a. What are plastids? b. Why are chloroplast found only in plant cells? c. What is the role of chlorophyll in photosynthesis?
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a ans--any of a class of small organelles in the cytoplasm of plant cells, containing pigment or food.
b ans--Chloroplast is specific to plant cell because plants are the autotrophs which can prepare their food by conversion of light energy to chemical energy. It is the vital photosynthetic pigment in leaves as it involves the conversion of light energy into chemical energy.
c ans--Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide (absorbed from the air) and water into glucose, a type of sugar.
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