Which of the following tissues is present in the leaves of $Pinus$ to conduct water and food?

The spermatozoid of $Cycas$ is:

Which is the tallest tree?

Resin ducts are .....

Give information about the reproductive organs of Gymnosperms.

Consider the following statements regarding gymnosperms and choose the correct option.
$I.$ In gymnosperms,the male and female gametophytes have an independent existence.
$II.$ The multicellular female gametophyte is retained within the megasporangium.
$III.$ The gymnosperms are heterosporous.
Of these statements: