Question

The full-grown pollen tube shows distinct zones. Which is not one of those?

• A. Apical zone
• B. Meristematic zone
• C. Nuclear zone
• D. Vacuolation zone

Hint:

Pollen tubes grow only at the tip, they do not have a dividing meristem.

Answer 1

The Correct Option is B

Step 1: A growing pollen tube shows three recognisable zones along its length: an apical clear zone rich in vesicles at the growing tip, a nuclear zone behind it carrying the vegetative nucleus and the generative cell/sperm cells, and a vacuolated zone toward the older, base region where callose plugs form.

Step 2: The pollen tube grows by tip growth, adding new wall material only at its apex, so it never has a meristematic zone the way root or shoot apices do.

Step 3: So the zone that does not exist in a pollen tube is the meristematic zone.