Haploid or diploid plants can be produced through anther culture. Diploid plants are produced from which of the following?

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

What is a pollen grain?

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:

The type of fossil pollen grains present in the area may be helpful in the exploration of

Pollinia are sac-like structures: