Home
Class 12
BIOLOGY
Assertion. The time involved between pol...

Assertion. The time involved between pollination and fertilization varies from species to species
Reason. All the pollen that reach the stigma succeed in affecting fertilization .

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

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • PLANT KINGDOM

    TRUEMEN BIOLOGY ENGLISH|Exercise MULTIPLE CHOICE QUESTION|243 Videos

  • Plant Physiology

    TRUEMEN BIOLOGY ENGLISH|Exercise ASSERTION AND REASON|89 Videos

Similar Questions

Explore conceptually related problems

Time taken in Pinus from pollination to fertilization is

The transfer of the pollen grains from the anther to the stigma of a flower is called fertilization.

Assertion: Complexity of classification increases from kingdom to species Reason. Common characters increase from kingdom to species

Assertion complexity of classification increases from kingdom to species. Reason: Common characters decrease from kingdom to species.

By cross pollinating certain tobacco species, some fertile hybrids were obtained by

Assertion. Species are static units in classification. Reason. Species do not change with time.

Assertion. Species are static units in classification. Reason. Species do not change with time.

Assertion (A) : The phase difference between any two points on a wave front is zero Reason (R ) : Light from the source reaches every point of the wave front at the same time

Assertion : Synergids of embryosac also help in fertilization in Angiosperms. Reason : Obturators of synergids attract the pollen tube.

Assertion : The honey bee queen copulates only once in her life time. Reason : The honey bee queen can lay fertilized as well as unfertilized eggs.

TRUEMEN BIOLOGY ENGLISH-Plant Morphology & Reproduction -ASSERTION AND REASON
  1. [A] : Anemophillous plants have to produce enormous quantities of poll...

    Text Solution

    |

  2. [A] : Bees are colour-blind for red and are fond of yellow, violet and...

    Text Solution

    |

  3. Assertion. The time involved between pollination and fertilization var...

    Text Solution

    |

  4. [A] : The presence of endothelium around the embryo sac and its cytolo...

    Text Solution

    |

  5. [A] : Synergids play an important role in directing the pollen tube gr...

    Text Solution

    |

  6. Assertion. In apomixis , plants of new genetic sequence are produced. ...

    Text Solution

    |

  7. [A] : Nucleus of pollen grain divides meiotically and form a pollen tu...

    Text Solution

    |

  8. [A]: Incompatibility is a gene physiological process. [R]: Moderate...

    Text Solution

    |

  9. [A]: The pollen sterility has been attributed to the malfunctioning of...

    Text Solution

    |

  10. [A]: The three cells of the egg apparatus are arranged in a triangular...

    Text Solution

    |

  11. [A]: Pollen grains from male parent are mostly transferred to the stig...

    Text Solution

    |

  12. [A]: The two sperms cells in a pollen tube often change their shape. ...

    Text Solution

    |

  13. [A] : Synandrous condition is found in curcurbits. [R] : The male fl...

    Text Solution

    |

  14. [A]: In certain plants the stem that twins around the support is hard ...

    Text Solution

    |

  15. [A]: Leaf in Daucus carota is decompound. [R]: Saprophytic and paras...

    Text Solution

    |

  16. [A]: The colour of flowers in Bougainvillia is due to the coloured bra...

    Text Solution

    |

  17. [A]: The endosperm contains the triploid number of chromosomes. [R]:...

    Text Solution

    |

  18. [A]: Spore mother cells within the anther pollen sacs form four haploi...

    Text Solution

    |

  19. [A]: One diploid embryo sac mother cell develops within the nucellus o...

    Text Solution

    |

  20. [A]: Triple fusion results in veg~tative fertiliza- tion of angiosperm...

    Text Solution

    |