Tag: phanerogams

Gymnosperms are plants with produce seeds but lacks flower. These are non flowering plants. They produce naked seeds.

Sequoia is one of the tallest trees. It is also known as the redwood tree. Leaves of gymnosperms are well adapted to the extreme of climate. Gymnosperms are heterosporous. They have both pollen and tubules. Salvinia is a pteridophyte whereas Ginkgo and Pinus are gymnosperms.

Ginkgo is a gymnosperm, a naked seeded plant in which seed is not enclosed inside the fruit. It is a dioecious plant in which the male and female species do not grow and produce reproductive organs at the same time. First, the female trees produce their seeds and then after four months, the pollen is produced to fertilize the female plant. Generally, the female plant produces two ovules both of which develop into seeds. The fertilization of seeds occurs via motile sperms. The fertilization occurs generally before or after the seeds are shed in autumn.

Thus, the correct answer is 'Ginkgo'.

Gymnosperms are seed bearing plants. They are flowerless plants. Most of the gymnosperms are vesselless. They do not have vessels in their xylem. The only division which have vessels is Gnetophytes. Gnetophytes having vessel include Genus Gnetum, Ephedra and Welwitschia. 

Gymnosperms do not have vessels in their xylem. Water conducting tissues present in them are tracheids.

Unlike bryophytes and pteridophytes, in gymnosperm, the male and female gametophytes don't have an independent free-living existence. They remain attached to the sporophytes. After fertilization, these developed into an embryo and the ovule into seeds. Seeds are not covered. So 3 generation live inside one seed of gymnosperm- the embryo and the female gametophytic tissue and the seed coat and the nucellus which is the female sporophytic tissue.