Home
Class 12
BIOLOGY
Assertion :- ABA is stress hormone. R...

Assertion :- ABA is stress hormone.
Reason:- ABA causes abscission of old leaves and fruits.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PLANT GROWTH AND DEVELOPMENT

    MOTION|Exercise Exercise - 3|28 Videos

  • PHOTOSYNTHESIS IN HIGHER PLANTS

    MOTION|Exercise Exercise - 4 (ASSERTION & REASON QUESTIONS)|33 Videos

  • PLANT KINGDOM

    MOTION|Exercise Check your concepts -1|16 Videos

Similar Questions

Explore conceptually related problems

Ethylene retards abscission of leaves, flowers and fruits.

Assertion : Auxins help to prevent fruits and leaves droo at early stages. Reason : Auxins promote the abscission of older mature leaves and fruits.

The primary hormone causing abscission of leaves is

Assertion : Abscisic acid (ABA) is also called stress hormone. Reason : ABA increases the tolerance of plants to various kinds of stresses.

Why ABA is called stress hormone in plants?

Hormone antagonistic ABA is

How many of the following are correct regarding plant hormone ABA? Br a- Inhibition of seed germination, br b-Stress hormone, c- Acceleration of abscission of flowers & fruit. Br d - Anti - GA, br e- Respiratory climactic.

Assertion (A): Abscisic acid is a stress hormone. Reason (R): Stimulation of ABA occurs in adverse conditions.

They help to prevent fruit and leaf drop of early stages but promote the abscission of older mature leaves and fruits. Above statement is related with

MOTION-PLANT GROWTH AND DEVELOPMENT-Exercise - 4
  1. Assertion :- Environmental signals such as light and gravity also affe...

    Text Solution

    |

  2. Assertion :- Oxygen is compulsory for growth Reason:- Oxygen is mus...

    Text Solution

    |

  3. Assertion :- The act leading to maturation is known as differentiation...

    Text Solution

    |

  4. Assertion :- Beside growth, differentiation in plants is also open. ...

    Text Solution

    |

  5. Assertion :- Development is a broad and extensive aspect of the life o...

    Text Solution

    |

  6. Assertion :- Buttercup produces two different kind of leaves within th...

    Text Solution

    |

  7. Assertion :- Growth regulators are intrinsic and intercellular factors...

    Text Solution

    |

  8. Assertion :- Auxins help to prevent fruit and leaf drop at early stage...

    Text Solution

    |

  9. Assertion :- 2,4-D is one of the selective weedicide. Reason:- 2,4-...

    Text Solution

    |

  10. Assertion :- GA3 is used to speed up the malting process in brewing in...

    Text Solution

    |

  11. Assertion :- Spraying of gibberellin leads to early seed formation in ...

    Text Solution

    |

  12. Assertion :- Kinetin is synthetic cytokinin. Reason:- Kinetin was o...

    Text Solution

    |

  13. Assertion :- Cytokinins helps in the delay of leaf senescence. Reas...

    Text Solution

    |

  14. Assertion :- Ethylene increases the yield of cucurbits. Reason:- Et...

    Text Solution

    |

  15. Assertion :- ABA is stress hormone. Reason:- ABA causes abscission ...

    Text Solution

    |

  16. Assertion :- In day neutral plants there is no correlation between exp...

    Text Solution

    |

  17. Assertion :- Flowering in plants depends only on a combination of ligh...

    Text Solution

    |

  18. Assertion :- LDPs without leaf are unable to flower. Reason:- Leave...

    Text Solution

    |

  19. Assertion :- Vernalisation prevents precocious reproductive developmen...

    Text Solution

    |

  20. Assertion :- Winter varieties of wheat & rye are planted in autumn not...

    Text Solution

    |