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The cause of dormancy for sometime in fertilized ovule is -
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The cause of dormancy for sometime in fertilized ovule is -

A
Presence of hormone, Auxin.

B
Zygote divides only after certain amount of endosperm is formed

C
Presence of growth inhibitor ABA.

D
Presence of least amount of water.

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Dr. Ali Objective Biology

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Most of the zygotes in angiosperms divide only after certain amount of endosperm is formed because it is the nutrition which the zygote will need at the time of maturation.
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Practice questions from Dr. Ali Objective Biology

Question 1
Easy
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Why and are genetically identical?
  1. Because they are products of meiosis
  2. Because they are products of mitosis
  3. Because they are products of meiosis
  4. Because they are products of amitosis
Topic

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Sexual Reproduction in Flowering Plants

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Dr. Ali Objective Biology

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Question 2
Easy
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The ability of the pistil to recognize the pollen followed by its acceptance or rejection is the result of a continuous dialogue between pollen grain and the pistil.
This dialogue is mediated by chemical component, of the pollen interacting with those of the pistil. Which of the following chemicals mainly takes part in the interaction -
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  2. Proteins
  3. Minerals
  4. Lipidorinulin
Topic

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Sexual Reproduction in Flowering Plants

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Dr. Ali Objective Biology

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Question 3
Easy
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One meiosis produces how many male gametes -
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  2. 2
  3. 1
  4. 8
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Sexual Reproduction in Flowering Plants

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Dr. Ali Objective Biology

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Question 4
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Embryos of monocotyledons possess only one ___A____. In the grass family the cotyledon is called ____B___ that is situated towards one side (lateral) of the embryonal axis. At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called ____C___.
The portion of the embryonal axis above the level of attachment of scutellum is the ____D___ which has a shoot apex enclosed in a foliar structure called ____E____.
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  2. A- scutellum, B - cotyledon, C - coleorrhiza, D - epicotyl, E - coleoptile
  3. A - cotyledon, B - scutellum, C - coleorrhiza, D - Hypocotyl, E - coleoptile
  4. A- cotyledon, B - scutellum, C - coleoptile, D - epicotyl, E - coleorrhiza
Topic

Topic:

Sexual Reproduction in Flowering Plants

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(iv) Male gametes are produced in small number.
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While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?
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Question Text
The cause of dormancy for sometime in fertilized ovule is -
TopicSexual Reproduction in Flowering Plants
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes74