Sequoia is one of the tallest trees.

The leaves of gymnosperms are not well adapted to extremes of climate.

Gymnosperms are both homosporous and heteroporous.

Salvinia, Ginkgo and Pinus all are gymnosperms.

Haploid endosperm is typical feature of Gymnosperms.

Brown algae have chlorophyll $$a$$ and $$c$$ and fucoxanthin.

Archegonia are found in Bryophyta, Pteridophyta and Gymnosperms.

Mucor has biflagellate zoospores.

Chlorella and Spirulina are used as space food.

Mannitol is stored food in Rhodophyceae.

Algin and carrageenan are products of algae.

Agar-agar is obtained from Gelidium and Gracilaria.