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Question

92. Which of the following types of light are strongly absorbed by plants?

A
Violet and orange
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B
Blue and red
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C
Indigo and yellow
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D
Yellow and violet
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Solution

The correct option is B Blue and red

Out of the seven colours of light, only red and blue are absorbed by plants. Photosynthesis is the process by which green plants trap solar energy and convert it into chemical energy of carbohydrates. Photosynthesis is the only source of energy for all organisms. The light reaction occurs in the grana of cells' chloroplast and in this reaction, 0, is liberated, ATP and NADPH is formed. Leaf is the major organ of photosynthesis in plants. All green parts of the plant have chloroplasts.
Chloroplasts are enveloped by double membrane enclosing stroma, in which grana are present. The granum contains pigment such as chlorophyll. Photosynthesis involves two distinct phases; Photo-chemical phase (light reactions) and biosynthetic phase (dark reactions).
The light reaction occurs in the grana of cell's chloroplast and in the reaction, O, is liberated ATP and NADPH2 is formed. The dark reaction occurs in the stroma of chloroplast and CO, absorbed from the atmosphere is reduced to make carbohydrate. Because the colour of chlorophyll is green, so it strongly absorbs blue and red colours of electromagnetic spectrum of the Sun.


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