Question

During the development of male gametes in angiosperms, the microspore mother cell undergoes .............. meiosis and .............. mitosis respectively.

• A. two and two
• B. two and one
• C. one and two
• D. one and three

Hint:

In gametogenesis, meiosis reduces the chromosome number, while mitosis helps in cell division to form the mature gamete.

Answer 1

The Correct Option is B

Step 1: Understanding gamete development in angiosperms.
In angiosperms, the microspore mother cell undergoes meiosis to form four haploid microspores, and then each microspore undergoes one round of mitosis to form the pollen grain, which is the male gamete.
Step 2: Analyzing the options.
(A) two and two: Incorrect, two rounds of meiosis occur, but only one round of mitosis happens.
(B) two and one: Correct, meiosis happens in two stages, and one round of mitosis occurs for the microspore.
(C) one and two: Incorrect, meiosis is two stages, and only one mitotic division occurs.
(D) one and three: Incorrect, there is no third division in the process of gametogenesis.
Step 3: Conclusion.
The correct answer is (B) two and one, as meiosis occurs in two stages, followed by one mitotic division.