Question

1.why do organisms need to take food?
2.how would you test the presence of starch in leaves?

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Answer 1

Answer:

1. Organisms need to take food, which gives them energy to live and work and to carry out various processes inside the body.

2. The presence of starch in leaves can be tested by growing a plant with starch and a plant without starch. The presence of starch will be justified when the plant with starch grows, and the plant without starch does not grow.

Explanation:

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Answer 2

1. Organisms take food to meet the requirements of energy for various activities of their body.
2. crush a few leaves with a little water. filter it through a filter paper and collect the filtrate in a test tube. add few drops of iodine solution. if the solution turns deep blue, the presence of starch in the leaves is confirmed.

Explanatation:

1. food is the basic source of energy for all organisms.The process of taking food by an organisms and its utilizatation by the body is called nutrition.
2. The portion of the leaf exposed to sunlight becomes blue–black, whereas that covered with aluminium foil does not show any colour change.

• Take a potted plant and cover a part of one of its leaves with aluminium foil.
• place the plant in sunlight.
• pluck the leaf after a few days and remove the aluminium foil from it.