The endosperm of $Pinus$ is:

$A$ transverse section of a plant organ shows vessels but does not show companion cells. This organ may belong to:

Resin canals are abundantly found in . . . . . . .

In which one of the following do male and female gametophytes not have a free-living independent existence?

The largest group of gymnosperms is ........

In gymnosperms,the leaves are well-adapted to withstand extremes of temperature,humidity,and wind. What are the xeric characters in conifers?