NCERT Solutions For Class 7 Science Chapter 1: Nutrition In Plants

NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants

Learn from School Connect Online in this chapter we will learn that all living organisms require food. Food gives energy to the organisms for the growth and maintenance of their body functions. Carbohydrates, proteins, fats, vitamins and minerals are the essential components of food. These components of food are necessary for our body and are called nutrients.

Download PDF of NCERT Solutions for Class 7 Science   

NCERT Solutions Download Class 7	Chapter Name	NCERT Solutions Download Class 7	Chapter Name
NCERT Solutions For Class 7 Science Chapter 1: Nutrition In Plants	Nutrition in Plants	NCERT Solutions for Class 7 Chapter 10 Respiration in Organisms	Respiration in Organisms
NCERT Solutions for Class 7 Chapter 2 Nutrition in Animals	Nutrition in Animals	NCERT Solutions for Class 7 Chapter 11 Transportation in Animals and Plants	Transportation in Animals and Plants
NCERT Solutions for Class 7 Chapter 3 Fibre to Fabric	Fibre to Fabric	NCERT Solutions for Class 7 Chapter 12 Transportation in Animals and Plants	Reproduction in Plants
NCERT Solutions for Class 7 Chapter 4 Heat	Heat	NCERT Solutions for Class 7 Chapter 13 Motion and Times	Motion and Times
NCERT Solutions for Class 7 Chapter 5 Acids,Bases and Salts	Acids,Bases and Salts	NCERT Solutions for Class 7 Chapter 14 Electric Current and its Effects	Electric Current and its Effects
NCERT Solutions for Class 7 Chapter 6 Physical and Chemical Changes	Physical and Chemical Changes	NCERT Solutions for Class 7 Chapter 15 Light	Light
NCERT Solutions for Class 7 Chapter 7	Weather,Climate and Adaptations of Animals to Climate	NCERT Solutions for Class 7 Chapter 16 Water;A precious resource	Water;A precious resource
NCERT Solutions for Class 7 Chapter 8	Winds Storms and Cyclones	NCERT Solutions for Class 7 Chapter 17 Forests;Our life line	Forests;Our life line
NCERT Solutions for Class 7 Chapter 9	Soil	NCERT Solutions for Class 7 Chapter 18 Waste water story	Waste water story

Exercise Questions

1. Why do organisms take food?

Solution:

All organisms require energy for their life processes. Plants prepare their food and acquire nutrients from abiotic components like soil, air, water and sunlight. On the other hand, animals need to get food from either plants or other animals to obtain nutrients; hence animals need to take food to acquire nutrients and energy.

2. Distinguish between a parasite and a saprophyte.

Solution:

Saprophytes	Parasites
Acquire nutrients from dead and decaying matter	Parasites live on or in a host and get its food at the expense of its host
Example: Fungi	Example: roundworm

3. How would you test the presence of starch in leaves?

Solution:

Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in sunlight. Perform the iodine test with the leaves of both the plants as given below. Now leave the pot which was earlier kept in the dark, undisturbed for 3 – 4 days and perform the iodine test again on its leaves.

Iodine test:

Put iodine solution on the leaf

Observation:

Blue-black colour will be observed on the leaves of the plant kept in sunlight, which indicates the presence of starch.

Blue-black colour will not be observed on the leaves of plants kept in the darkroom. This indicates the absence of starch.

4. Give a brief description of the process of synthesis of food in green plants

Solution:

Green plants use a process called photosynthesis to prepare their food. The process is as follows

• Water is taken from the roots of the plant, and it is transported to the leaves of the plant.
• Carbon dioxide from air enters the leaves through pores called stomata. This diffuses the cell containing chlorophyll.
• Water molecules are broken down into Hydrogen and Oxygen with the help of sunlight.
• Hydrogen combines with Oxygen and Hydrogen to form carbohydrates.
• Photosynthesis is represented by the following equation.

5. Show with the help of a sketch that plants are the ultimate source of food.

Solution:

6. Fill in the blanks:

(a) Green plants are called _________________ since they synthesise their own food.

(b) The food synthesised by plants is stored as _________________.

(c) In photosynthesis solar energy is absorbed by the pigment called ___________.

(d) During photosynthesis plants take in ______________________ and release __________________ gas.

Solution:

(a) Green plants are called autotrophs since they synthesise their food.

(b) The food synthesised by plants is stored as starch.

(c) In photosynthesis, solar energy is absorbed by the pigment called chlorophyll.

(d) During photosynthesis, plants take in Carbon dioxide and release Oxygen gas.

7. Name the following:

i) A parasitic plant with yellow, slender and branched stem.

ii) A plant that is partially autotrophic.

iii) The pores through which leaves exchange gases.

Solution:

i) Cuscuta

ii) Pitcher plant

iii) Stomata

8. Tick the correct answer:

(a) Cuscuta is an example of:

(i) autotroph

(ii) parasite

(iii) saprotroph

(iv) host

(b) The plant which traps and feeds on insects is:

(i) Cuscuta

(ii) china rose

(iii) pitcher plant

(iv) rose

Solution:

1. (ii) Parasite
2. (iii) pitcher plant

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

Column- I	Column-II
Chlorophyll	Rhizobium
Nitrogen	Heterotrophs
Cuscuta	Pitcher plant
Animals	Leaf
Insects	Parasite

Solution:

Column- I	Column-II
Chlorophyll	Leaf
Nitrogen	Rhizobium
Cuscuta	Parasite
Animals	Heterotrophs
Insects	Pitcher plant

10. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Carbon dioxide is released during photosynthesis. (T/F)

(ii) Plants which synthesise their food are called saprotrophs. (T/F)

(iii) The product of photosynthesis is not a protein. (T/F)

(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)

Solution:

1. False
2. False
3. True
4. True

11. Choose the correct option from the following:

Which part of the plant takes in carbon dioxide from the air for photosynthesis?

(i) Root hair (ii) Stomata (iii) Leaf veins (iv) Petals

Solution:

The answer is (ii) Stomata

12. Choose the correct option from the following:

Plants take carbon dioxide from the atmosphere mainly through their:

(i) roots (ii) stem (iii) flowers (iv) leaves

Solution:

Answer is : (iv) leaves

13. Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?

Solution:

Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic conditions and provide suitable temperature for the growth of crops.

Advantages to farmers while growing fruits and vegetable crops inside greenhouses are

• It protects crops from diseases and adverse climatic conditions.
• It protects crops from wind and rodents

CBSE Notes for Class 7 Science Free Download for All Chapters

CBSE Class 7 Science Study Notes	CBSE Class 7 Science Study Notes
Nutrition in Plants Class 7 Notes Chapter 1	Respiration in Organisms Class 7 Notes Chapter 10
Nutrition in Animals Class 7 Notes Chapter 2	Transportation in Animals and Plants Class 7 Notes Chapter 11
Fibre to Fabric Class 7 Notes Chapter 3	Reproduction in Plants Class 7 Notes Chapter 12
Heat Class 7 Notes Chapter 4	Motion and Times Class 7 Notes Chapter 13
Acids,Bases and Salts Class 7 Notes Chapter 5	Electric Current and its Effects Class 7 Notes Chapter 14
Physical and Chemical Changes Class 7 Notes Chapter 6	Light Class 7 Notes Chapter 15
Weather,Climate and Adaptations of Animals to Climate Class 7 Notes Chapter 7	Water;A precious resource Class 7 Notes Chapter 16
Winds Storms and Cyclones Class 7 Notes Chapter 8	Forests;Our life line Class 7 Notes Chapter 17
Soil Class 7 Notes Chapter 9	Waste water story Class 7 Notes Chapter 18

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