Detailed explanations in West Bengal Board Class 7 Science Book Solutions Chapter 5 Human Food offer valuable context and analysis.
WBBSE Class 7 Science Chapter 5 Question Answer – Human Food
(Page no. 145)
Let’s make a list of our daily work from the following pictures.
(Page no. 147)
So, what kinds of food (plant/animal) do we eat? Which food component is less or excess in these food items? Discuss with your teachers and fill up the following chart from the discussions later on.
(Page no. 148)
Let’s make a chart showing food components present in different common foods. Take help from your teacher to fill up the following chart.
|Food Source||Main Food elements|
|1. Rice, roti, milk, fruit, potato, sweet potato, honey, sugar, jaggery||Carbohydrate|
|2. Fish, meat, egg, milk, pulses, cheese, soyabean||Protein|
|3. Butter, ghee, coconut, groundnut, oil, animal fat. milk, fish||Lipid|
|4. Drinking water, fruits, vegetables, tea, milk, cooked food||Water|
|5. Tomato, amla, whole wheat grain, carrot, green vegetables, fruits||Vitamin|
|6. milk, salt, rice, molasseo, meat, leafy vegetables, milk, fish, pulses||Mineral|
|7. Mango, apple, oat, papaya, leafy vegetables, whole grains, pulses||Food fibre|
|8. Tea, ripe mango, ripe papaya, beet, pomegranate, watermelon||Phytochemical.|
Page no. 150
Apart from the food items mentioned on the previous page some more are mentioned in the table below. Ask your teacher to know whether these contain carbohydrates or not.
|1. Pumpkin||Present: 7gr./100gr.|
|2. Raisin .||Present : 79gr./100gr.|
|3. Custard-apple||Present: 24gr./100gr.|
|4. Berry||Present: 14gr./100gr.|
|5- Egg||Present: 1.1 gr./100gr.|
|6. Cumin||Present: 44gr./100gr.|
|7. Curd||Present: 3.4gr./100gr.|
|8. Cake||Present: 59gr./100gr.|
|9. Ghee||Absent: 0gr./100gr.|
|10. Flattened rice||Present: 40gr./100gr.|
(Page no. 152)
Apart from the food items mentioned above, some more mentioned in the table below. Ask your teacher to know whether these contain protein or not.
|1. Rice/wheat||Present: 2.7gr./100gr, 12.61 gr./ 100gr.|
|2. Ghee||Absent: 0.3 8gr./100gr.|
|3. Groundnut||Present: 26gr./100gr.|
|4. Sesame||Present: 18gr./100gr.|
|5. Banana||Present: 1.1 gr./100gr.|
|6. Mushroom||Present: 3.1 gr./100gr.|
|7. Suji||Present: 13gr./100gr.|
|8. Ant eggs||Present: 8.2gr./100gr.|
(Page no. 153)
Try to find out if lipid is present in the food mentioned in the table below.
|Food / Drink||Present/Absent|
|1. Fruits and vegetables||Absent|
|6. Sugarcane juice||Absent|
|8. Wheat, mazie, rice||Absent|
(Page no. 161)
Put the name of food components and their sources in the following table.
|1. Sugar||Rice, wheat, Bazra, potato, beat, carrot, sugar.|
|2. Protein||Fish, meat. egg. milk, pulse, soyabean, peas.|
|3. Lipid||Nut. coconut, ghee, butter, oil, fish, fat of meat.|
|4. Vitamin||Capsicum, tomato, green vegetables, gram, milk|
|5. Minerals||Green vegetables, food grain, soyabean, fish, meat, egg.|
|6. Water||All types of rinking water, fruit juice, coconut water|
|7. Fibre||Cereal, apple, oat, papaya, broccoli, figs, berries.|
|8. Plant chemical||Tea, cabbage, carrot, tomato, ripe mango|
(Page no. 161)
Some physiological problems are mentioned. Which foods are required to prevent these health problems?
|Problems||Which food should you have||Which food component will you get|
|Swollen gums with bleeding||Sour fruits, amla, lemon, guava||Vitamin C|
|Anaemic condition||Egg. milk, banana, guava||Vitamin B-complex|
|Weak and curved bones||Egg, milk, butter, cod liver oil||Vitamin-D|
|Constipation||Vegetables, cabbage, guava||Fibre|
|Short sight at night||Vegetables, milk, carrot, tomato||Vitamin-A|
|Ulcer in mouty and tongue||Egg, milk, spinach.||Vitamin B-complex|
|Wrinkled skin||Carrot, letus. egg, milk, raddish||Vitamin-A|
|Sudden rise in blood pressure||Small fish, vegetables, fruits||Sodium|
(Page no. 162)
There are a few names of food. Try to find out which food components can you get from them. Take help from your teacher, if necessary.
- Ripe mango : Food fibre, sugar, vitamin
- Milk: Protein, vitamin, lipid, minerals
- Nuts : Lipid, vitamin, carbohidrate
- Egg : Protein, vitamin, lipid, minerals
- Guava : Vitamin, minerals, sugar
- Gurd : Vitamin, minerals, sugar
- Tomato : Vitamin, plant chemicals
- Rice : Carbohidrate, vitamin
- Spinach : Vitamin, minerals, foodfibre
- Amla : Vitamin, minerals
(Page no. 166)
Following symptoms develop due to defficiency of different food components. Write down the names of food items that can prevent these diseases.
|Symptoms||Defficiencyof food component||Somponents are found in|
|Bent limbs||Vitamin D||Milk, egg, butter, fish|
|White spot in iris||Vitamin A||Carrot, egg, milk, curd, letus|
|Can’t read blackboard||Vitamin A||Carrot, egg, milk, curd, letus|
|Ulcer on tongue, nouth||Vitamin B Complex||Vegetable, cabbage, milk, green chilli|
|Swollen face||Protein||Milk, fish, meat, panir, soyabean|
|Broken nails||Calcium||Milk, amla, lemon, guava|
|Rough skin||Vitamin A||Carrot, egg, milk, curd, letus|
(Page no. 166)
Weight and height of some children and adults are mentioned below. Calculate BMI from it.
|66||1.50||29.33||yes||high blood pressure, asthma|
|72||1.59||28.47||yes||(respiratory problem, diabetes|
|75||1.60||29.29||yes||high blood pressure, asthma|
|71||1.58||28.44||yes||knee pain, asthma|
Class 7 Science Chapter 5 Question Answer West Bengal Board – Human Food
Multiple Choice Questions & Answers : (1 mark for each question)
Which is known as instant source of energy ……………………….
Dificiency of iron in our diet casues ……………………….
Plants manufacture food in the form of ……………………….
What helps in removing wastes from the body ……………………….
Starch is a complex ……………………….
Daily requirement of carbohydrate by an adult is ……………………….
i) 500 gram
ii) 300 gram
iii) 600 gram
iv) 100 gram
i) 500 gram
Marasmus is due to the deficiency of ……………………….
i) vitamin C
To get sufficient carbohydrate one should take ……………………….
iv) ground nut
What one of the following is the best source of vitamin-A?
iv) pea nut
Fat soluble vitamins are ……………………….
i) A D E and K
ii) B C and D
iii) D B and E
iv) A B and C
i) A D E and K.
Vitamin essential for blood clotting is ……………………….
iv) K .
Which one is body-building material?
Scurvy disease causes in deficiency of vitamin ……………………….
Artificial chemical Ajinamoto is used to make ……………………….
Trans-fat is present in ……………………….
ii) potato chips
ii) potato chips
Fill in the blanks : (1 mark for each question)
1. ………….. provides us energy for all life activites.
2. Food keeps us healthy and enables us to fight against …………..
3. In the process of digestion starch a ………….. is broken down into the smallest unit (Glucose).
4. Energy is produced in the cells of the healthy body by break down of …………..
5. ………….. is caused due to the lack of food fibre in our diet.
6. The protein that is present in hair and nail is ……………
7. The protein present in blood is …………..
8. ………….. has important role in providing immunity.
9. ………….. help in coagulation of blood oozing out continuously from any wounded region.
10. ………….. reduces heat emission from human body.
11. Vitamins A D E and K are …………..
12. B-complex and C vitamins are ………….. vitamins.
13. Vitamin ………….. helps to maintain the structure of eye skin bones and teeth.
14. Vitamin …………… maintains the structure of bones and joints.
15. Deficeincy of iron causes ……………
16. …………… controls mental abilities and mental growth.
17. Deficiency of …………… causes increase in blood sugar level.
18. The …………… part of food comes out of the body as stool.
19. Excessive water loss from the body causes ……………
20. Deficiency of proteins lipids and carbohydrates in the diet casues …………..
21. Protein malnutrition results in a disease called …………..
22. The kitchen of plant is …………..
State whether True or False : (1 mark for each question)
1. High blood pressure is related with iodine.
2. Iodine controls mental abilities and mental growth.
3. Sodium maintains water level in body.
4. Source of iodine is vegetables.
5. Iron helps in transporting oxygen in tissues.
6. Plant source of lipid is fish oil..
7. Keratin is present in hair and nail.
8. Collagen is present in tendon and ligament.
9. Protein is the main food component of ground nut butter coconut.
10. Deficiency of vitamin causes ulcer at the corner of lips.
11. Due tr deficiency of iodine symptom of high blood pressure is seen.
12. For deficiency of vitamin A.one can not read blackboard from the last bench.
13. Processed foods are richest in nutritional value.
14. The foods obtained directly from mature are called natural foods.
15. About 75% of earth’s surface is covered by water.
Match the column A with column B
|Column A||Column B|
|a) Aquatic plants absorb water||i) 60% water by mass|
|b) High fever occurs in||ii) is the cause of blindness|
|c) Human body has||iii) which can not be digested|
|d) Natural foods are richest||iv) from plants or animals or from water|
|e) Deficiency of Vitamin A||v) with their whole body|
|f) We get phytochemicals||vi) Malaria or Pneumonia|
|g) Stool has fibres||vii)root and other parts|
|h) Plant absorb water through||viii) in nutritional value|
|i) Deficiency of iodine||ix) from tomato ‘|
|j) Animals get minerals .||x) causes goitre|
a) Aquatic plants absorb water with their whole body.
b) High fever occurs in Malaria or Pneumonia.
c) Human body has 60% water by mass.
d) Natural foods are richest in nutritional value.
e) Deficiency of Vitamin A is the cause of blindness.
f) We get phytochemicals from tomato.
g) Stool has fibres which can not be digested.
h) Plant absorb water through root and other parts.
i) Deficiency of iodine causes goitre.
j) Animals get minerals from plants or animals or from water.
Very Short Questions & Answers : (1 mark for each question)
What is needed to do daily work?
Energy is needed to do daily work.
What is the source of energy in our body?
Healthy and balanced diet is the source of energy in our body.
Which is ‘energy giving food’?
Carbohydrates are energy giving food.
Which is ‘body building food’?
Protein is body building food’.
What are protective foods?
Vitamins and minerals are protective foods.
Name some plant sources which supply carbohydrate.
Rice, wheat, potato, beet, pulses etc. are some sources which supply carbohydrate
Name some animal sources which supply carbohydrate?
Honey, milk, meat, liver etc. are some animal sources which supply carbohydrate.
Which disease occurs due to unavailability of glucose in cells?
Diabetes Mellitus occurs due to unavailability of glucose in cells.
What are the functions of muscles of our hands?
Muscles of hand help to lift, push, pull things.
What are the functions of muscles of our legs?
Muscles of leg help in walking, running, climbing jumping etc.
What is the function of Heart?
Circulation of blood in our body.
What is the function of Lungs?
It helps in respiration.
What is the function of Intestine?
Digestion of food is the function of Intestine.
Name the protein present in hair and nail?
Keratin is present in hair and nail.
Name the proteins present in muscle?
Name the protein present in Red Blood Corpuscle?
Which proteins are in blood plasma?
Collagen protein is present in which body parts?
Bone. Tendon, Ligament.
Nans some plant sources which supply protein.
Pea, kindney bean, seeds of jackfruit, millet, corn, garlic, clove, turmeric etc.
Name some animal sources which supply protein.
Ghana, Paneer, Crab, milk, meat, fish, eggs etc.
Name some plant sources of lipid.
Coconut, jackfruit, vegetable cooking oil, whole wheat grain etc.
Name some animal sources of lipid.
Fish oil, milk, curd, meat, ghee, butter, egg yolk, meat, cheese etc.
Beri-Beri causes due to lack of which vitamin?
Which vitamin deficiency disease was common in Europe nearly 500 years ago?
Which vitamin deficiency casues scurvy?
Which vitamin helps in blood clotting?
Which plant sources supply vitamins?
Ripe mango, pumpkin, fig, tomato, spinach, cabbage and other green leafy vegetables.
Which animal sources supply vitamins?
Meat, ghee, eggs, milk, fish, etc.
Name some sources of vitamin B complex.
Cereals, cabbage, leaves of raddish, small fishes, chili, milk etc,
Name some essential minerals which our body requires.
Iron, Calcium, Magnesium, Sodium, Iodine, Zinc etc.
Which parts of the plant produce food?
Food is produced in leaves and other green parts.
What is the right amount of water that one drink daily?
A healthy adult shout eat 50 ml/kg body weight to meet the daily requirement.
Short Questions & Answers : (2 marks for each question)
What is food? Why is food essential?
The source of our energy and disease resistant component is food.
All living beings need energy to remain alive and active. The food we eat provides us with energy as well as those things that our body needs to stay alive and healthy.
What are the main components of food?
The main components of food are –
- Food fibre
Define macronutrients and micronutrients.
Carbohydrates, fats and proteins make up to bulk of our food. They are called macronutrients.
Vitamins and minerals though crucial for health, are needed in small quantities. They are called micronutrients.
Why Food fibres and water are also important components of our food?
Food fibres from the roughage part of our food. They help in the movement of bowel in the intestine. Water helps our body to absorb nutrients from the food. It also helps in removing wastes from the body.
Mianly how many types of carbohydrate are there in our food?
Carbohydrate which we get from our food to keep us strong is mainly of two types— glucose and starch.
How is energy produced in our body?
Energy is produced in the cells of the healthy body by breakdown of glucose. That energy is required for different works.
‘Sometimes intake of milk causes problem’, — What is the reason behind it?
Some children or aged persons suffer from different problem after intake of milk or milk products. Indigestion of leactose, a milk carbohydrates, leads to this type of problem.
What leads to obesity? In which body parts lipid is stored in huge amount in an obese person?
Eating more of energy-rich food than required by the body causes I ipid deposition in the body and leads to abesity. Lipid containing body parts are neek, upper arm, chest, abdomen and thigh, in an obese person.
How is lipid important? What problem will arise if lipid is stored more than necessary?
Lipid acts as sources of energy in the human body and protects the body from external injury. It also reduces heat emission from human body. If more than necessary lipid is stored, the condition can create different problems in heart, blood vessel and liver.
How many types of vitamins are there?
Vitamins are of two types—
- Fat-soluble vitamin—A, D, E and K.
- Water-soluble vitamin—B complex and C.
Name some natural pigments which are present in food from plant sources. How are they helpful to us?
Answer: Some coloured pigments present in plant sources are caroteinoids, flavonoids. They stop fast ageing of human body, keeps healthy functioning of heart, strengthen bones. They also check cancer.
What is balanced diet?
The diet which contains all the essential nutrients in just the right proportion is called a balanced diet. It varies from person to person depending upon sex. age, group of profession.
What are the symptoms of malnutrition in the child?
- Decay of bone in body.
- Muscle is distinct from outside.
- Skin is wrinkled here and there.
- Hands and legs are thin.
Below write the names of different dificiency diseases.
1. Iron dificiency = —
2. Iodine deficiency = —
3. Vitamin D deficiency = —
4. Vitamin B complex deficiency = —
5. Vitamin A dificiency = —
6. Deficiency of protein and energy = —
2. Goitre, mental retardation, squint
6. Marusmus, Kwashiorkar.
Why artificial food should not be taken in huge quentity?
Artificial food is highly priced by the nutrient level in near by nil. Over consumption of these foods leads to problem of heart, liver, kidney, bones or brain.
What are the symptoms of low blood pressure?
Hyponatremia ossures when sodium levels in the blood are too low. Symptoms include lethargy, confusion, and fatigue.
Long Questions & Answers : (3 marks for each question)
Why the diseases Mamasmus and Kwashiorkar occur?
The disease caused by malnutrition is called Marusmus. Deficiency of protein and energy in diet lead to this disease. This is predominant in children below one year. Kwashiorkar disease develops in children of 1-4 years old due to deficiency of protein. Children . suffering from Kwashiorkar show stunted growth, large potlike belly, mental retardation swollen face and dark skin.
What can be the reason of obesity? What are the effects of obesity?
Obesity occurs due to excessive intake of junk food like pizzas, potato wafers, noodles, icecream and soft drinks which contain excessive lipid. Viewing of TV instead of playing outdoor games, is another cause of obesity. Obese persons are prone to heart disease and high blood pressure (hypertension), ft leads to arthritis, diabetes and anaemia. Obesity also causes discomfort and breathlessness.
When malnutrition occurs?
The chance of malnutrition increases if deficiency of energy producing food components are found in diet. Energy producing food components are carbohydrate, protein and lipid. Deficiencv of other food components (vitamin and mineral) also lead to many problems. Worms can be a reason for malnutrition.
Discuss role of water and light in production of food in plants.
Plant absorbs water through root and other parts, sends the absorbed water to leaves. Plant absorbs a small amount of light energy from sunlight. Plants begin the process Photosynthesis with the help of light energy and green pigment chlorophyll. Food is produced in leaves and other green parts by water, sunlight and carbon dioxide absorbed from air.
Describe the importance of water in our body.
Water is needed for the following functions :
- It maintains our body temperature.
- It is needed in the excretion of wastes.
- It acts as a medium for biochemical reactions in our body.
- It helps in the transportation of nutrients within the body.
- It is an essential part of digestive juices and blood.
What is fibre? How is food fibre helpful?
Fibre is a type of Carbohydrate of the nature of cellulose or protein. These may or may not be dissolved in water. The food fibres are formed of cellulose. Since we cannot digest cellulose, human body cannot yield energy from food fibres, it also does not provide us any nutrients.
They simply add bulk to our food and help to get rid of undigested food. Therefore, food fibre help in proper digestion of food as well as in easy and regular movement of bowel. This prevents constipation, colon cancer, obesity high blood pressure and reduces acidity in the stomach.
What will happen if glucose does not enter into cell from blood?
Glucose then circulates through blood till it excretes out from the body through kidney. Different organs (heart, kidney, eye, leg) malfunction due to unavailability of glucose in cells. This condition is termed as Diabetes Mellitus. This disease is very common in India. Proper diet and regular exercise can help to prevent this disease.
Why are minerals necessary? Mention some of its function.
Minerals are necessary for proper growth of body and to maintain good health, like vitamins, minerals does not supply energy to our body. Some functions are —
- Calcium — maintains muscle contraction, helps in blood coagulation.
- Sodium — maintains water level in body.
- Iron — helps in transport of oxygen, needed for the formation of red blood cells.
- Iodine — controls mental abilities and mental growth.
- Zinc — maintains brain functioning and blood sugar level.
- Calcium, Phosphorus, Magnesium — develop bones and teeth.
Name some minerals necessary for our body. How do plants and animals obtain these minerals?
Some minerals necessary for our body are — Iron, Calcium, Magnesium, Sodium, Potassium, Zinc etc.
The minerals are obtained from living organisms as well as non-living compounds.
- Plants collect minerals from soil or ground water under soil.
- Animals get minerals from plant foods, animal foods or water.
What would happen if body looses excessive water? What precautions should be taken then?
Excessive water loss from the body causes dehydration. Due to dehydration blood becomes thicker, causing severe pain and cramps. In order to make up the loss of water and minerals from the body, we should drink a solution prepared by adding one teaspoonful of sugar and a pinch of salt to 200 ml of water. This solution is called Oral Rehydration Solution (ORS).
What is starch? How is glucose important to our body?
Starch is a complex carbohydrate. In the process of digestion, starch, is broken down into the smallest units (Glucose). This glucose is transported to peripheral regions through blood. Here the absorbed oxygen helps in production of energy from glucose in body. This energy helps in different performances.
Describe the importance of protein in our body. What will happen if there is excess protein in our body?
Different kinds of proteins play important roles in producing energy, formation of tissue or parts of body, healing wounds, transport of respiratory gases, contraction of muscles. Protein has important role in providing immunity. Plasma proteins help in coagulation of blood oozing out continuously from any wounded region. Excess protein in body can lead to arthritis, renal stone and other problems.
Which vitamins (A, D, E, K) are needed in the following cases?
|1. Short sight at night||A|
|2. Curved bones and curved vertebral column||D|
|3. blood doesn’t easily coagulate in wounded areas||K|
|4. Damage of red blood cells, heart, brain activity hampered||E|
Symptoms are given write down the names of water-soluble vitamin necessary.
|1. Cracked lips||B-complex|
|2. Nails and lower part of eye becomes pale||B-complex|
|3. Loosening and falling of tooth||C|
|4. Nervous disorder||B-complex|
|5. Loose motion, Demensia||B-complex|