Home
Class 12
BIOLOGY
[Aj: ABA plays an important role in plan...

[Aj: ABA plays an important role in plants during water stress and drought conditions.
[R]: Exogenously applied ABA promotes stomatal closing.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • Plant Morphology & Reproduction

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|64 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATIONS

    TRUEMAN BIOLOGY|Exercise MCQs|341 Videos

Similar Questions

Explore conceptually related problems

Which mechanism plays an important role in transportation of water in plants ? (i) during day time, (ii) at night.

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. Which hormone is synthesized at the shoot - tip of plant body ?

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defenses, promoting the plant to quickly build a bigger root system to access deep soil moisture. To be effective this phytohormone should be at an early stage of development. What are phytohormones ?

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. "Plant hormones help to co - ordinate growth." Justify the statement by giving three examples.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Vernalization is also called as yarovization. [R]: In short day...

    Text Solution

    |

  2. [A]: Fundamental factor in the vernalization is low temperature. [R...

    Text Solution

    |

  3. [Aj: ABA plays an important role in plants during water stress and dro...

    Text Solution

    |

  4. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

    Text Solution

    |

  5. [A]: The germination of lettuce seeds is stimulated by red light and i...

    Text Solution

    |

  6. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

    Text Solution

    |

  7. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

    Text Solution

    |

  8. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

    Text Solution

    |

  9. [A]: Wilting occurs due to loss in turgidity. [R]: Turgor pressure c...

    Text Solution

    |

  10. [A]: Plasmolysis is seen by both living and dead cells. [R]: Both ty...

    Text Solution

    |

  11. [A]: The water is absorbed by the root and moves into the stem. [R]...

    Text Solution

    |

  12. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

    Text Solution

    |

  13. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

    Text Solution

    |

  14. [A]: The nitrogen content of the plant cannot be detected accurately b...

    Text Solution

    |

  15. [A]: Submerged plants, get CO2 in-the form of CO3^(-) & HCO3^(-3) [R...

    Text Solution

    |

  16. [A]: The evolution of molecular oxygen is concerned with photosystem-1...

    Text Solution

    |

  17. [A]: Antitranspirants are material applied to plants for retarding tra...

    Text Solution

    |

  18. Assertion. Calcium deficiency symptoms first appear in the apical regi...

    Text Solution

    |

  19. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

    Text Solution

    |

  20. Assertion : Water and mineral uptake by root hairs from the soil occur...

    Text Solution

    |