In a microsporangium,which layer is generally having more than one nucleus?

In angiosperms,what does the archesporium give rise to?

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:

Identify the figure shown.

In angiosperms,two non-motile male gametes are produced by the division of the:

What are the gametes of angiosperms like?