In angiosperms,all $4$ microspores of a tetrad are covered by a layer which is formed by:

Describe the external structure of a pollen grain.

What is the ploidy of the cells of a microspore tetrad (in $n$)?

During meiosis in a pollen mother cell, the daughter cells are interconnected by cytoplasmic passages. The whole structure is called:

When mature anthers of $Datura$ $innoxia$ are cultured in a culture medium supplemented with phytohormones named kinetin,coconut milk,and plum juice,several embryos can be obtained floating inside the microsporangia. These embryos can develop into plants that are:

If there are $1280$ microspores in a tetralocular anther,how many microspore mother cells will be there in its each pollen chamber?