Meiotic cell division takes place during

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

Endothecium and tapetum in anther are derived from

In some members of which of the following pairs of families, pollen grains retain their viability for months after release ?

Which one of the following statements is correct?

Microspore tetrads forms due to meiotic division occurs in......