The male cone of $Pinus$ is formed of

Select one of the following pairs of important features distinguishing $Gnetum$ from $Cycas$ and $Pinus$ and showing affinities with angiosperms.

Which of the following is a living fossil?

In $Cycas$,pollination is by

Coralloid roots of $Cycas$ possess a symbiotic alga:

Coralloid roots have a symbiotic association with