Microsporangia develops in to

The microspore tetrad of angiosperm at the time of formation, are surrounded by a callose wall. Breakdown of this wall is brought about by the enzyme callase synthesized by the

How many meiotic divisions are necessary to produce $100$ pollen grains

At the time of pollination, how many cells are formed in the pollen grains

Ubisch bodies are secreted by

Which of the following statement is correct for the pollen tube