NCERT Solutions for Class 7 Science Chapter 1

Nutrition in Plants Class 7

Chapter 1 Nutrition in Plants Exercise Solutions

Next Chapter 2 : Nutrition in Animals >>

Exercise : Solutions of Questions on Page Number : 9

Q1 :  

Why do organisms need to take food?


Answer :

All living organisms require food to survive. It gives them energy to perform various activities. All activities such as playing, running, walking, studying, etc. require energy. The various components present in our food such as carbohydrates, proteins, fats, vitamins, and minerals provide energy to our body. These are also important for growth and development of the body.

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Q2 :  

Distinguish between a parasite and a saprotroph.


Answer :

Parasite

Saprotroph

The organism that grows on the body of another organism and derives nutrients from it is known as a parasite.

The organism that obtains nutrients from the dead or decaying organic matter is called saprotroph.

Examples of parasites are Cuscuta and orchids.

Examples of saprotrophs are fungi and some bacteria.

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Q3 :  

How would you test the presence of starch in leaves?


Answer :

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Q4 :  

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


Answer :

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Q5 :  

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


Answer :

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Q6 :  

Fill in the blanks:

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

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

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

(d) During photosynthesis plants take in ___________and release ___________.


Answer :

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Q7 :  

Name the following:

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

(ii) A plant that has both autotrophic and heterotrophic mode of nutrition.

(iii) The pores through which leaves exchange gases.


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Q8 :  

Tick the correct answer:

(a)Amarbel 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


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Q9 :  

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

Column I

Column II

Chlorophyll

Bacteria

Nitrogen

Heterotrophs

Amarbel

Pitcher plant

Animals

Leaf

Insects

Parasite


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Q10 :  

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 themselves 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)


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Q11 :  

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) Sepals


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Q12 :  

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


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Next Chapter 2 : Nutrition in Animals >>

Science : CBSE NCERT Exercise Solutions for Class 7th for Nutrition in Plants will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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