describe the development of male gametophyte in pinus
Answers
Answer:
In the life cycle, all plants and some types of algae go through the gametophyte stage. Both the multicellular haploid Gametophyte and the multicellular diploid Sporophyte are produced during this phase.
Explanation:
1. Microspores in Pinus have wings.
2. Pinus contains two prothallial cells.
3. Pinus prothallial cells begin to break down even before pollination.
4. In Pinus, pollination occurs when the plant has four cells, including two prothallial cells, a generative cell, and a tube cell.
5. Two male gametes that are not motile and lack cilia are developed from generative cells in the Pinus.
6. The development of the male gametophyte in Pinus takes about a full year to complete.
7. A pollen tube swings downward into a pine tree's archegonial chamber.
8. The role of the sperm-carrier in the Pinus pollen tube.
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Answer:
All plants and some varieties of algae go through the gametophyte stage in their life cycle. During this stage, both the multicellular diploid Sporophyte and the multicellular haploid Gametophyte are produced.
Explanation:
1. The structure that contains microspores is called a microsporophyll. A single layer of cells surrounds the sessile microsporangium.
2. Several microspores are produced by each microsporangium. Inner intine and outer exine cover each microspore. The microspore has wings.
3. The male gametophyte's first cell is called a microspore.
4. Within the microsporangium, the microspore starts to germinate.
5. A huge cell and a very small initial Prothallial are created when the microspore nucleus divides.
6. The big separates the antheridial cell and a second Prothallial cell.
7. At this point, the microspore shed at this stage lands near the female gametophyte. Inside the female gametophyte is where the male gametophyte continues to develop.
8. The antheridial cell divides into two small generating cells and one big tube cell as the two protothallial cells degenerate ( tube nucleus).
9. In close proximity to the nucellus of the female gametophyte, the tube nucleus controls the formation of the pollen tube.
10. The micropyle of a mature ovule (megasporangium) secretes a mucilaginous material. The mucilaginous material attracts a lot of pollen grains.
11. When the mucilage dries up and approaches the nucellus's apex, some of them are dragged within.
12. The pollen tube is formed when the tube cell expands and protrudes. The growth of the microspore's intine occurs in the pollen tube. The nucellus is pierced by the pollen tube.
13. The generative cell differentiates into a fertile body cell and a sterile stalk cell following this.
14. The body cell divides to produce two male sperms of different sizes that are not motile.
The male Pinus gametophyte's development is now complete.
Describe the process of development of male gametophyte in angiosperms with suitable diagrams.
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Development of male gametophyte- Write short notes.
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