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Questions and Answers
What is the primary location of zygote formation in organisms that undergo internal fertilization?
What is the primary location of zygote formation in organisms that undergo internal fertilization?
What type of life cycle involves the zygote dividing by meiosis to produce haploid spores?
What type of life cycle involves the zygote dividing by meiosis to produce haploid spores?
Why is the zygote considered a crucial link in the continuity of species?
Why is the zygote considered a crucial link in the continuity of species?
Which of the following statements is true regarding the development of the zygote in fungi and algae?
Which of the following statements is true regarding the development of the zygote in fungi and algae?
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What is the ploidy level of a zygote formed by sexually reproducing organisms?
What is the ploidy level of a zygote formed by sexually reproducing organisms?
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Study Notes
Zygote Formation
- The diploid zygote is universal in all sexually reproducing organisms
- In organisms with external fertilization, the zygote forms in the external medium (usually water)
- In organisms with internal fertilization, the zygote forms inside the organism's body
Zygote Development
- Further development depends on the life cycle and environment
- In fungi and algae, the zygote develops a thick, resistant wall to withstand desiccation and damage
- It may enter a period of rest before germination
- In organisms with a haplontic life cycle (as in Class XI), the zygote divides by meiosis to form haploid spores that grow into haploid individuals
- In organisms with diplontic or haplo-diplontic life cycles, the zygote undergoes different developmental processes (consult Class XI textbook)
Zygote Significance
- The zygote is a vital link, ensuring species continuity between generations
- All sexually reproducing organisms, including humans, begin as a single cell—the zygote
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Description
This quiz explores the crucial processes of zygote formation and development in sexually reproducing organisms. Learn about the differences in zygote development across various life cycles and understand the significance of the zygote in species continuity. Ideal for Class XI biology students focusing on reproduction.
