The diploxylic condition in $Cycas$ occurs in:

Conifers are adapted to tolerate extreme environmental conditions because of

Which plant has a sporophytic phase differentiated into root,stem,and leaves?

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:

What nature does the acicular (needle-like) shape of $Pinus$ leaves depict?

The tallest living tree in the world is ........