Which of the following is a living fossil?

Plants in which seeds are produced on megasporophylls and are not enclosed by fruits are included in which group?

$S :$ $Sequoia$ $sempervirens$ is an example of an angiosperm.
$R :$ $Eucalyptus$ is the tallest tree in the world.

Gymnosperms lack true fruits because .......

In which plant group are the sporophylls arranged spirally along an axis to form distinct compact structures called strobili or cones?

The genus $Sequoia$ belongs to which of the following orders?