Pine wood consists of almost entirely

In gymnosperms,the pollen drop is the:

Ptyxis in $Cycas$ is

Assertion: $Ginkgo biloba$ is a living fossil.
Reason: Organisms which have persisted and remained unchanged for the past several million years while their relatives disappeared.

Pollination of pollen grains in $Pinus$ takes place at

Cycas trunk is covered with