NCERT Exemplar solutions for Science [English] Class 7 chapter 2 - Nutrition in Animals [Latest edition]

Given below from (i) to (iv) are some food items.

1. Boiled and mashed potato
2. Glucose solution
3. A slice of bread
4. Mustard oil

Which of the above will give a blue-black colour when tested with iodine?

Which of the following pair of teeth differ in structure but are similar in function?

Read carefully the terms given below. Which of the following set is the correct combination of organs that do not carry out any digestive functions?

The swallowed food moves downwards in the alimentary canal because of ______.

The acid present in the stomach ______.

The finger-like outgrowths of Amoeba helps to ingest food. However, the finger-like outgrowths of human intestine helps to ______.

Read the following statements with reference to the villi of small intestine.

1. They have very thin walls.
2. They have a network of thin and small blood vessels close to the surface.
3. They have small pores through which food can easily pass.
4. They are finger-like projections

Identify those statements which enable the villi to absorb digested food.

The false feet of Amoeba are used for ______.

The enzymes present in the saliva convert ______.

Cud is the name given to the food of ruminants which is ______.

Choose the correct order of terms that describes the process of nutrition in ruminants.

Cellulose-rich food substances are good source of roughage in human beings because ______.

Name the parts of the alimentary canal where water gets absorbed from undigested food.

Name the parts of the alimentary canal where digested food gets absorbed.

Name the parts of the alimentary canal where taste of the food is perceived.

Name the parts of the alimentary canal where bile juice is produced.

Mark the following statement as True or False. If false, write the correct statement.

Tongue is attached to the roof of the mouth cavity at the back.

Mark the following statement as True or False. If false, write the correct statement.

The large intestine is longer and wider than the small intestine of the human alimentary canal.

Mark the following statement as True or False. If false, write the correct statement.

Mucus protects the stomach lining from damage.

Mark the following statement as True or False. If false, write the correct statement.

All heterotrophs have a similar basic process of nutrition.

Choose the odd one out from the group and give a reason.

liver, salivary gland, starch, gall bladder

Choose the odd one out from the group and give reason.

Choose the odd one out from the group and give reason.

Choose the odd one out from the group and give reason.

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it in spite of being blindfolded?

The alimentary canal stretches from ______ to ______.

Teeth are rooted in separate ______ in between the ______.

Digestion of food starts in ______ and gets completed in ______.

______ is the largest gland in the human body.

Following statements describe animal nutrition. Read the statement and give one word for the statement. Write the terms that describe process.

Transportation of absorbed food to different parts of body and their utilisation

Following statements describe animal nutrition. Read the statement and give one word for the statement. Write the terms that describe process.

Breaking of complex food substances into simpler and soluble substances.

Following statements describe animal nutrition. Read the statement and give one word for the statement. Write the terms that describe process.

Removal of undigested and unabsorbed solid residues of food from the body.

Following statements describe animal nutrition. Read the statement and give one word for the statement. Write the terms that describe process.

Taking food into the body.

Following statements describe animal nutrition. Read the statement and give one word for the statement. Write the terms that describe process.

Transport of digested and soluble food from the intestine to blood vessels.

Match the animals in Column I with their mode of feeding listed in Column II

Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in test tube ‘B’. Both of them poured 1-2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

A’ got her gall bladder removed surgically as she was diagnosed with stones in her gall bladder. After the surgery, she faced problems in digestion of certain food items when consumed in bulk. Can you tell which kind of food items would they be and why?

Match the organs in Column I with the words listed in Column II.

Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you reason why?

Boojho and Paheli were eating their food hurriedly so that they could go out and play during recess. Suddenly, Boojho started coughing violently. Think of the reasons why he was coughing and discuss them with your friends.

Fill in the blanks using the words listed below.

1. The digestion of all food components is completed by the ______ juice.
2. Large intestine absorbs ______ and some ______ from the undigested food.
3. Tongue is attached at the ______ to the floor of the mouth cavity and is free at the ______.
4. Amoeba pushes out ______ around the food and traps it in a food ______.

Label the below given Figure as directed below in (i) to (iv) and give the name of each type of teeth.

1. The cutting and biting teeth as ‘A’
2. The piercing and tearing teeth as ‘B’
3. The grinding and chewing teeth as ‘C’
4. The grinding teeth are present only in adults as ‘D’

Read the following passage carefully and answer the questions that follow it.

1. Which organ secretes the bile juice?
2. Why is digestion of fats difficult as compared to that of other nutrients?
3. How does bile juice help in the digestion of fat?
4. Where is the digestion of fat completed?
5. Does bile juice digest fat completely?

Label the following parts in Figure and name them.

1. The largest gland in our body.
2. The organ where protein digestion starts.
3. The organ that releases digestive juice into the small intestine.
4. The organ where bile juice gets stored.

Open your mouth, look into a mirror and try to count the different types of teeth in your mouth. Compare them with Figure on page 13 of your NCERT textbook.

Record your observations in the table below:

1. Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?
2. Compare the number and type of teeth in an adult (say your parents or cousins who have reached the age of 25-30 or more). Note your observation.

Solve the crossword given as Figure.