Question

Which one produces callose for breaking plasmodesmal connections among microspore mother cell?

• A. Microspore mother cells
• B. Sporogenous cells
• C. Tapetum
• D. Middle layers

Answer 1

Answer: (A)

Microspore mother cells

The process of formation of microspores from spore mother cells (SMC) or Microspore mother cell is called microsporogenesis. Very important changes occur in the Tapetum and locule of the anther during microsporogenesis. In the beginning, when the locule is preparing for microsporogenesis, there are plasmodesmatal connections between Tapetal and Tapetal cells, tapetal and SMC and between SMC and SMC. Very small molecules can pass through these connections. Towards the end of zygotene-pachytene stage of prophase I of meiosis, callose layer starts to get depositing around each SMC and the plasmodesmatal connections are cut off. This callose is contributed by the dictyosomes present in the peripheral cytoplasm of the microspore mother cell.

Hence, Microspore mother cells produces callose for breaking the plasmodesmatal connections among microspore mother cells.

So, the correct answer is A.