Question

The starch is produced in the part of the leaf of the plant which is
A. Exposed to light
B. Covered with black paper
C. Kept in a closed dark room
D. Watered daily

Answer 1

Hint: Starch is a polysaccharide made up of glucose units. It is obtained as a product of the photosynthesis. Photosynthesis is a process of the production of food by plants by utilizing sunlight, carbon dioxide, and water.

Complete answer: Starch is the energy source for plants to grow and sustain. It is stored by plants in the form of starch. It is a polysaccharide made up of repeating units of glucose. The starch is the final product of the process of photosynthesis. Plants are autotrophs and thus produce their food on their own. Photosynthesis is a process that utilizes sunlight, carbon dioxide, and water to produce food for the plant. Sunlight fuels the photosynthesis process by providing light energy. The light energy provided is converted into chemical energy with the help of chloroplast present in the plant. The chloroplast is the green pigment present in leaves majorly. It cannot perform photosynthesis without sunlight. Therefore, the plant parts covered with black paper cannot perform photosynthesis and thus no starch can be found in these parts. Also, plants kept in dark rooms are also devoid of sunlight and thus starch cannot be found in the leaves of this plant. Hence, the plant which is exposed to light will have starch in the leaves of their plant. This is because it can perform photosynthesis due to the presence of sufficient sunlight. Water plays an important role in plant development.
So, the correct answer is option A.

Note: Certain plants can live without water and sunlight for a long period of time. These plants undergo dormancy. But on providing normal conditions these plants can be revived. These are called resurrection plants.