Question

1. Why do organisms need to take food?
2. Distinguish between a parasite and a saprotroph.
3. How would you test the presence of starch in leaves?
4. Give a brief description of the process of synthesis of food in green plants.
5. Show with the help of a sketch that the plants are the ultimate source
of food.​

Answer 1

Explanation:

Organisms need to take food becauseorganisms need energy to perform any activity or function and they get energy from food. ... ...

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

The presence of starch in leaves can be tested by the Iodine test.

Answer 2

Answer:

1. Organisms need to take food to get energy and perform life processes. A living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, circulation of blood, and reproduction. To perform all these life processes the organism needs energy and nutrients.
2. Q2) Distinguish between a parasite and a saprotroph. 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.
3. Starch testing
4. 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)
5. The process by which plants make food is photosynthesis. Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas. Chlorophyll is a substance in all green plants, especially in the leaves.
6. Photosynthesis is the process synthesis of food in the plants with the help of chlorophyll and carbon dioxide in the presence of sunlight. ... Show with the help of a sketch that the plants are the ultimate source of food. Answer. The food chain shows that the plant is the ultimate producer.