Tag: pictorial feature of plant kingdom

The secondary xylem in gymnosperms does not contain vessels. So it is called soft wood or non-porous wood.

The secondary xylem or wood of gymnosperms, vessels are absent. So it is called non porous wood.

So, the correct option is ‘lacks vessels’.

Gymnosperms like Cycas and Ginkgo retain ciliated, motile male gametes. While most advanced spermatophytes have lost this trait, it persists in these primitive gymnosperm groups.

Both pteridophytes and gymnosperms produce archegonia as the female sex organ. They differ in that gymnosperms produce seeds and have ovules, while pteridophytes generally do not.

Cedrus is a gymnosperm. In gymnosperms, male and female gametophytes do not have free independent existence. They remain within the sporangia retained on the sporophytes. 

The gymnosperms are the plants in which the ovules are not enclosed by an ovary wall and remain exposed, both before and after fertilization. This is that developers fertilization are not covered that is they are naked.

Gymnosperm generally lacks xylem vessels and companion cells in phloem as it grows in a cold and dry climate and they didn't evolve to have vessels and vessels are considered as advanced elements of xylem. And companion cells in phloem assist active transport of minerals which is absent in Gymnosperm.

Gymnosperms have no ovary, they can never produce fruit.