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Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS

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How many mitotic divisions are strictly required for the nucleus of a functional megaspore to develop into a mature 8-nucleate female gametophyte?

  1. One meiotic and three mitotic divisions
  2. Three sequential mitotic nuclear divisions
  3. Seven mitotic divisions
  4. Two sequential mitotic divisions

Correct answer · Option 2

Three sequential mitotic nuclear divisions

Explanation

1 functional megaspore nucleus divides mitotically (1st division) -> 2 nuclei -> (2nd division) -> 4 nuclei -> (3rd division) -> 8 nuclei. Thus, 3 sequential mitotic divisions occur.

Related questions

Consider the following statements regarding seeds: Statement I: Albuminous seeds retain a part of the endosperm as it is not completely consumed during embryo development. Statement II: In non-albuminous seeds such as castor and maize, the endosperm is completely consumed during embryo development. In the light of the above statements, choose the correct answer:→Read the following statements about pollination by water: Statement I: Pollination by water is quite common in flowering plants and occurs in over 200 genera of both dicots and monocots. Statement II: The distribution of some bryophytes and pteridophytes is limited because of the requirement of water for transport of male gametes and fertilisation. Choose the correct option:→In the given three-dimensional cut section of an anther, which structure is responsible for the release of pollen grains upon maturity?→In angiosperms, what is the primary biological significance of the delay in zygote division until a certain amount of endosperm has developed?→
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