Home
Class 11
BIOLOGY
On germination a speed first produces sh...

On germination a speed first produces shoots with leaves , flowers apperar late
A. why do you thin this happens?
B.How is this advantageous to the plant?

Text Solution

Verified by Experts

A. As soon as seed germinaltes the plant enters into vegatative growth period .This period takes light stimulus (a critical length of light exposed to different plant i.e phtoperiod) andsynthesise the florigen (a flowering hormone ) which induce flowering
B. The vegetative growth period prepares the plant to belar preproductive structures like flower fruits and seed s adn allows it to grow mature and reproduce
Promotional Banner

Topper's Solved these Questions

  • PLANT GROWTH AND DEVELOPMENT

    NCERT EXEMPLAR|Exercise Long Answer Type Question|3 Videos

  • PLANT GROWTH AND DEVELOPMENT

    NCERT EXEMPLAR|Exercise Very Short Answer Type Question|13 Videos

  • PHOTOSYNTHESIS IN HIGHER PLANTS

    NCERT EXEMPLAR|Exercise Long Answer type Question|13 Videos

  • PLANT KINGDOM

    NCERT EXEMPLAR|Exercise LONG ANSWER TYPE QUSTIONS|5 Videos

Similar Questions

Explore conceptually related problems

(a ) Draw a labelled L.S. view of an albuminous 'seed'· (b) How are seeds advantageous to flowering plants ?

(a) Suppose the windings og the armature in the d.c. motor or Example 4 connot tolerate a current of more than 20 amp. WhaT do you think will happen if the armature gets jammed and cannot rotate when the motor is connected to the supply ? (b) If the supply connection of the d.c. motor in Ex. are removed and the motor is used as a generated by connecting the shaft of its armature to an external mechanical rotor of speed 3000 r.p.m., how much e.m.f. will be generated ?

A particular garden pea plant produces only violet coloured flowers. (a) It is homozygous dominant for the trait of heterozygous? (b) How would you ensure its genotype ? Exaplain with the help of crosses.

While walking through garden , Kapil plucked the tips of some flowering plants. Gardner saw him doing this and persuaded him not to do so as it is not good for plant growth. (i) What happens to the plants if their tips are removed ? (ii) What are meristems ? (iii) How meristems are classified ? (iv) What value was displayed by the garden ?

Mohini, a resident of Chandigarh went to Shimla with her parents. There she same plant that they have in their backyard, at home. However, she observed that while the plants in their backyard bore white flowers, those in Shimla had pink flowers. She brought home some seeds of the plant from Shimla and planted them in Chandigarh. Upon performing self breeding for several generation she found that the plant from Shimla produced only white flowers. (a) According to you what might be the reason for his observation-genetic or eavironmental factors ? (b) Suggest a simple experiment to determine whether this variation is genetic in nature (c) Suggest another experiment to check whether this variation in flower color is due to environmental factors

NCERT EXEMPLAR-PLANT GROWTH AND DEVELOPMENT -Short Answer Type Question
  1. Nicotiana tobacum, a short day plant , when exposed toi more than crit...

    Text Solution

    |

  2. What are the structural characteristics of (a) meristematic cells ne...

    Text Solution

    |

  3. Does the growth pattern in plants differ from that in animals? Do all ...

    Text Solution

    |

  4. Explain in 2-3 lines each of the following terms with the help of exam...

    Text Solution

    |

  5. Auxins are growth hormones caplable of promoting cell elongation. They...

    Text Solution

    |

  6. The role of ethylene and abscissic acid is both positive and negative ...

    Text Solution

    |

  7. While experimentation , why do you think it is difficultto assign any...

    Text Solution

    |

  8. What is the mechanism underlying the phenominon by which the terminal/...

    Text Solution

    |

  9. In animals , there are glands secreting hormones , formed ? How are th...

    Text Solution

    |

  10. Many discoveries in science have been accidental .This is true for pla...

    Text Solution

    |

  11. To get a carpet like garas lawns are mowed regularly.Is there any sci...

    Text Solution

    |

  12. In a slide showing different types of cells can you identify which typ...

    Text Solution

    |

  13. A rubber band stretches and reverts back to its original position. Bub...

    Text Solution

    |

  14. Label the diagram A.This is which part of a dicotyledonous plants? ...

    Text Solution

    |

  15. Both animals and plants grow. Why do we say that growth and diffeentit...

    Text Solution

    |

  16. Define parthenocarpy . Name the plant hormone used to induce parthenoc...

    Text Solution

    |

  17. While eating watermelons, all of us wish it was seedless,. As a plkant...

    Text Solution

    |

  18. A gardener finds some broad leaved dicotweeds growing in his lawns wha...

    Text Solution

    |

  19. On germination a speed first produces shoots with leaves , flowers app...

    Text Solution

    |

  20. Fill in the blanks A. Maximum growth is observed in ………..phase. B....

    Text Solution

    |