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

The innermost wall layer of anther

A microspore mother cell forms

After demonstration of totipotency, a botanist wishes to produce identical plants from an angiosperm by tissue culture. The parts or tissues which are likely to yield haploid embryos are

Where does pollen tube developes ?

Describe the structure of pollen grain and explain the development of male gametophyte in it.