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External Fertilization Video Lecture - Class 8
FAQs on External Fertilization Video Lecture - Class 8
| 1. What is external fertilization? |  |
Ans. External fertilization is a reproductive process in which the fusion of the egg and sperm occurs outside the body of the organism. This process is common in aquatic organisms, such as fish and amphibians, where the male releases sperm into the water and the female releases eggs. The sperm then fertilizes the eggs externally, leading to the development of offspring.
| 2. Which organisms undergo external fertilization? | |
Ans. External fertilization is predominantly observed in aquatic organisms. Fish, amphibians, some reptiles, and many invertebrates, such as sea urchins and corals, undergo external fertilization. These organisms release their gametes (eggs and sperm) into the water, where fertilization takes place.
| 3. What are the advantages of external fertilization? | |
Ans. External fertilization offers several advantages to organisms. Firstly, it allows for the production of a large number of offspring, as the gametes are released into a larger environment with more chances of successful fertilization. Secondly, it promotes genetic diversity by increasing the chances of different individuals coming together for reproduction. Additionally, it reduces the energy expenditure required for internal fertilization processes.
| 4. What are the challenges faced during external fertilization? | |
Ans. External fertilization comes with its set of challenges. One major challenge is the vulnerability of gametes to predation or environmental factors, such as temperature and pH fluctuations. Another challenge is the need for synchronization between males and females to release their gametes simultaneously. Lastly, competition among males to fertilize the eggs can be intense, leading to reduced chances of successful fertilization.
| 5. How does external fertilization impact the survival of offspring? | |
Ans. External fertilization does not provide any parental care or protection to the offspring. As a result, the survival rate of the offspring is generally lower compared to organisms that undergo internal fertilization. The exposed eggs and embryos are susceptible to predation, disease, and harsh environmental conditions. However, the production of a large number of offspring through external fertilization increases the chances of some individuals surviving and continuing the species.
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Oct 24, 2024 Last updated |
External Fertilization for Class 82024 is part of Class 8 preparation. The notes and questions for External Fertilization
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