Tag: pre fertilization - plants

Questions Related to pre fertilization - plants

Which one shows meiosis?

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Root tip

  2. Archesporium

  3. Pollen grain

  4. Anther

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Correct Option: D

Meiotic division occurring just at the time of gametogenesis is 

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Sporic

  2. Initial

  3. Intermediate

  4. Terminal

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Correct Option: D
Explanation:

  • In plants, meiosis is occurring as in diploid sporophyte to produce haploid spores. 
  • The haploid spores are germinating to produce structures called gametophytes. The gametophytes then produce gametes. 
  • Gametic or the terminal meiosis occurs in all multicellular animals. It takes place in the gonads and hence as results in the formation of gametes. 
  • It is responsible for gametogenesis and does not give rise to gametophytes.
  • The correct option is D.

Development of female gametophyte directly from megaspore mother cell without meiosis is called.

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Apogamy

  2. Apospory

  3. Syngamy

  4. Parthenospore

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Correct Option: B

Formation of gametophyte directly from sporophyte without meiosis is?

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. Apospory

  2. Apogamy

  3. Parthenogenesis

  4. Amphimixis

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Correct Option: A

Read the given statements.


(i) The outer exine is made up of sporopollenin.
(ii) Inner intine is pecto-cellulosic in nature.
(iii) Generative cell is bigger and contains abundant food reserve.
(iv) Vegetative cell is small and floats in the cytoplasm of the generative cell.

Which of the given statements are not true regarding the structure of pollen grain?

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (i) and (iv)

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Correct Option: C
Explanation:

In a mature pollen grain, the generative cell is smaller and the tube(or vegetative) cell is larger. In the later stages of development of pollen grain, callose dissolves and the naked generative cell comes to lie freely in the cytoplasm of the tube cell. The tube cell has a cytoplasm that is rich in the food reserve (starch, protein, fat with mostly unsaturated fatty acids).

Sporic meiosis occurs in

botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

  1. Animals

  2. Thallophyta

  3. Bryophyta

  4. All plants except thallophyta

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Correct Option: D
Explanation:

Sporic meiosis, has mitosis in two stages, both the diploid and haploid stages, termed diplobiontic. 

Sporic meiosis occurs in all plants except thallophyta. In sporic meiosis, the division by mitosis happens to create a multicellular diploid organism, the sporophyte. Some of the cells of the sporophite then produce spores through a sporic meiosis. In this case, the meiosis is sporic (because it produces spores). The spores then produce a haploid gametophyte which, in turn, will produce the gametes through mitosis. 

$32$ chromosomes are present in the green leaf of Onion. When meiosis takes place to produce gametes after fertilization how many chromosomes will be there in triploid nucleus.

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. $32$

  2. $16$

  3. $48$

  4. $9$

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Correct Option: C