Bisexual flowers which never open are known as:

Which of the following statements is true?

How many meiotic divisions are required to produce $200$ pollen grains?

Select the incorrect statement.

In an embryo sac,the $n, 2n, 3n$ conditions are respectively found in:

The male and female reproductive organs of several pteridophytes and gymnosperms are comparable to floral structures of angiosperms. Make an attempt to compare the various reproductive parts of pteridophytes and gymnosperms with reproductive structures of angiosperms.