Question:
In gymnosperms, the pollen chamber represents
In gymnosperms, the pollen chamber represents
Updated On: Jun 27, 2024
- a cavity in the ovule in which pollen grains are stored after pollination
- an opening in the megagametophyte through which the pollen tube approaches the egg
- the microsporangium in which pollen grains develop
- a cell in the pollen grain in which the sperms are formed.
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The Correct Option is A
Solution and Explanation
In gymnosperms,the pollen chamber is cavity in the ovule in which pollen grains are stored after pollination. Within the pollen chamber, the generative cell nucleus divides to form two gametic nuclei and the tube cell elongates to form the pollen tube. The pollen tube penetrates the female gametophyte and the gametic nuclei (also known as sperm nuclei) pass through the tube. One of them unites with an oosphere (the female gamete) and forms the zygote (2n). Hence, option B is correct.
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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