Question

1.Why do organisms take food?
2. Distinguish between a parasite and a saprotroph.
3 How would you test the presence of starch in leaves​

Answer 1

Organisms need to take food to get energy and perform life processes. ... To perform all these life processes, the organism needs energy and nutrients. The energy to the organism is supplied through food. Food intake helps to perform all the activities and develops immunity to fight against infectious diseases.

Organisms which derive nutrition from the body of other living organisms (host) are called parasites. Organisms which derive nutrition from dead and decaying matter are called saprotrophs.

Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)

please mark me brain mark list

Answer 2

Answer:

1. Organisms take food to meet the requirement of energy for various activities.

2. A parasite such as cuscuta derives it's food from the body the host plant or animal. Whereas a saprotroph like a fungus derives its food from the dead and decaying matter.

3. a) Crush a few leaves with a little water.

b) Filter it through a filter paper and collect the filtrate In a test tube.

c) Add few drops of iodine solution.

d) If the solution turns deep blue, the presence of starch in the leaves is confirmed.