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Posted by Divya Singh Divya 5 hours ago
There is alternation of generations between haploid gametophyte (male gametophyte and female gametophyte) and diploid sporophyte (main plant body) in the life cycle of a plant.
The anthers, which contain microsporangia, produce microspores by meiosis, and the microspores develop into male gametophytes called pollen.
The ovaries, which posses megasporangia simultaneously produce megaspores which grow into female gametophytes, called ovules. It is a seven celled structure with one large central cell containing two polar nuclei and one egg cell.
By the process of pollination, the pollen is transferred to the stigma of the pistil. The pollen grain germinates and a pollen tube grows down into the ovary. Eventually, two sperm nuclei travel down the pollen tube. One sperm nuclei fertilizes the egg forming zygote (which grows into an embryo) and the other two polar nuclei forming triploid cell (endosperm) which often serves as food for the embryo. This is called double fertilization. The Zygote which begins the next sporophyte generation, on complete development forms a seed. When the seed germinates, the sporophyte matures and the life cycle begins again.
Posted by Amisha Meena 1 day, 1 hour ago
Posted by Kiran Rana 1 day, 6 hours ago
1. Vascular bundles are arranged in a ring.
1. Vascular bundles are scattered.
2. Secondary growth takes place.
2. Secondary growth does not happen.
3. Wood is formed.
3. Wood is not formed.
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Posted by Omkar Singh Omkar Singh 5 days ago
|Meaning||Mitosis is the process of cell division which occurs in all types of cells (excluding *** cells), with the purpose of the asexual reproduction or the vegetative growth.||Meiosis is the process occurs in the specialized type of cell called as meiocytes, which supports the sexual reproduction by the gametogenesis.|
|Discovered by||Walther Flemming.||Oscar Hertwig.|
|Steps required to complete the cycle||Prophase, Metaphase, Anaphase, Telophase.||Prophase I, Metaphase I, Anaphase I, Telophase I; (Meiosis II), Prophase II, Metaphase II, Anaphase II and Telophase II.|
|Occurs in||Somatic cells.||Germ cells.|
Posted by Biswas Lenka 5 days ago
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Posted by Nisvanth .S 5 days, 4 hours ago
Double fertilization means the fusion of one male gamete with egg cell and other male gamete with the polar nuclei, this is known as triple fusion.
Posted by Vinod Kumar 5 days, 5 hours ago
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