OBJECTIVE LIFE SCIENCE
BIOTECHNOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the fall of the year, the days get shorter and trees change colors. Why do leaves change their colors?
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Because they dry up.
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They stop making chlorophyll.
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They become coated with colorful algae.
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The air temperature causes the color change
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Explanation:
Detailed explanation-1: -Trees get less direct sunlight, and the chlorophyll in the leaves breaks down. The lack of chlorophyll reveals yellow and orange pigments that were already in the leaves but masked during the warmer months.
Detailed explanation-2: -But, in the fall, the food factories shut down for the winter. The chlorophyll breaks down and the green fades away, letting the yellow/orange carotenoids blaze forth, giving autumn its splash, dash and panache.
Detailed explanation-3: -As autumn approaches, the tree begins breaking down chlorophyll in the leaves and moving the sugars and starches into storage cells in the twigs. The nitrogen in the chlorophyll also is moved into storage cells.
There is 1 question to complete.