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NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

Here you will get NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals will encourage students to learn new topics and increase concentration among students. It will improve your awareness skills sharply and you can easily memorize more things precisely. Class 7 NCERT Solutions is an effective method for learning since you can be able to learn a lot within a short time. In the examinations, you will can come up with better answers and lay out the main point effectively.

NCERT Textbook will provide you with a lot of interesting topics thus these NCERT Solutions for Class 7 will be useful in understanding in depth concepts well. Chapter 2 Nutrition in Animals Class 7 Science NCERT Questions and Answers help students grasp basic concepts better and faster. Students can cross check their answers and also whether they learned it properly or not.

NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals


Detailed explanation provided under each NCERT solutions for Class 7 Science will help in understanding the concepts better. It will be useful in expanding student's horizon as it cover variety of questions. Your marks play an important role in shaping future thus these NCERT Solutions for Science will become your comprehensive guide in easy learning and evaluating yourself.

 Study Material for Class 7 Science Chapter 2 Nutrition in Animals

Page No: 20

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

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. (T/ F)
(b) The tongue helps in mixing food with saliva. (T/ F)
(c) The gall bladder temporarily stores bile. (T/ F)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/ F)

Answer

(a) F
(b) T
(c) T
(d) T

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

(a) Fat is completely digested in the (iii) small intestine

(b) Water from the undigested food is absorbed mainly in the (iv) large intestine

Page No: 21

4. Match the items of Column I with those given in Column II:

Column I
Food Components
Column II
Product(s) of digestion
Carbohydrates Fatty Acids and Glycerol
Proteins Sugar
Fats Amino acids

Answer

Column I
Food Components
Column II
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

Villi are small finger-like outgrowths present that help in the process of absorption. These are located in the inner walls of the small intestine. Its function is to increase the surface area of the small intestinal wall for absorption of the digested food.

6. Where is the bile produced? Which component of the food does it help to digest?

Answer

The bile juice is secreted by the liver. Bile juice helps in the digestion of fats by breaking down the larger fat globules to smaller fat globules.

7. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.

Answer

Cellulose is a type of carbohydrate that can be digested by ruminants and not by humans.
Ruminants have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria which are not present in humans.

8. Why do we get instant energy from glucose?

Answer

Glucose is simple sugar which is formed when carbohydrate get broken. Also, the carbohydrate get digested into glucose. Since, glucose does not have to be digested and thus acts as an instant source of 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

(i) absorption of food small intestine.

(ii) chewing of food buccal cavity.

(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

Similarity:
Both Amoeba and human have holozoic type of nutrition.
Difference:
Human beings have complex structure for the ingestion, digestion and egestion of food while Amoeba has simple process in which it engulfs the with the help of pseudopodia and food get trapped in food vacuoles.

11. Match the items of Column I with suitable items in Column II

Column I Column II
(a) Salivary gland (i) Bile juice secretion
(b) Stomach (ii) Storage of undigested food
(c) Liver (iii) Saliva secretion
(d) Rectum (iv) Acid release
(e)Small intestine (v) Digestion is completed
(f)Large intestine (vi) Absorption of water
 - (vii) Release of faeces

Answer

Column I Column II
(a) Salivary gland (iii) Saliva secretion
(b) Stomach (iv) Acid release
(c) Liver (i) Bile juice secretion
(d) Rectum (ii) Storage of undigested food
(e)Small intestine (v) Digestion is completed
(f)Large intestine (vi) Absorption of water

Page No: 22

12. Label Fig. 2.11 of the digestive system.

Answer


13. Can we survive only on raw, leafy vegetables/ grass? Discuss.

Answer  

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.


Chapter 2 Nutrition in Animals Class 7 Science NCERT Solutions


NCERT Solutions for Class 7 Science Chapter 2 will make you well versed in variety of topics and you will be able to instantly recollect your ideas and shape your answers. Through these NCERT Solutions, students should not waste time and adopt a strategy that helps them operate and learn at maximum efficiency. You will get step by step and to the points answers of every question given inside the textbook.

Class 7 Science Chapter 2 Nutrition in Animals NCERT Questions and Answers - Topics


• Different Ways Of Taking Food
• Digestion in Humans
→ The mouth and buccal cavity
→ The foodpipe/oesophagus
→ The stomach
→ The small intestine
→ Absorption in the small intestine
→ Large intestine
• Digestion In Grass-eating Animals
• Feeding And Digestion In Amoeba

Class 7 Science Chapter 2 Nutrition in Animals NCERT Questions and Answers - Topics


• Animal nutrition includes nutrient requirement, mode of intake of food and its utilisation in the body.

• The breakdown of complex components of food into simpler substances is called digestion.

• Each species or type of organism has their own way of taking in food.

→ Bees and hummingbirds suck plant-nectars, infant of humans and some animals feed on mother’s milk, Snakes such as python consume the animals upon which they prey.

→ Aquatic animals filter small food particles floating close by and feed on them.

• The digestive system of human consists of Mouth, Buccal Cavity, Oesophagus, Pharynx, Stomach Duodenum, Small Intestine, Large Intestine (colon), Rectum and Anus.

• Mouth and Buccal Cavity is bounded by the upper lip and lower lip.

→ Food is entered into the Buccal Cavity through mouth is called ingestion.

→ Salivary glands are present inside the Buccal Cavity. They secrete saliva that plays an important role in breaking down complex components like starch which is further simplified into sugars.

• A flap-like valve called the epiglottis closes the windpipe. It prevents the entry of food particles into tracheae.

→ Movement of food inside the esophagus in the stomach is by peristalsis movement.

• The stomach is a thick-walled bag. Its shape is like a flattened J and it is the widest part of the alimentary canal.

→ Food is digested inside the stomach with the help of gastric juice secreted by the gastric glands present in the stomach.

→ Liver is the largest gland in our body produces bile juice which plays an important role in the digestion of fats.

→ Pancreas is the Mixed gland, it acts as both an endocrine and an exocrine gland that secretes the pancreatic juice that helps to digest carbohydrates, proteins and fats.

• The digested food can now pass into the blood vessels in the wall of the intestine. This process is called absorption.

→ The inner walls of the small intestine have millions of small finger-like projections called the Villi. Due to their presence the surface area for digestion as well as absorption of digested food increases by eight times.

→ The absorbed substances are transported via the blood vessels to different organs of the body where they are used to build complex substances such as the proteins required by the body. This is called assimilation.

• The remaining waste passes into the rectum and remains there as semi-solid faeces. The faecal matter is removed through the anus from time-to-time. This is called egestion.

• The grazing animals like cows, buffaloes and deer are known as ruminants. They quickly ingest, swallow their leafy food and store it in the rumen. Later, the food returns to the mouth and the animal chews it peacefully.

• Amoeba is a microscopic single-celled organism found in pond water. It ingests its food with the help of its false feet or pseudopodia. The food is digested in the food vacuole.

Chapter 2 Nutrition in Animals Class 8 Science Questions and Answers - MCQ Questions with answers


1. Which of the following component of food do not provide energy of body building?
(a) Roughage
(b) Proteins
(c) Carbohydrates
(d) Fats
► (a) Roughage

2. These are blood sucking parasites.
(a) Earthworm
(b) Hookworm
(c) Leeches
(d) Caterpillar
► (c) Leeches

3. Which of the following pair of teeth differ in structure but are similar in function?
(a) Canines and incisors
(b) Molars and premolars
(c) Incisors and molars
(d) Premolars and canines
► (b) Molars and premolars

4. Duodenum, Jejunum, ileum are ______ parts.
(a) Small Intestine
(b) Large Intestine
(c) Esophagus
(d) Stomach
► (a) Small Intestine

5. Why are nutrition in animals holozoic?
(a) because they depend on plants for food
(b) because they are heterotrophs
(c) because they can shallow food
(d) all the above
► (d) all the above

6. In amoeba, digestion of food takes place inside
(a) Food pipe
(b) Gizzard
(c) Food vacuole
(d) Stomach
► (c) Food vacuole

7. Breaking down of food into simpler form using enzyme is called______.
(a) Assimilation
(b) Egestion
(c) Digestion
(d) Absorption
► (c) Digestion

8. Raccoon is an example of which type of animal-
(a) Herbivore
(b) Omnivore
(c) Carnivore
(d) Parasite
► (b) Omnivore

9. Which gland acts as mixed gland?
(a) Pancreas
(b) Duodenum
(c) Hypothalamus gland
(d) Digestive gland
► (a) Pancreas

10. Which enzyme helps in transfer of Trypsinogen to trypsin secreted from the walls of the small intestine?
(a) Proteinase
(b) Enterokinase
(c) Amylase
(d) Lactase
► (b) Enterokinase

NCERT Solutions is an effective method for learning since you can be le to learn a lot within a short time. These NCERT Solutions for Class 7 are prepared as per the accordance of latest CBSE guidelines so you can score maximum marks. It is very challenging to score good marks in tests that is why we have prepared NCERT Solutions.

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NCERT Solutions for Chapter 5 Acids, Bases and Salts
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NCERT Solutions for Chapter 7 Weather, Climate and Adaptations of Animals to Climate
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