Home
Class 12
BIOLOGY
[A]: Auxins are found in large amounts i...

[A]: Auxins are found in large amounts in the apical Meristem of shoot.
[R]: Because the shoot is exposed to the sunlight.

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

The apical meristem of shoot apex is

[A] : Anemophillous plants have to produce enormous quantities of pollen. [R] : Because during the transit of pollen through a wind, a considerable amount of pollen is lost.

[A]: Xylem transports sap from root to shoot. [R]: Phloem translocates food.

State how concentration of auxins stimulates the cells to grow longer on the side of the shoot which is away from the light

[A] : When apical bud is removed, the next axial bud begins to grow out. [R]: High concentration of auxin in the apical bud suppresses the growth of next axial bud.

[A]: Rubber is obtained from the latex of Hevea brasiliensis. [R]: Because secretory canals are abun- dantly found in the secondary phloem

[A] : Macrophage is a large amoeboid cell that can engulf, ingest and destroy bacteria, dam- aged cells and worn-out red blood cells. This process is called phagocytosis and is an im- portant part of the body s defence against disease. [R]: Macrophages are found free (wandering) in the tissues, in connective tissue) as histio- cytes), in the lining of the blood sinusoids of the liver (as Kupffer cells), and in lymphoid tissue. They make up the reticulo-endothelial system.

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 ?

Assertion : A correct concentration of auxin and cytokinin is required for the development of root and shoot in callus. Reason: When the ratio of kinetin to auxin is high only shoot develop but when the ratio is low only roots develop

P, Q, R and S are four major types of phytohormones. P is a phytohormone which functions mainly as a growth inhibitor. It promotes the wilting and falling of leaves. Q, R and S are phytohormones which all promote growth of plant in various ways like Q is responsible for the phototropism in plants while Ris involved mainly in shoot development. The phytohormone S helps in breaking the dormancy of seeds and buds. What is P, Q, R and S.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: In Nepenthes, lamina is modified to capture insects to get nitrog...

    Text Solution

    |

  2. [A]: The downward· movement of minerals through soil is effected by qu...

    Text Solution

    |

  3. [A]: Auxins are found in large amounts in the apical Meristem of shoot...

    Text Solution

    |

  4. [A]: In C4 plants, CO2 fixation occurs at three sites. [R]: CO2 is f...

    Text Solution

    |

  5. [A]: Oxidation of H2O takes place during pho- tosynthesis. [R]: Ph...

    Text Solution

    |

  6. [A]: The rate of photosynthesis is determined in terms of the rate of ...

    Text Solution

    |

  7. [A]: The energy capturing part of photosynthesis occurs in thylakoid m...

    Text Solution

    |

  8. [A]: The light dependent reactions occur in thylakoids. [R]: In thyl...

    Text Solution

    |

  9. [A]: Tropical movements occuring in response to water stimulus are cal...

    Text Solution

    |

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

    Text Solution

    |

  11. [A]: Hill and Bendall proposed Z-scheme and suggested that photosystem...

    Text Solution

    |

  12. [A]: Rhizobial aggregates have been ob- served at distinct sites on cu...

    Text Solution

    |

  13. [A]: Light is very important external factor of transpiration. [R]:...

    Text Solution

    |

  14. [A]: Wax, resin and suberin coating on the surface of plant parts redu...

    Text Solution

    |

  15. [A]: Gibberellic acid when added to isolated aleurone layer, induces a...

    Text Solution

    |

  16. Assertion : Auxillary buds, in actively growing herbaceous plants, gen...

    Text Solution

    |

  17. Assertion : If you burn a plant , its nitrogen component is given of...

    Text Solution

    |

  18. [A]: Amino acids are converted into ammonia by a group bacteria called...

    Text Solution

    |

  19. [A]: Due to excessive use of fertilizers, the available water to the p...

    Text Solution

    |

  20. [A]: Vernalization is also called as yarovization. [R]: In short day...

    Text Solution

    |