4. How will you test the presence of starch in the leaf? 

Ans: 1.Boil leaf in water to kill cells.

  1. Boil leaf in alcohol to remove chlorophyll.
  2. Wash leaf with water to soften it.
  3. Add iodine solution to leaf.
  4. Blue‑black colour indicates starch presence.
5. Why is plantation important?  

Ans: Plantation gives us clean air, food, and shelter. It keeps our environment healthy and protects animals.

Give one word.
(i) holes through which gases exchange takes place leaves.: Stomata

(ii) pipe by which water and mineral salts are transported to the leaves.: Xylem

(iii) A type of fungus which is eaten.: Mushroom

Tick the correct or false statements in the following:

(a) Oxygen gas is released in photosynthesis. True

(b) Such plants, which synthesize their food themselves, are called parasites. False

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

(d) In photosynthesis, solar energy is converted into chemical energy. True

(e) Insectivorous plants make their food by photosynthesis. True