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What causes a green plant exposed to the...

What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows ?

A

Light stimlates plant cells on the lighted side to grow faster

B

Auxin accumulates on the shaded side , stimulating

C

Green plants need light to perform photosynthesis

D

Green plants seek light because the are phototropic .

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The correct Answer is:
B
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The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards the source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R. State whether P prefers to remain in the sunlit side of a stem or in shade.

The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards the source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R. What is the chemical substance P ?

The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards the source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R. What is the effect of substance P on the rate of growth of (a) a root and (b) a stem?

AAKASH SERIES-PLANT GROWTH AND DEVELOPMENT -EXERCISE -III (PREVIOUS AIPMT/NEET QUESTIONS)
  1. The Avena curvature is used for bioassay of

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  2. Auxin can be bioassayed by

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  3. What causes a green plant exposed to the light on only one side, to be...

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  4. Typical growth curve in plants is

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  5. Which one of the following growth regulators is known as stress hormot...

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  6. Dr. F. Went noted that if coleoptile tips were removed and placed on a...

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  7. During seed germination its stored food is mobilized by

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  8. Vernalisation stimulates flowering in

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  9. Through their effect on plant growth regulators, what do the temperatu...

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  10. Which one of the following generally acts as an antagonist to gibberel...

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  11. Root development is promoted by -

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  12. One of the commonly used plant growth hormone in tea plantation is

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  13. Coiling of garden pea tendrils around any support is an example

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  14. Phototropic curvature Is the resutt of uneven distribution of

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  15. Which one of the following acids is a derivative of carotenoids?

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  16. One of the synthetic auxin is

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  17. Senescence as an active developmental cellular process in the growth a...

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  18. Importance of day length ( photoperiodism ) in flowering of plants was...

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  19. The wavelength of light absorbed by Pr form of phytochrome is (A) 680...

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  20. Which one of the following pairs is not correctly matched ?

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