In $Ginkgo$,the male gametes are ...... .

Pinus seed shows:

In a gymnosperm,if the haploid chromosome number is $12$,what will be the number of chromosomes in its root and endosperm,respectively?

Coralloid roots are a characteristic feature of:

The number of ovules present on the megasporophyll of $Cycas$ is:

In which plant group are the sporophylls arranged on a central axis to form distinct compact structures called strobili or cones?