Direction: Read the following and answer the questions from given below
The ovule or the megasporangium develops as a small protuberance of the placental tissue. In the very young ovule, a single hypodermal cell is differentiated as the archesporium. This archesporium cell may or may not cut off some parietal cells and then becomes the Megaspore Mother Cell (MMC). The MMC undergoes division to form megaspore cells. Meanwhile two integuments develop from the base of the ovule.
(i) Which of these cells is the largest cell of the ovule?
(a) Antipodal cell
(b) Central cell
(c) Megaspore mother cell
(d) The size of the cells varies from species to species and none of the given above can be treated as largest
(ii) In angiosperms, microsporogenesis
(a) involve meiosis
(b) occur in ovule
(c) occur in anther
(d) form gametes without further divisions
(iii) Megasporogenesis is the
(a) formation of fruits
(b) furmation of seeds
(c) formation of megaspores
(d) Both (b) and (c)
(iv) Megaspore mother cell is found near the region of
(a) micropyle
(b) chalaza
(c) nucellus
(d) integuments
(v) Assertion (A) Megaspore mother cell undergoes meiosis to produce four megaspores.
Reason (R) Megaspore mother cell and megaspore both are haploid.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) Both A and R are false

Question

Filo · Accepted Answer

(i) (c) Ovules generally differentiate a single Megaspore Mother Cell (MMC) in the micropylar region of the nucellus. It is a largest cell containing dense cytoplasm and prominent nucleus.
(ii) (c) In angiosperms, microsporogenesis, i.e. formation of microspores (or pollen grains) occurs by the meiotic divisions of diploid microspore mother cell (or pollen mother
cells). Microsporogenesis takes place in the anther.
(iii) (c) Megasporogenesis, i.e. formation of megaspores occurs by the meiotic divisions of diploid megaspore mother cells.
Megasporogenesis takes place in the ovule.
(v) (c) A is true, but R is false. R can be corrected as
Megaspore mother cell is diploid and megaspore is haploid.

Question Text	Direction: Read the following and answer the questions from given below The ovule or the megasporangium develops as a small protuberance of the placental tissue. In the very young ovule, a single hypodermal cell is differentiated as the archesporium. This archesporium cell may or may not cut off some parietal cells and then becomes the Megaspore Mother Cell (MMC). The MMC undergoes division to form megaspore cells. Meanwhile two integuments develop from the base of the ovule. (i) Which of these cells is the largest cell of the ovule? (a) Antipodal cell (b) Central cell (c) Megaspore mother cell (d) The size of the cells varies from species to species and none of the given above can be treated as largest (ii) In angiosperms, microsporogenesis (a) involve meiosis (b) occur in ovule (c) occur in anther (d) form gametes without further divisions (iii) Megasporogenesis is the (a) formation of fruits (b) furmation of seeds (c) formation of megaspores (d) Both (b) and (c) (iv) Megaspore mother cell is found near the region of (a) micropyle (b) chalaza (c) nucellus (d) integuments (v) Assertion (A) Megaspore mother cell undergoes meiosis to produce four megaspores. Reason (R) Megaspore mother cell and megaspore both are haploid. (a) Both A and R are true and R is the correct explanation of $A$ (b) Both $A$ and $R$ are true, but $R$ is not the correct explanation of $A$ (c) $A$ is true, but $R$ is false (d) Both A and R are false
Topic	Sexual Reproduction in Flowering Plants
Subject	Biology
Class	Class 12
Answer Type	Text solution:1
Upvotes	61

Text solutionVerified

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Text solutionVerified

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