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Abscisic acid causes...

Abscisic acid causes

A

Faster leaf fall

B

Dormancy of buds and seeds

C

Retardation of growth

D

All the above.

Text Solution

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The correct Answer is:
D
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Stomatal movements are influenced by a number of environmental factors, Which of the following statements is // are incorrect regarding this? (ii)Blue light keeps stomata open during the day pormoting the movement of K_(+) ions into guard cells. (ii) Increased CO_(2) concentraation reduces the pH of guard cells which promotes conversion of sugar into starch ultimately causing closure of stomata. (iii) Abscisic acid under stress conditions, causes repid movement of K_(+) ions into guard cells. Highly concentrated sucrose or salt solution when applied over to stomata results in stomata opening.

DINESH PUBLICATION ENGLISH-Plant Growth and Movements-RQ
  1. Gibberellins can promote seed germination because of their influence o...

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  2. Assertion.Plant growth regulators are very important for plant growth ...

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  3. Abscisic acid causes

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  4. The characteristics like expansion, breaking dormancy, promoting germi...

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  5. Which amongst the following is a natural growth regulator

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  6. 6-(4-Hydroxy-3 Methyl-trans-2-butenylamine) purine is also called

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  7. Cholodony and Went effect is due to (a) IAA (b) GA (c) Cytokinin ...

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  8. The hormone which reduces transpiration rate by inducing stomatal clos...

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  9. Bolting means

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  10. Phytochrome responsible for flowering is

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  11. The primary and secondary growth of a shoot inhibited by

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  12. The pigment that absorbs red and far-red light in plants, is

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  13. Which one is correct for blooming of short day plants

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  14. Select the correctly matched pair

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  15. One hormone stimulates the closure of stomata and another one influenc...

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  16. Which of the following statements regarding photoperiodism is false

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  17. The hormone that promotes rapid elongation of intermodes or leaf base ...

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  18. Assertion (A). Ethylene induces ripening Reason (R). Ethylene is a g...

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  19. Identify the correct pair of combination (i) Zeatin - adenine deriva...

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  20. Match the columns and find the correct option {:("(a) Munch"," (...

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