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The annular and spirally thickened condu...

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

A

Differentiating

B

Maturing

C

Elongating

D

Widening

Text Solution

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The correct Answer is:
B
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MOTION-PLANT GROWTH AND DEVELOPMENT-Exercise - 3
  1. One of the synthetic auxin is

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

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  3. The annular and spirally thickened conducting elements generally deve...

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  4. Phototropic curvature is result of uneven distribution of

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  5. Photoperiodism was first characterized in

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  6. Root development is promoted by

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

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  8. Vernalisation simulates flowering in

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  9. Through their effect on plant growth regiulators, what do the temperat...

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  10. Dr. F. Went noted that is coleoptile tips were removed and placed on a...

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  11. A few normal seedlings of tomato were kept in a dark room. After few d...

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  12. Which one of the following growth regulators is known as 'stress hormo...

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  13. The rate of growth of any organism follows Or Typical growth curve...

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

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  15. Auxin can be bioassayed by

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  16. The Avena curvature is used for bioassay of

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  17. You are given a tissue with its potential for differ- entiation in an ...

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  18. Fruit and leaf drop at early stages can be prevented by the applicatio...

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  19. It takes very long time for pineapple plants to produce flowers. Which...

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  20. What is the site of perception of photoperiod necessary for induction ...

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