Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is

1.  monocots

2.  dicots

3.  pteridophytes

4.  gymnosperms

The giant redwood tree (Sequoia sempervirens) is a/an

1.  angiosperm

2.  free fern

3.  pteridophyte

4.  gymnosperm