Question:
Which of the following is a gymnosperm in which vessels are found?
Which of the following is a gymnosperm in which vessels are found?
Updated On: Apr 14, 2024
- Cycas
- Pinus
- Ginkgo
- Gnetum
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The Correct Option is D
Solution and Explanation
Gnetophyta is a small group of gymnospermous vascular plants represented by three living genera Ephedra , Gnetum and Welwitschia. This lineage dates back to the early cretaceous in the fossil record and is widely considered to be the closest relative of the flowering plants. A distinguishing feature of all gnetophytes is the presence of both tracheids and vessels in their xylem tissue providing evidence that Gnetophyta might have been ancestral to flowering plants. All other Gymnosperms (except gnetophytes) possess only tracheids and lacks vessels in their xylem tissue.
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Concepts Used:
Plant Kingdom
The Plant Kingdom comprises all the plants that have some shared characteristics. These are bacteria (prokaryotes), photosynthetic plants, fungi, and several non-photosynthetic plants.
Read Also: Two Kingdom Classification
Several features of Kingdom Plantae are as follows:
- They are stationary. They are static and usually remain in one place only.
- They have branches that expanded and green leaves due to the presence of chlorophyll.
- They are an autotrophic mode of nutrition that simply means they prepare their food with the help of water, sunlight and carbon dioxide. It is further known as self-nutrition.
- They indulge in photosynthesis during the day and therefore more carbon dioxide is needed during the day and at night it is released.
- They secure their food in the form of starch-like algae.
- They have an inelastic wall around their cell known as a cell wall comprised of cellulose.
- There is an absence of the nervous system and excretory system.
- Reproduction is entirely dependent on air, insects and water. Asexual and vegetative method of reproduction is noticed or detected.
- The non-photosynthetic plants acquire their food through parasitism, i.e through their host like Indian pipe.
Read More: Classification of Plants