1.    Organism needs food to

(i) Get energy to do work.

(ii) Build body

(iii) Repair damage in the body

(iv) Maintain the functions of the body

2.    Parasite

(i) Parasite derives nutrients form the living organism.

(ii) Parasites mostly live on or in the host.


(i) They derive nutrients from dead and decaying organism.

(ii) They live on dead and decaying stuff.

3.    When iodine comes in contact with starch, a dark blue colour appears. By dropping iodine solution on the leaves, we can check the presence of starch.

4.    In plants , the synthesis of food occurs by process called photosynthesis. During  photosynthesis, chlorophyll containing cells of the leaves use carbon dioxide and water to synthesize carbohydrates in the presence of sunlight. The process can be represented by an equation:

During this process oxygen is released. The carbohydrates formed ultimately get converted into starch.


6.    Fill in the blanks:

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

(b) The food synthesized by the plants is stored as

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

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

7.    (i) Cuscuta

(ii) Pitcher plant

(iii) Stomata

8.    (a) (ii) parasite

(b) (iii) Pitcher plant


10.  (i) F

(ii) F

(iii) T

(iv) T

11.  (ii) Stomata

12.  (iv) leaves.