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Plant Life Cycles & Alternation of Generations (Old NCERT) Video Lecture - NEET
FAQs on Plant Life Cycles & Alternation of Generations (Old NCERT) Video Lecture - NEET
| 1. What is alternation of generations in plant life cycles? |  |
Ans. Alternation of generations refers to the reproductive strategy in plants where they alternate between a multicellular diploid phase called the sporophyte and a multicellular haploid phase called the gametophyte. In this cycle, the sporophyte produces spores through meiosis, which then develop into gametophytes. The gametophytes produce gametes through mitosis, which then fuse to form a zygote, giving rise to a new sporophyte generation.
| 2. How does the alternation of generations contribute to plant reproduction? | |
Ans. Alternation of generations is essential for plant reproduction as it allows for the production of both gametes and spores. The sporophyte generation produces spores through meiosis, which are dispersed and develop into gametophytes. The gametophytes then produce gametes through mitosis, which fuse during fertilization to form a zygote. This zygote develops into a new sporophyte, completing the cycle and ensuring the continuation of the plant species.
| 3. What are some examples of plants that exhibit alternation of generations? | |
Ans. Examples of plants that exhibit alternation of generations include mosses, ferns, and flowering plants. In mosses, the dominant generation is the gametophyte, while in ferns and flowering plants, the dominant generation is the sporophyte. Each of these plants goes through a distinct cycle of alternating between sporophyte and gametophyte generations.
| 4. How does the alternation of generations contribute to genetic diversity in plants? | |
Ans. The alternation of generations in plants contributes to genetic diversity through two key processes: meiosis and fertilization. During meiosis, the sporophyte generation produces haploid spores, each with a unique combination of genetic material. These spores develop into gametophytes, which produce gametes through mitosis. When gametes from different gametophytes fuse during fertilization, they combine their genetic material, resulting in offspring with new combinations of genes. This genetic diversity allows plants to adapt to changing environments and increases their chances of survival.
| 5. How does the alternation of generations differ between different plant groups? | |
Ans. The alternation of generations can differ between different plant groups in terms of the relative dominance of the sporophyte and gametophyte generations. In some plants, such as mosses, liverworts, and hornworts, the gametophyte generation is dominant and the sporophyte generation is relatively small and dependent on the gametophyte. In contrast, in ferns, gymnosperms, and flowering plants, the sporophyte generation is dominant and the gametophyte generation is relatively small and short-lived. Additionally, the structures and reproductive strategies of the sporophyte and gametophyte generations can vary among different plant groups.
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