Ubisch bodies are secreted by
Tapetum
Exine
Microspore mother cells
Endothecium
Pollen kit material is secreted by
The anther wall consists of four wall layers where
At the time of pollination, how many cells are formed in the pollen grains
The pollen viability period of rice and pea respectively, is
In some members of which of the following pairs of families, pollen grains retain their viability for months after release ?