A typical angiosperm anther is bilobed and tetragonal consisting of:

Select the odd one out w.r.t. wall layers of microsporangium in flowering plants

Which of the following option about tapetum is correct?

The prominent pollen grain apertures called germ pores are present on

Which of the following weed has become a major cause of pollen allergy in India?

$\alpha$- cellulose fibrous thickening is present in/on

Select the odd one out w.r.t. the pollen grains