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Define external fertilization. Mention i...

Define external fertilization. Mention its disadvantages.

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When the fusion of gametes occurs outside the body of the organism in the external medium it is called external fertilization,
Disadvantages: Many of the gametes fail to fuse, hence the organisms exhibiting external fertilization have to produce a large number of gametes (wastage of gametes).
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SUBHASH PUBLICATION-REPRODUCTION -TWO MARK QUESTIONS AND ANSWERS
  1. Which is a better mode of reproduction:- sexual or asexual? Why?

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  2. Offsprings formed due to sexual reproduction have better chances of su...

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  3. How does the progeny formed from asexual reproduction differ from thos...

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  4. Distinguish between asexual and sexual reproduction. Why is vegetative...

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  5. What is vegetative propagation? Give two suitable examples.

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  6. Higher organisms have resorted to sexual reproduction inspite of its c...

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  7. Explain why meiosis and gametogenesis are always interlinked?

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  8. Define external fertilization. Mention its disadvantages.

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  9. Differentiate between gametogenesis from embryogenesis.

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  10. Briefly describe the post fertillization changes in a flower.

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  11. Different between a stamina and a pistillate flower, Give the term for...

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  12. Explain parthenogenesis with examples.

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  13. What is fission? Name the types of fission.

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  14. Differentiate between the following:

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  15. Differentiate between a zoospore and zygote.

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  16. Define 'oestrus' and 'menstrual cycles.

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  17. Mention the different stages of sexual reproduction.

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  18. Differentiate between oviparous and viviparous animals with a suitable...

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  19. What is asexual reproduction? Mention the type of asexual reproduction...

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  20. Differentiate between seasonal breeders and continuous breeders.

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