In $40\;\%$ angiosperms, the pollen grains are shed at
Four-celled stage
Three-celled stage
Two-celled stage
Five-celled stage
Which one of the following statements is correct?
The pollen grain represents
Draw the diagram of a microsporangium and label its wall layers. Write briefly about the wall layers ?
Haploids can be obtained form
Which of the following statements is correct?