The tapetal nuclei in anthers of many angiosperm flowers are

In angiosperms,the four microspores of a tetrad are covered by a layer which is made up of:

In the male reproductive whorl of a flower,the archesporial cells are formed by . . . . . . .

At which stage of pollen grain development are the male gametes formed?

If the generative cell is destroyed by a laser,the pollen tube still forms. This is because:

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: