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Assertion: In monosporic development, all four megaspores produced from the megaspore mother cell (MMC) do not contribute to the formation of the female gametophyte.


Reason: Monosporic development results in the formation of four functional megaspores.

  • a)
    Both the assertion and reason are true, and the reason is a correct explanation of the assertion.

  • b)
    Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.

  • c)
    The assertion is true, but the reason is false.

  • d)
    The assertion is false, but the reason is true.

Correct answer is option 'C'. Can you explain this answer?
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Assertion: In monosporic development, all four megaspores produced fro...
Explanation: In monosporic development, only one megaspore out of the four produced from the megaspore mother cell (MMC) develops into the female gametophyte. The other three megaspores typically degenerate. Therefore, the assertion is correct. However, the reason is incorrect as it states that all four megaspores become functional, which is not the case in monosporic development.
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Assertion: In monosporic development, all four megaspores produced fro...
Embryo sac formation from functional megaspore in angiosperms

Angiosperms are flowering plants that produce seeds enclosed in a fruit. The female reproductive organ of angiosperms is the pistil, which consists of the stigma, style, and ovary. The ovary contains ovules, which are the structures that produce female gametes. The process of ovule development starts with the formation of a functional megaspore, which develops into the embryo sac.

Development of functional megaspore:

- In angiosperms, the ovule contains a single functional megaspore mother cell (MMC), which undergoes meiosis to produce four haploid megaspores.
- Three of the four megaspores disintegrate, and the remaining one develops into the functional megaspore.
- The functional megaspore undergoes three rounds of mitotic divisions without cytokinesis, resulting in the formation of an eight-nucleate cell called the embryo sac.

Embryo sac formation:

- The eight-nucleate embryo sac consists of three antipodal cells, two synergids, one egg cell, and two polar nuclei.
- The antipodal cells are located at the opposite end of the embryo sac from the egg cell and play a role in nutrient uptake.
- The synergids are located near the egg cell and help guide the pollen tube to the egg cell during fertilization.
- The egg cell is the female gamete that fuses with the male gamete (sperm) during fertilization to form a zygote.
- The two polar nuclei fuse to form a diploid nucleus, which gives rise to the endosperm, a nutritive tissue that provides nourishment to the developing embryo.

Conclusion:

In angiosperms, the functional megaspore develops into the embryo sac, which contains the female gametes and the endosperm precursor. The process of embryo sac formation involves mitotic divisions without cytokinesis, resulting in the formation of an eight-nucleate cell with specialized cell types that play a role in fertilization and seed development.
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Assertion: In monosporic development, all four megaspores produced fro...
1 diploid megaspore mother cell Undergo meiosis and form 4 haploid megaspores by the process known as Megasporogenesis... ________
Out of which three degenerate and only one becomes functional which give rise to female gametophyte or Embryo sac
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In pteridophytes the sporophyte produces spores through meiosis. The spores are produced by the sporangia in the spore mother cells. These spores germinate to give rise to gametophytes. The gametophytes bear male and female sex organs. Water is required for transfer of antherozoids - the male gametes released from the male sex organ to the mouth of female sex organ. Fusion of male gamete with the egg result in the formation of zygote. Zygote thereafter produces a multicellular well-differentiated sporophyte. In majority of the pteridophytes all the spores are of similar kinds. However, some genera also produce two kinds of spores, macro (larg e) and micro (small) spores. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively. In these plants, the female gametophytes are retained on the parent sporophytes for variable periods. The development of the zygotes develop into young embryos within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution. Direction : In the above questions the Assertions (

In pteridophytes the sporophyte produces spores through meiosis. The spores are produced by the sporangia in the spore mother cells. These spores germinate to give rise to gametophytes. The gametophytes bear male and female sex organs. Water is required for transfer of antherozoids - the male gametes released from the male sex organ to the mouth of female sex organ. Fusion of male gamete with the egg result in the formation of zygote. Zygote thereafter produces a multicellular well-differentiated sporophyte. In majority of the pteridophytes all the spores are of similar kinds. However, some genera also produce two kinds of spores, macro (larg e) and micro (small) spores. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively. In these plants, the female gametophytes are retained on the parent sporophytes for variable periods. The development of the zygotes develop into young embryos within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution.Q. In pteridophytes the dominant form of life is the_______.

In pteridophytes the sporophyte produces spores through meiosis. The spores are produced by the sporangia in the spore mother cells. These spores germinate to give rise to gametophytes. The gametophytes bear male and female sex organs. Water is required for transfer of antherozoids - the male gametes released from the male sex organ to the mouth of female sex organ. Fusion of male gamete with the egg result in the formation of zygote. Zygote thereafter produces a multicellular well-differentiated sporophyte. In majority of the pteridophytes all the spores are of similar kinds. However, some genera also produce two kinds of spores, macro (larg e) and micro (small) spores. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively. In these plants, the female gametophytes are retained on the parent sporophytes for variable periods. The development of the zygotes develop into young embryos within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution.Q. Pteridophytes are __________ plants.

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Assertion: In monosporic development, all four megaspores produced from the megaspore mother cell (MMC) do not contribute to the formation of the female gametophyte.Reason: Monosporic development results in the formation of four functional megaspores.a)Both the assertion and reason are true, and the reason is a correct explanation of the assertion.b)Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.c)The assertion is true, but the reason is false.d)The assertion is false, but the reason is true.Correct answer is option 'C'. Can you explain this answer?
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Assertion: In monosporic development, all four megaspores produced from the megaspore mother cell (MMC) do not contribute to the formation of the female gametophyte.Reason: Monosporic development results in the formation of four functional megaspores.a)Both the assertion and reason are true, and the reason is a correct explanation of the assertion.b)Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.c)The assertion is true, but the reason is false.d)The assertion is false, but the reason is true.Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Assertion: In monosporic development, all four megaspores produced from the megaspore mother cell (MMC) do not contribute to the formation of the female gametophyte.Reason: Monosporic development results in the formation of four functional megaspores.a)Both the assertion and reason are true, and the reason is a correct explanation of the assertion.b)Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.c)The assertion is true, but the reason is false.d)The assertion is false, but the reason is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion: In monosporic development, all four megaspores produced from the megaspore mother cell (MMC) do not contribute to the formation of the female gametophyte.Reason: Monosporic development results in the formation of four functional megaspores.a)Both the assertion and reason are true, and the reason is a correct explanation of the assertion.b)Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.c)The assertion is true, but the reason is false.d)The assertion is false, but the reason is true.Correct answer is option 'C'. Can you explain this answer?.
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