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Which one of the following is surrounded by a callose wall?

1. male gamete
2. egg
3. pollen grain
4. microspore mother cell

Correct answer: microspore mother cell

Solution

The microspore mother cell is enclosed by a callose wall during microsporogenesis to isolate it while meiosis produces microspores. The other options are later or different reproductive stages and are not surrounded by callose in this way.

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