The lateral conduction in gymnospermic leaf is by

Given below are two statements:
Statement $I$: In gymnosperms, the male and female gametophytes remain within the sporangia.
Statement $II$: In gymnosperms, seeds are not covered.
In the light of the above statements, choose the most appropriate answer from the options given below:

If the pollen grain of $Pinus$ contains $6$ chromosomes,then how many chromosomes will its endosperm have?

Winged pollen grain is the characteristic feature of

Coralloid roots of $Cycas$ possess a symbiotic alga:

In gymnosperms,the main component of xylem tissue responsible for water conduction is .....