VerifiedSolution:
Hint:
The sequence of development of male gametes (sperm) in angiosperm flowers begins with a specialized tissue and progresses through multiple stages of cell division and differentiation.
Complete Answer:
Sporogenous Tissue: This is the initial stage in the development of male gametes. Sporogenous tissue is a specialized region within the anther of the flower, and it contains microspore mother cells.
Pollen Mother Cell: Microspore mother cells, found in the sporogenous tissue, undergo meiosis to give rise to microspores.
Microspore Tetrad: Following meiosis, the microspore mother cell produces a cluster of microspores called a microspore tetrad.
Pollen Grain: Each microspore from the tetrad develops into a mature pollen grain, which contains the male gametophyte. This male gametophyte includes two sperm cells, which are the male gametes.
Male Gametes: The mature pollen grain, when transported to the stigma of a compatible flower, germinates and releases its male gametes (sperm cells). These sperm cells participate in the fertilization process by uniting with the female gametes in the ovule.
Note:
The development of male gametes in angiosperms is a crucial step in the process of sexual reproduction. Male gametes are produced within pollen grains, and they must be transported to the female reproductive organs of another flower for fertilization to occur. This movement is often facilitated by pollinators such as insects or the wind. Once the pollen grain lands on the stigma, it germinates, and the male gametes are released to fuse with the female gametes, ultimately leading to the formation of seeds and the next generation of plants. This complex reproductive process is essential for the survival and diversity of flowering plants.
