Home
Class 12
BIOLOGY
[A]: Senescence is induced by the applic...

[A]: Senescence is induced by the applica- tion of cytokinin in plants.
[R]: Cytokinin promotes the breakdown of chlorophyll, proteins and nucleic acid.

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:
D
Promotional Banner

Topper's Solved these Questions

  • Plant Morphology & Reproduction

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|59 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATIONS

    TRUEMAN BIOLOGY|Exercise MCQs|322 Videos

Similar Questions

Explore conceptually related problems

Assertion: Deficiency of sulpur causes chlorosis in plants Reason : Sulphur is a constituent of chlorophyll, proteins and nucleic acids.

[A] : Virion is the virus particle outside the host cell. [R] : They contain only proteins and no nucleic acids .

The following statements are given about different plant growth hormones : I. Cytokinin suppresses the synthesis of chlorophyll. II. Auxins control apical dominance. III. Gibberellins promote shoot elongation. IV. Abscisic acid enables seeds to withstand desication. Which of the above statements are correct?

[A]: In Nepenthes, lamina is modified to cap- ture insects to get nitrogenous food. [R]: The plant proteins are broken down to amino acids and then absorbed by plant.

[A] : Cytokinins help in the retention of chloro- phyll and delay senescence in leaves. [R]: Cytokinins only stimulate root initiation

Identify the correct statement regarding cytokinins. I. Cytokinins induce cell division . II. Cytokinins delay the onset of senescence. III. Cytokinins initiate chloroplast formation in the presence of light . IV. Application of Cytokinins reduces the apical dominance and stimulates the growth of lateral buds.

The process of senescence in plants involves I. decrease in nucleic acid and protein contents. II. Reduced photosynthetic and storage activity. III. Breakdown of photosynthetic pigments. IV. Increased mitochondrial activity.

Read the given statements about auxins and state whether they are true or false : a. Auxin promotes apical dominance. b. Auxins have a negative impact on cytokinin levels. c. F.W went isolated auxins from the coleoptiles of the coleptiles of the oat plant. d. Auxin promotes flowering in the pineapple plants.

Study the following statements. I. Ethylene and ABA hormones accelerate the process of senescence. II. Zeatin is physiologically active cytokinins is maize kernels. III. Arginine is precursor for auxin biosynthesis. IV. Auxin induces cell division. Choose the correct option.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. Assertion: Sigmoid growth curve consists of four parts. Reason : La...

    Text Solution

    |

  2. [A] : 2,4-D is a herbicide [R] : It is not used during showing of cr...

    Text Solution

    |

  3. [A] : Nastic movements occur in the directions of stimuls [R] : "Tou...

    Text Solution

    |

  4. [A] : Germinating seeds which store fats as reserve food material are ...

    Text Solution

    |

  5. [A] : Gibberellic acid , when added to isolated aleurone , induce amyl...

    Text Solution

    |

  6. [A] : When apical bud is removed, the next axial bud begins to grow ou...

    Text Solution

    |

  7. [A]: Xanthium will not flower if the long dark period is interrupted b...

    Text Solution

    |

  8. [A]: Senescence is induced by the applica- tion of cytokinin in plants...

    Text Solution

    |

  9. Assertion : A correct concentration of auxin and cytokinin is required...

    Text Solution

    |

  10. [A]: The endogenous level of plant hormones is measured by Bioassay te...

    Text Solution

    |

  11. [A] : Bolting of rosette plants is caused by Gibberellins. [R]: Gibb...

    Text Solution

    |

  12. [A] : Cytokinins help in the retention of chloro- phyll and delay sene...

    Text Solution

    |

  13. [A]: Plants hormones are called phytohor- mones [R]: They increase ...

    Text Solution

    |

  14. [A] : Senescence occurs in all non meristematic cells. [B]: Meristem...

    Text Solution

    |

  15. Assertion . Senescence is the time when age associated defects are man...

    Text Solution

    |

  16. Assertion: Photosynthetically C(4) plants are less efficient than C(3)...

    Text Solution

    |

  17. Assertion. The atmospheric concentration of CO(2) at which photosynthe...

    Text Solution

    |

  18. Asserotion: C(4) photosynthetic pathway is more efficient than the C(3...

    Text Solution

    |

  19. Assertion : Photomorphogenetic responses are controlled by the pigment...

    Text Solution

    |

  20. [A] : Some plants flower only in summers & some only in winters. [R]...

    Text Solution

    |