7. How do Organisms Reproduce?
The chapter explores the mechanisms and significance of reproduction in organisms, highlighting that reproduction, while not essential for individual survival, is vital for the continuation of species. It distinguishes between asexual and sexual reproduction, elaborates on various mechanisms such as fission, budding, vegetative propagation, and the role of DNA in inheritance and variation. The chapter concludes with an overview of human reproductive processes and related health considerations.
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What we have learnt
- Reproduction is not essential for the life of an individual organism but is crucial for the species.
- Different organisms employ various reproductive modes like fission, budding, and sexual reproduction based on their body designs.
- Sexual reproduction promotes greater genetic variation beneficial for species survival, while asexual reproduction involves creating new generations from a single individual.
Key Concepts
- -- Asexual Reproduction
- A mode of reproduction involving a single organism producing new individuals without the fusion of gametes.
- -- Sexual Reproduction
- A mode of reproduction involving the combination of genetic material from two individuals, leading to genetically diverse offspring.
- -- Meiosis
- A type of cell division that reduces the chromosome number by half, creating gametes for sexual reproduction.
- -- Pollination
- The transfer of pollen from the anther of a flower to the stigma of the same or another flower, necessary for fertilization in flowering plants.
- -- Regeneration
- The process by which certain organisms can grow back lost body parts or develop from fragments.
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