NCERT Solutions for Class 7 Science Chapter 2 – Nutrition in Animals, contains solutions to various questions in Exercise for Chapter 2. At the end of the Solutions, all the keywords and Notes which are important to understand NCERT Solutions for Class 7 Science Chapter 2- Nutrition in Animals, have been explained in a simple and easy to understand manner. NCERT Solutions for Class 7 help to check the concept you have learnt from detailed classroom sessions and application of your knowledge.
| Category | NCERT Solutions for Class 7 |
| Subject | Science |
| Chapter | Chapter 2 – Nutrition in Animals |
Download NCERT Solutions for Class 7 Science Chapter 2 – Nutrition in Animals
NCERT Solutions for Class 7 Science Chapter 2 – Nutrition in Animals – NCERT Exercises
1.Fill in the blanks:
(a) The main steps of nutrition in humans are __________, __________, __________, _________ and __________.
(b) The largest gland in the human body is __________.
(c) The stomach releases hydrochloric acid and ___________ juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called _________.
(e) Amoeba digests its food in the ____________ .
Answer 1:
(a) The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation and egestion.
(b) The largest gland in the human body is liver.
(c) The stomach releases hydrochloric acid and digestive juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called villi.
(e) Amoeba digests its food in the food vacuole.
2.Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) Digestion of starch starts in the stomach.
(b) The tongue helps in mixing food with saliva.
(c) The gall bladder temporarily stores bile.
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time.
Answer 2-
(a) False
(b) True
(c) True
(d) True
3.Tick mark the correct answer in each of the following:
(a) Fat is completely digested in the
(i) stomach (ii) mouth (iii) small intestine (iv) large intestine
(b) Water from the undigested food is absorbed mainly in the
(i) stomach (ii) foodpipe (iii) small intestine (iv) large intestine
ANSWER 3-
(iii) Small intestine
(iv) Large intestine
4.Match the items of Column I with those given in Column II:
| Column I | Column II |
| Food components | Product(s) of digestion |
| Carbohydrates | Fatty acids and glycerol |
| Proteins | Sugar |
| Fats | Amino acids |
Answer 4-
| Column I | Column II |
| Food components | Product(s) of digestion |
| Carbohydrates | Sugar |
| Proteins | Amino acids |
| Fats | Fatty acids and glycerol |
5.What are villi? What is their location and function?
Answer 5-
Villi are finger like projections in the inner wall of small intestine. There are number of blood vessels present in villi.
Function: Villi increase the surface area for absorption of digested food.
6.Where is the bile produced? Which component of the food does it help to digest?
Answer 6-
Bile is produced in the liver and stored in gall bladder.
Bile helps in the digestion of fats.
7.Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
Answer 7-
Cellulose is the type of carbohydrate that can be digested by ruminants but not by humans.
This is because human lacks the enzyme required to digest cellulose although ruminants have a sac like structure between small intestine and large intestine where a bacteria help in digestion of cellulose
8.Why do we get instant energy from glucose?
Answer 8-
Glucose is a simple sugar and does not need digestion unlike carbohydrates.It gets easily absorbed into blood.
It easily breaks down in cell with the help of oxygen and gives instant energy.
9.Which part of the digestive canal is involved in:
(i) Absorption of food ________________.
(ii) Chewing of food ________________.
(iii) Killing of bacteria ________________.
(iv) Complete digestion of food ________________.
(v) Formation of faeces ________________.
Answer 9-
(i)Absorption of food- Small intestine.
(ii)Chewing of food –Mouth
(iii)Killing of bacteria –Stomach
(iv)Complete digestion of food- Small intestine
(v)Formation of faeces – Large intestine
10.Write one similarity and one difference between the nutrition in amoeba and human beings.
Answer 10-
SIMILARITY-
The digestive juices in amoeba is secreted into the food vacuole and in human beings it is secreted into small intestine and stomach. Then the juice converts complex food into simpler substance.
DIFFERENCE-
In amoeba, food is captured by pseudopodia and in humans, it is taken by mouth.
11.Match the items of Column I with suitable items in Column II
| COLUMN I | COLUMN II |
| Salivary gland | Bile juice secretion |
| Stomach | Storage of undigested food |
| Liver | Saliva secretion |
| Rectum | Acid release |
| Small intestine | Digestion is completed |
| Large intestine | Absorption of water |
| Release of faeces |
ANSWER 11-
| COLUMNE I | COLUMN II |
| Salivary gland | Saliva secretion |
| Stomach | Acid release |
| Liver | Bile juice secretion |
| Rectum | Storage of undigested food |
| Small intestine | Digestion is completed |
| Large intestine | Absorption of water |
12.Label Fig. 2.11 of the digestive system.
Answer 12–
13.Can we survive only on raw, leafy vegetables/grass? Discuss.
ANSWER 13-
No. Humans cannot survive only on raw, leafy vegetables, or grass. It is because the grass is rich in cellulose, which is a type of carbohydrate that humans are not able to digest due to the absence of cellulose-digesting enzymes. Also, leafy vegetables do not provide protein which is required for growth.
Topics Covered in Chapter 2 Nutrition in Animals Class 7 Science-
- Different ways of taking food
- Digestion in humans
- Digestion in grass eating animals
- Feeding and digestion in amoeba
Important Terms Relevant to understand NCERT Solutions for Class 7 Science Chapter 2 – Nutrition in Animals
Absorption-Absorption is the process by which the products of digestion are absorbed by the blood to be supplied to the rest of the body. The small intestine is the organ where absorption occurs.
Amino acid- They are the simplest forms of proteins. Amino acids are the source of all life on the earth. They are also responsible for the growth of organism.
Amoeba- Amoeba is a unicellular organism which has the ability to change its shape by extending its pseudopodia i.e. it does not have any definite structure. They are eukaryotes and found in decaying vegetation in streams.
Assimilation- The process of nutrients being absorbed by each organ of the body, so that complex substances such as proteins required by the body can be synthesised is called assimilation.
Bile- Bile is digestive juice that is secreted by liver and stored in gall bladder. It breaks large globules of fats into smaller globules making the process of digestion easier.
Buccal cavity– Mouth is also referred as buccal cavity through which food and air enters in body. Food is here permeated by saliva.
Canine-Canine are teeth in buccal cavity found at corners of arches. They have sharp and pointed surface. There are total four canine teeth.
Cellulose- It is a chemical compound that makes up the cell wall of all green plants and even some algae. It is a sort of protein having sugar components.
Digestion-It is the process of breaking down of large insoluble food molecules into small water-soluble food molecules. It breaks the food into nutrients which body uses for energy.
Egestion- It is the process of discharging of unwanted waste material from cell or organism. It includes things like carbon dioxide, sweat, faeces etc.
Fatty acid- It is a component of lipids. They are the most fundamental form of fats and body can take them up easily for nutrition.
Food vacuole- Food vacuole is a cavity within the amoeba in which food is digested. It is a fluid filled membrane.
Gall bladder- The gallbladder is a small hollow organ where bile is stored. It lies beneath liver in humans. It delivers bile into the small intestine.
Incisors- Incisors are the front teeth present in mammals. Their function is to tear and crush food. There are total 8 incisors in human buccal cavity.
Ingestion-Ingestion is the process of taking in food through the mouth. The teeth, saliva, and tongue play important roles in breaking down of food into simpler substances.
Liver- It is the largest gland in human body and located beneath the diaphragm and above stomach. It secretes bile juice.
Milk teeth- They are also known as baby teeth. They are the first set of teeth that grow in mouth, which later fall out and are replaced by a second set.
Molar-They are large, flat teeth at the back of the mouth. They are used to grind food during chewing. They are the largest of teeth.
Permanent teeth-They are also known as adult teeth and come after the set of milk teeth. They intended to remain in the mouth for the whole lifetime. There are total 32 permanent teeth in adults.
Oesophagus- It is also known as food pipe. It is part of alimentary canal and connects the throat to the stomach. It delivers food swallowed from mouth to stomach.
Pancreas-It is a long, flat gland that lies in the abdomen behind the stomach. Pancreatic juice is secreted by the pancreas into the small intestine. It also secretes insulin which help in balance of sugar level.
Premolar- They are located between the canine and molar teeth. Their function is to tear and crush food. There are total 8 pre molar teeth in human adult.
Pseudopodia- It is finger-like projections in amoeba. It is used in movement and as a tool to capture prey.
Rumen- It is the first stomach of a ruminant, which receives food from the oesophagus. It stores food that a ruminant brings up, chews again and swallows a second time.
Ruminant- A ruminant is a mammal with hooves and have a complicated system of stomach. Their digestion works by chewing partly digested food a second time in order to soften it. Examples are- Cow, giraffe, goats etc.
Rumination-It is a process in which the animals bring the previously consumed food into the mouth once again and chew it. This process is performed by ruminants like cow, goats etc.
Salivary glands-These glands discharge saliva into the mouth cavity. It keeps the mouth and other parts of the digestive system moist. It also helps break down carbohydrates.
Villi- They are small, finger-like projections that extend into the lumen of the small intestine. Villi help in absorption by increasing the surface area of the intestine.
Saliva- It is watery liquid secreted into the mouth by salivary glands. Saliva contains the enzyme amylase that breaks some starches down into maltose.
NCERT Solutions for Class 7 Science
- Nutrition in Plants
- Nutrition in Animals
- Fiber To Fabric
- Heat
- Acids, Bases and Salts
- Physical And Chemical Changes
- Weather, Climate and Adaptations of Animals to Climate
- Winds, Storms and Cyclones
- Soil
- Respiration in Organisms
- Transportation in Animals And Plants
- Reproduction in Plants
- Motion And Time
- Electric Current And Its Effects
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