Class-7 Subject-Science Chapter-1 Slot-1 NUTRITION IN PLANTS

 
EVENTS CONVENT HIGH SCHOOL
27/07/2021           CLASS-7             SESSION2021-22(SLOT-1)
SCIENCE
Chapter-1
NUTRITION IN PLANTS
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I.ANSWER THE FOLLOWING QUESTIONS:-

 Q.1. Why do organisms need to take food?

Ans. Food is needed by all organisms for many purposes:

(a) The main function of food is to help in growth.

(b) Food provides energy for movements such as running, walking or raising our arm.

(c) Food is also needed for replacement and repairing damaged parts of body.

(d) Food gives us resistance to fight against diseases and protects us from infections

 

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

Ans. The presence of starch in leaves can be tested by Iodine test. When we remove chlorophyll from leaf by boiling it in alcohol and then put 2 drops of iodine solution, its colour change to blue indicates the presence of starch.

 

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

Ans. The green plants have chlorophyll in the leaves. The leaves use C02 and water to make food in presence of sunlight.

 

 II. Fill in the blanks:

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

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

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

(d) During photosynthesis plants take in  carbon dioxide  and release oxygen

  

III. Name the following:

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

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

(iii) The pores through which leaves exchange gases.: Stomata

 

 IV. 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:

(a) Cuscuta (ii) China rose {iii) Pitcher plant(√   ) (iu) Rose

 

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

 (i) Carbon dioxide is released during photosynthesis. (False)

(ii) Plants which synthesize their food themselves are called saprotrophs. (False)

(iii) The product of photosynthesis is not a protein. (True)

(iv) Solar energy is converted into chemical energy during photosynthesis. (True)