NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

NCERT Solutions for Class 7 Science:- The NCERT Solutions for Class 7 Science are an essential resource designed to support students in understanding and mastering their science curriculum. These solutions are aligned with the NCERT textbooks and offer detailed, step-by-step guidance on various scientific concepts and exercise questions presented in the textbook. Check out the NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals below.

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Nutrition in Animals Class 7 Notes

Go through the  class 7 science chapter 2 question answer below:- 

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 ____________ .

Solution:

(a) The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation, and egestion.

(b) The largest gland in the human body is the liver.

(c) The stomach releases hydrochloric acid and digestive juices that 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.

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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)

Solution:

(a) F

(b) T

(c) T

(d) T

3. Tick (✓) 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) food pipe (iii) small intestine (iv) large intestine

Solution:

(a) (iii) small intestine

(b) (iv) large intestine

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

Solutions:

5. What are villi? What is their location and function?

Solution: Villi are small, finger-like projections located on the inner walls of the small intestine. Their primary function is to increase the surface area for the absorption of nutrients from digested food.

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

Solution: Bile is produced in the liver and plays a crucial role in the digestion of fats by breaking them down into smaller globules, a process known as emulsification.

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

Solution: The carbohydrate cellulose can be digested by ruminants but not by humans. This is because ruminants possess a specific enzyme called cellulase, which helps break down cellulose, whereas humans lack this enzyme.

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8. Why do we get instant energy from glucose?

Solution: Glucose is a simple sugar that is quickly absorbed into the bloodstream, providing immediate energy. Unlike other carbohydrates, which must first be broken down into glucose, this rapid absorption makes glucose 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 ________________.

Solution:

(i) Small intestine

(ii) Buccal cavity

(iii) Stomach

(iv) Small intestine

(v) Large intestine

10. Write one similarity and one difference between nutrition in amoeba and human beings.

Solutions: 

Similarity: Both amoeba and humans exhibit a form of nutrition called holozoic nutrition. This process involves the ingestion of solid food, internal digestion, absorption of nutrients, and egestion of waste. In both organisms, food is taken in from the external environment, broken down into simpler substances within the body, and the essential nutrients are absorbed to sustain life processes. Despite the vast differences in their complexity and structure, the fundamental approach to obtaining and processing food is similar in both amoeba and humans.

Difference: The method of food intake and the subsequent digestion process differ significantly between amoeba and humans due to their structural and functional differences. In humans, food is ingested through the mouth, where it undergoes mechanical and chemical digestion beginning in the buccal cavity. The process involves chewing, mixing with saliva, and then passing through a complex digestive system comprising various specialized organs like the esophagus, stomach, intestines, and accessory glands.

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

Solutions:

12. Label Fig. 2.11 of the digestive system.

Solutions:

 

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

Solution: No, humans cannot survive solely on raw, leafy vegetables or grass because these foods contain cellulose, which is indigestible by humans due to the lack of the enzyme cellulase. Unlike ruminants, humans cannot break down cellulose, making it an inadequate sole source of nutrition.

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NCERT Solutions for Class 7 Science Summary 

The NCERT Solutions for Class 7 Science provide a structured approach to understanding the key concepts outlined in the NCERT textbook. These  solutions cover a range of topics essential to the Class 7 science curriculum, including:

1. Nutrition in Plants: Explains the process of photosynthesis, the role of different plant parts in nutrition, and various modes of nutrition in plants.

2. Nutrition in Animals: Describes the digestive system in animals, including humans, and the process of digestion and absorption of nutrients.

3. Fibre to Fabric: Discusses the sources of fibers, the process of converting fibers into fabric, and the significance of different types of fabrics.

4. Heat: Covers the concepts of temperature, heat, and the transfer of heat through conduction, convection, and radiation.

5. Acids, Bases, and Salts: Introduces the properties of acids, bases, and salts, and their reactions with each other.

6. Physical and Chemical Changes: Differentiates between physical and chemical changes, with examples and explanations of each type of change.

7. Weather, Climate, and Adaptations: Examines weather patterns, climate, and how different organisms adapt to their environments.

8. Soil: Explores the types of soil, its composition, and the role of soil in supporting plant life.

9. Rocks and Minerals: Identifies different types of rocks and minerals, their properties, and their uses.

10. Body Movements: Describes various types of body movements in humans and animals and the role of bones and muscles.

11. Transportation in Animals and Plants: Discusses the transport systems in animals and plants, including the circulatory system and vascular tissues.

12. Reproduction in Plants: Covers the different methods of plant reproduction, including sexual and asexual methods.

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Class 7 Science Chapter 2 FAQs

Q1. What is nutrition in animals?

• Nutrition in animals refers to the process by which animals obtain and utilize food to sustain their growth, energy, and overall health. It involves ingestion, digestion, absorption, and assimilation of nutrients from food.

Q2. What are the main stages of nutrition in animals?

• The main stages of nutrition in animals include ingestion (taking in food), digestion (breaking down food into simpler substances), absorption (absorbing nutrients into the bloodstream), assimilation (using nutrients for bodily functions), and egestion (removal of undigested waste).

Q3. How does the digestive system work in humans?

• In humans, the digestive system involves several organs including the mouth (where digestion begins), esophagus (which transports food to the stomach), stomach (where food is mixed with digestive juices), small intestine (where most digestion and absorption occur), and large intestine (where water is absorbed and waste is formed).

Q4. What is the role of the teeth in digestion?

• Teeth play a crucial role in mechanical digestion by breaking down food into smaller pieces through chewing. This process increases the surface area of food, making it easier for digestive enzymes to act on it.

Q5. What is the function of saliva in the digestive process?

• Saliva, produced by salivary glands, contains enzymes such as amylase that begin the chemical digestion of carbohydrates. It also moistens food, aiding in swallowing and moving it to the stomach.