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Ncert exemplar Solutions Class 7 Science Nutrition in Animals
Welcome to NCTB Solutions. Here with this post we are going to help 7th class students for the Solutions of NCERT Exemplar Class 7 Science Book, Unit 2, Nutrition in Animals. Here students can easily find step by step solutions of all the problems for Nutrition in Animals, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Nutrition in Animals Solution :
Multiple Choice Questions :
Question no – (1)
Given below from (i) to (iv) are some food items.
Answer :
The correct answer is option – (b) (i) and (iii)
Boiled and mashed potato and A slice of bread will give blue-black colour when tested with iodine.
Question no – (2)
Which of the following pair of teeth differ in structure but are similar in function?
Answer :
The correct option is – (b)
Molars and Premolars differ in structure but are similar in function.
Question no – (3)
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?
Answer :
The correct option is – (a)
The correct set of combination is – Oesophagus, Large Intestine, Rectum.
Question no – (4)
The swallowed food moves downwards in the alimentary canal because of
Answer :
The correct answer is option – (d)
The swallowed food moves downwards in the alimentary canal because of the contraction of muscles in the wall of food pipe.
Question no – (5)
The acid present in the stomach
Answer :
The correct answer is option – (a)
The acid present in the stomach kills the harmful bacteria that may enter along with the food.
Question no – (6)
The finger-like outgrowths of Amoeba helps to ingest food. However, the finger-like outgrowths of human intestine helps to
Answer :
The correct answer is alternative – (c)
The finger-like outgrowths of human intestine helps to absorb the digested food.
Question no – (7)
Read the following statements with reference to the villi of small intestine.
Answer :
The correct answer is option – (a) (i), (ii) and (iv)
The statements which enable the villi to absorb digested food are –
• They have very thin walls.
• They have a network of thin and small blood vessels close to the surface.
• They are finger-like projections.
Question no – (8)
The false feet of Amoeba are used for
Answer :
The correct answer is alternative – (c)
The false feet of Amoeba are used for capture of food and movement.
Question no – (9)
The enzymes present in the saliva convert
Answer :
The correct option is – (b)
The enzymes present in the saliva convert starch into simple sugars.
Question no – (10)
Cud is the name given to the food of ruminants which is
Answer :
The correct answer is option – (b)
Cud is the name given to the food of ruminants which is swallowed and partially digested.
Question no – (11)
Choose the correct order of terms that describes the process of nutrition in ruminants.
Answer :
The correct answer is option – (a)
The correct order is –
Swallowing → Partial digestion → Chewing of cud → Complete digestion.
Question no – (12)
Cellulose-rich food substances are good source of roughage in human beings because
Answer :
The appropriate option is – (a)
Cellulose-rich food substances are good source of roughage in human beings because human beings do not have cellulose-digesting enzymes.
Very Short Answer Questions :
Question no – (13)
Answer :
(i) The parts of the alimentary canal where water gets absorbed from undigested food is called Large intestine.
(ii) The parts of the alimentary canal where digested food gets absorbed is called Small intestine.
(iii) The parts of the alimentary canal where taste of the food is perceived is called Tongue.
(iv) The parts of the alimentary canal where bile juice is produced is called Liver.
Question no – (14)
Answer :
(a) Tongue is attached to the roof of the mouth cavity at the back
This statement is False.
Because, Tongue is attached to the floor of the mouth cavity at the back.
(b) The large intestine is longer and wider than the small intestine of the human alimentary canal.
This statement is False.
Because, The large intestine is shorter and wider than the small intestine of the human alimentary canal.
(c) Mucus protects the stomach lining from damage
This statement is True.
(d) All heterotrophs have a similar basic process of nutrition
This statement is True.
Question no – (15)
Answer :
(a) Here odd one is Starch.
Reason : Apart from starch all others are parts of the digestive system and helps in digestion.
(b) Here odd one is Stomach.
Reason : Apart from stomach all others are glands present in our body.
(c) Here odd one is Absorption.
Reason : Unlike others Absorption is neither a part of the mouth nor the function of the mouth.
(d) Here odd one is Small intestine.
Reason : Only small intestine is involved in the process of absorption of food.
Question no – (16)
Answer :
I was able to identify the beverages A and B even being blindfolded because just like other people I have small taste buds on my tongue to detect taste of the drink I was having and that does not requires eyes to be open.
Question no – (17)
Answer :
(a) The alimentary canal stretches from Mouth to Anus.
(b) Teeth are rooted in separate Sockets in between the Gums.
(c) Digestion of food starts in Buccal cavity or mouth and gets completed in Small intestine.
(d) Liver is the largest gland in the human body.
Question no – (18)
Answer :
(a) Transportation of absorbed food to different parts of body and their utilisation.
= Assimilation.
(b) Breaking of complex food substances into simpler and soluble substances.
= Digestion.
(c) Removal of undigested and unabsorbed solid residues of food from the body.
= Egestion.
(d) Taking food into the body.
= Ingestion.
(e) Transport of digested and soluble food from the intestine to blood vessels
= Absorption.
Question no – (19)
Answer :
(a) → (iii) Sponging.
(b) → (i) Biting and chewing.
(c) → (iv) Sucking.
(d) → (ii) Suckling.
Question no – (20)
Answer :
In test tube A the colour of the boiled rice will change to blue black as it has some amount of starch in it while the boiled and chewed rice in test tube B will not change into blue black as the starch in it has already been converted into sugar by the saliva in her mouth.
Question no – (21)
Answer :
She would have much problems in digestion of foods like butter, cheese, ghee and other food items that contain fats since she does not have gall bladder as it was removed and we know that gall bladder releases bile which helps in the digestion of fat.
Question no – (22)
Answer :
(a) Rectum → (iv) Faeces.
(b) Gall bladder → (v) Bile juice.
(c) Stomach → (i) Mucous.
(d) Tongue → (iii) Taste buds.
(e) Small Intestine → (ii) Villi.
Question no – (23)
Answer :
Cows and buffaloes swallow their food hurriedly as they have a large sac in their body where the cellulose of the plants are digested by certain bacteria. This partially digested food is repeatedly brought to the mouth in small lumps so that the animal could chew it again properly. This chewed food then travels again through the digestive system where the other nutrients are absorbed in the small intestine.
Question no – (24)
Answer :
It might happened that when Boojho was eating hurriedly his flip like valve which closes the wind pipe during eating remained open so the food particles might have entered the windpipe to which his body responded with a cough to forcefully eject the food.
Long Answer Questions :
Question no – (25)
Answer :
(a) The digestion of all food components is completed by the Intestinal juice.
(b) Large intestine absorbs Water and some Salts from the undigested food.
(c) Tongue is attached at the Back to the floor of the mouth cavity and is free at the Front.
(d) Amoeba pushes out Pseudopodia around the food and traps it in a food Vacuole.
Question no – (26)
Answer :
(i) The cutting and biting teeth as ‘A’
= Incisors.
(ii) The piercing and tearing teeth as ‘B’
= Premolars.
(iii) The grinding and chewing teeth as ‘C’
= Canine.
(iv) The grinding teeth present only in adult as ‘D’
= Molars.
Question no – (27)
Answer :
(a) Which organ secretes the bile juice?
= Liver secretes the bile juice.
(b) Why is digestion of fats difficult as compared to that of other nutrients?
= Fats are hard to digest since they do not dissolve in water.
(c) How does bile juice help in digestion of fat?
= Biles help in the digestion of fat by breaking down large fat globules into smaller ones.
(d) Where is the digestion of fat completed?
= The digestion of fats is completed in the small intestine.
(e) Does bile juice digest fat completely?
= No, bile does not digest the fats completely.
Question no – (28)
Answer :
(a) Liver is the largest gland in our body.
(b) Protein digestion starts in the stomach.
(c) Pancreas releases its digestive juice in the small intestine.
(d) Bile juice is stored in the gall bladder.
Question no – (29)
Answer :
In my mouth :
Incisors = 4
Canines = 8
Premolar = 8
Molar = 8
In the figure :
Incisors = 4
Canines = 8
Premolar = 8
Molar = 12
(a) Yes, there was a difference in the number of the teeth .The were 4 molars in the my jaw whereas in the figure there are 6 molars in each jaw.
(b) My parents had 32 teeth in total while I had only 28 teeth. My parents have 6 molars in each jaw but I have only 4 in each jaw.
Other Chapter Solutions :
👉 Heat
👉 Physical and Chemical Changes
👉 Weather, Climate and Adaptation of Animals to Climate
👉 Soil
👉 Transportation in Animals and Plants
👉 Electric Current and Its Effects
👉 Light
👉 Wastewater Story
