………….
A. Combination of many nucleotides
B. Nucleoprotein substance
C. Combination of many proteins
D. Combination of proteins and lipids
Answer:
B. Nucleoprotein substance

Question 36.
Cell membrane is composed of………………….
A. Proteins and lipids
B. Proteins and polysaccharides
C. Proteins, lipids and carbohydrates
D. All of these
Answer:
C. Proteins, lipids and carbohydrates

Question 37.
An essential component of lipid is………………….
A. Nucleic acid
B. Malic acid
C. Fatty acid
D. Amino acid
Answer:
C. Fatty acid

Question 38.
Wax belongs to………………….
A. Carbohydrates
B. Lipids
C. Glycoproteins
D. Lipoproteins
Answer:
B. Lipids

Question 39.
Which of the following is a simple protein?
A. Haemoglobin
B. Nucleoprotein
C. Glycoprotein
D. Globulin
Answer:
D. Globulin

Question 40.
Which of the following is not a fibrous protein?
A. Collagen
B. Haemoglobin
C. Keratin
D. Elastin
Answer:
B. Haemoglobin

Question 41.
Which is a chromoprotein?
A. Gleadin
B. Keratin
C. Haemoglobin
D. Elastin
Answer:
C. Haemoglobin

Question 42.
Which has close association with fibrous protein?
A. Centrosome
B. Golgi body
C. Endoplasmic reticulum
D. Mitochondria
Answer:
A. Centrosome

Question 43.
Each fatty acid has a hydrocarbon chain ending with………………….
A. Hydroxyl group
B. Aldehyde group
C. Ketone group
D. Carboxyl group
Answer:
D. Carboxyl group

Question 44.
Which of the following combinations of vitamins are fat soluble?
A. Vit. A, vit. B and vit. K
B. Vit. A, vit. B and vit. C
C. Vit. A, vit. D and vit. E
D. Vit. B, vit. C and vit. P
Answer:
C. Vit. A, vit. D and vit. E

Question 45.
DNA is a………………….
A. Single stranded chain of nucleotides
B. Double stranded chain of polypeptides
C. Double stranded chain of nucleotides
D. Double stranded chain of amino acids
Answer:
C. Double stranded chain of nucleotides

Question 46.
The nitrogenous base, absent in DNA is………………….
A. Adenine
B. Thymine
C. Uracil
D. All of these
Answer:
C. Uracil

Question 47.
Which combination includes all macroelements?
A. Calcium, magnesium and boron
B. Sodium, potassium and iodine
C. Sodium, molybdenum and iron
D. Potassium, calcium and phosphorus
Answer:
D. Potassium, calcium and phosphorus

Question 48.
A vitamin related to blood coagulation is………………….
A. Vit. A
B. Vit. E
C. Vit. D
D. Vit. K
Answer:
D. Vit. K

Question 49.
Which combination of vitamins and minerals is related to formation of bones and teeth?
A. Vit. A and phosphorus
B. Vit. D and calcium
C. Vit. C and calcium
D. Vit. D and sodium
Answer:
B. Vit. D and calcium

Question 50.
To get vitamin K, you will have to eat………………….
A. Guava
B. Lettuce
C. Butter
D. Tomato
Answer:
B. Lettuce

Question 51.
Pellagra is caused due to the deficiency of………………….
A. Vit. B2
B. Vit. B2
C. Vit. B1
D. Vit. B12
Answer:
B. Vit. B2

Question 52.
Contraction of muscie is concerned with………………….
A. Collagen
B. Myosin
C. Elastin
D. Keratin
Answer:
B. Myosin

Question 53.
Pernicious anaemia occurs due to deficiency of………………….
A. Vit. B6
B. Vit. B5
C. Vit. B3
D. Vit. B12
Answer:
D. Vit. B12

Question 54.
Number of amino acids taking part in protein synthesis is………………….
A. 10
B. 20
C. 30
D. 40
Answer:
B. 20

Question 55.
The non………………….protein component of a haemoglobin molecule is………………….
A. Magnesium
B. Calcium
C. Copper
D. Iron
Answer:
D. Iron

Question 56.
Which protein is found in our nails and hairs?
A. Keratin
B. Elastin
C. Collagen
D. Globulin
Answer:
A. Keratin

Question 57.
Sulphur………………….containing amino acid is………………….
A. Serine
B. Valine
C. Methionine
D. Isoleucine
Answer:
C. Methionine

Question 58.
An essential amino acid is………………….
A. Valine
B. Glutamic acid
C. Argenine
D. Glycine
Answer:
A. Valine

Question 59.
95 of total vitamin A absorbed in human body is stored in………………….
A. Kidney
B. Lungs
C. Liver
D. Stomach
Answer:
C. Liver

Question 60.
The bond present in protein molecules, is………………….
A. Covalent bond
B. Peptide bond
C. Electrovalent bond
D. Glycosidic bond
Answer:
B. Peptide bond

Question 61.
Which of the following carbohydrates is present in RNA?
A. Ribulose
B. De-oxyribose
C. Ribose
D. None of these
Answer:
C. Ribose

Question 62.
Lipid is an………………….
A. Acidic compound
B. Alcoholic compound
C. Ester
D. Aldehyde
Answer:
C. Ester

Question 63.
An essential fatty acid is………………….
A. Stearic acid
B. Oleic acid
C. Linolenic acid
D. All of these
Answer:
C. Linolenic acid

Question 64.
Simple structural formula of carbohydrate is………………….
A. Cn(H2O)n-1
B. (C6H10O5)n
C. (CH2O)n
D. R-COOH
Answer:
C. (CH2O)n

Question 65.
Simple structural formula of a lipid is………………….
A. C – ROOH
B. R-CHO
C. R-COOH
D. R=CO
Answer:
C. R-COOH

Question 66.
Simple structural formula of an amino acid is………………….
A. R – CHNH2 COOH
B. NH2-R=CO2
C. R-COOH
D. R-NH2
Answer:
A. R – CHNH2 COOH

Question 67.
An example of contractile protein is………………….
A. Keratin
B. Collagen
C. Haemoglobin
D. Elastin
Answer:
D. Elastin

Question 68.
One useful lipoprotein for human is………………….
A. LDL
B. HDL
C. VLDL
D. DL
Answer:
B. HDL

Question 69.
A hydrophobic amino acid is………………….
A. Leucine
B. Tyrosine
C. Histidine
D. Serine
Answer:
A. Leucine

Question 70.
Molecules of disaccharides are held together by………………….
A. Hydrogen bond
B. Peptide bond
C. Glycosidic bond
D. Nitrogen bond
Answer:
C. Glycosidic bond

Question 71.
The carbohydrate, which does not belong to the ketose group………………….
A. Erythrose
B. Fructose
C. Xylulose
D. Ribulose
Answer:
A. Erythrose

Question 72.
Sugar present in DNA molecule is composed of………………….
A. 6-Carbon
B. 5-Carbon
C. 4-Carbon
D. 1-Carbon
Answer:
B. 5-Carbon

Question 73.
Purines include………………….
A. Adenine and guanine
B. Thymine and cytosine
C. Thymine and adenine
D. Guanine and cytosine
Answer:
A. Adenine and guanine

Question 74.
In a DNA molecule, hydrogen bonding occurs between………………….
A. Adenine and guanine
B. Thymine and cytosine
C. Adenine and cytosine
D. Guanine and cytosine
Answer:
D. Guanine and cytosine

Question 75.
Nitrogenous base present in both DNA and RNA are………………….
A. Adenine, guanine, cytosine
B. Adenine, guanine, thymine
C. Adenine, thymine, uracil
D. Adenine, guanine, uracil
Answer:
A. Adenine, guanine, cytosine

Question 76.
Chlorosis in plants can be seen in deficiency of………………….
A. Calcium
B. Magnesium
C. Oxygen
D. Sodium
Answer:
B. Magnesium

Question 77.
Highest calorific value is seen in which of the following four nutrients?
A. Protein
B. Carbohydrate
C. Fat
D. Vitamin
Answer:
C. Fat

Question 78.
Name the vitamin that helps in developing immunity against common cough and cold.
A. Retinol
B. Pantothenic acid
C. Ascorbic acid
D. Calciferol
Answer:
C. Ascorbic acid

Question 79.
Which of the following food items should one take to prevent xerophthaimia?
A. Papaya
B. Pulses
C. Carrot
D. Beans
Answer:
C. Carrot

Question 80.
Which vitamin can reduce the chance of foetal death?
A. Vit. B12
B. Vit. E
C. Vit. K
D. Vit. B6
Answer:
B. Vit. E

Question 81.
Hydrolysis of sucrose produces………………….
A. Glucose + Galactose
B. Glucose + Fructose
C. Glucose + Glucose
D. Glucose + Mannose
Answer:
B. Glucose + Fructose

Question 82.
Which combination of elements is widely used in making fertilisers?
A. N, C, H
B. N, P, K
C. N, Fe, Mg
D. Mn, K,C
Answer:
B. N, P, K

Question 83.
A microelement helping in fixation and assimilation of nitrogen………………….
A. Molybdenum
B. Magnesium
C. Manganese
D. Potassium
Answer:
A. Molybdenum

Question 84.
The disease caused by deficiency of iodine is………………….
A. Night blindness
B. Beriberi
C. Goitre
D. Anaemia
Answer:
C. Goitre

Question 85.
The provitamin of vitamin A is………………….
A. Beta carotene
B. Retinol
C. Calciferol
D. Pyrithiamine
Answer:
A. Beta carotene

Question 86.
Contraction of muscles is controlled by………………….
A. Magnesium
B. Calcium
C. Phosphorus
D. Iron
Answer:
B. Calcium

Fill in the blanks:

1. Maltotriose is an example of …………… saccharide.
2. In the process of ……………, fats are hydrolised in presence of alkali to produce soap and glycerol.
3. In 1912, the term ‘vitamin’ was first coined by ……………
4. ‘Biotin’ was previously known as ……………
5. Calorific value of fat is …………… kcal / g.
6. The chemical name of vitamin K is ……………
7. In animals, fat is stored in …………… cell.
8. Name of the protein present in white part of egg is ……………
9. …………… is example of longest chain fatty acid.
10. The vitamin which helps in production of insulin is ……………
11. We get vitamin …………… from Streptomyces griseus.
12. Osteoporosis is caused due to deficiency of …………… in bones.
Answer:
1. Oligo
2. Saponification
3. Casimir Funk
4. Vitamin H
5. 9.3
6. Phylloquinone
7. Adipose
8. Albumin
9. Palmitic acid/Linoleic acid
10. Vitamin C/Ascorbic acid
11. B12
12. Calcium

State True or False

1. Glucose is a pentose sugar. — False
2. Cn(H2O)n-1 is the basic molecular formula of oligosaccharides. — True
3. Avitaminosis refers to a state of lacking vitamins. — True
4. Carbonic acid is involved in the transportation of carbon dioxide gas. — True
5. Chemical name of B12 is cyanocobalamin. — True
6. We may suffer from ketosis due to malnutrition of fat. — False
7. Roughage mainly consists of cellulose. — True
8. Disaccharides cannot be hydrolised further to their smaller units. — False
9. Cytosin is a non-nitrogenous base present in DNA. —
10. Vitamin C can be dissolved in water. — True
11. Non-histone proteins are basic in nature. — False
12. In presence of sunlight, vitamin-D is synthesised within human body. — True
13. Dissacharide maltose is present in jaggery. — True
14. Ratio of hydrogen and oxygen present in carbohydrate is 3: 1. — False

Match the columns

Left column Right column
1. PUFA A. Deficiency of vitamin A
2. Protein B. Omega 3-fatty acid
3. Phrynoderma C. Respiration
4. Pyruvic acid D. 4.1 kcal/g
E. Fatty acid

Answer:
1-8; 2-D; 3-A; 4-C

Left column Right column
1. Peptide bond A. Claws, horns
2. Keratin B. Carbohydrate
3. Glycosidic bond C. Protein
4. Ketohexose D. Lipid
E. Fructose

Answer:
1-C; 2-A; 3-B; 4-E

Left column Right column
1. Hibernation A. Heating of protein molecule
2, Rancidity B. Animal cellulose
3. Tunicin C. Fat provides energy
4. Denaturation D. Solidified ester
E. Bad odour from old fat

Answer:
1-C; 2-E; 3-B; 4-A

Left column Right column
1. Scurvy A. Osmoregulation
2. Salt B. Cholesterol
3. Manganese C. Vitamin C
4. Egg yolk D. Inuiln
E. Microelement

Answer:
1-C; 2-A; 3-E; 4-B

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