PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The chlorophyll in the leaves is breaking down.
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The chlorophyll in the leaves is growing.
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The plant is old.
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The plant is dying.
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Detailed explanation-1: -But in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.
Detailed explanation-2: -As the weather cools in autumn, the leaves start to receive less sunlight. Less sunlight triggers chlorophyll to break down (and the tree does not replenish it) revealing the new, colourful pigments underneath and treating us to beautiful autumn yellows and oranges.
Detailed explanation-3: -As night length increases in the autumn, chlorophyll production slows down and then stops and eventually all the chlorophyll is destroyed. The carotenoids and anthocyanin that are present in the leaf are then unmasked and show their colors.
Detailed explanation-4: -► Chlorophyll is broken down in a multi-step pathway called PAO pathway. ► The PAO pathway operates during leaf senescence and fruit ripening. ► The end products of the pathway are fluorescent and nonfluorescent catabolites. ► The pathway aims to detoxify chlorophyll, but may also have physiological roles.
Detailed explanation-5: -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.