Question:
A gymnosperm lacking archegonium is
A gymnosperm lacking archegonium is
Updated On: Mar 29, 2024
- Pinus
- Ephedra
- Cycas
- Gnetum
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The Correct Option is D
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Answer (d) Gnetum
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Explanation:
- Archegonium is a female reproductive organ found in ferns and mosses.
- It occurs in gymnosperms like cycads, ephedra, and conifers.
- Archegonium is a flask shaped structure consisting of a neck with one or more than one layer of cell and a swollen base known as venter. The venter consists of the egg.
- As the archegonium develops, the neck-canal cells that are above the egg disappear, creating a channel for the sperm to enter. The analogous male reproductive organ, the antheridium, is where the sperms are made.
- Ephedra contains 1-3 archegonia, cycas have about 2-8 archegonia whereas Pinus contains 2-4 archegonia in number. Gnetum, on the other hand have no archegonium
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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.
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- 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.
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- The non-photosynthetic plants acquire their food through parasitism, i.e through their host like Indian pipe.
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