Question

E.Short answer type questions:
1)What is external fertilization. Name one organism that exhibits external fertilization.
2)What is meant by reproduction?
3)Define metamorphosis.
4) Differentiate between viviparous animals and oviparous animals.
5)How are test-tube babies developed?

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Answer 1

Answer:

1. Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.

2. Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parents". ... There are two forms of reproduction: asexual and sexual. In asexual reproduction, an organism can reproduce without the involvement of another organism.

Answer 2

1) Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.

Salmon, cod, trout, and char are all examples of the fish that externally fertilize. The female and male both release their gametes into the water, where they diffuse together and fertilize.

2) Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parents". ... There are two forms of reproduction: asexual and sexual. In asexual reproduction, an organism can reproduce without the involvement of another organism.

3) Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Some insects, fish, amphibians, mollusks, crustaceans, cnidarians, echinoderms, and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior. Animals can be divided into species that undergo complete metamorphosis.

4) The main difference between oviparous and viviparous animals is that oviparous animals do not undergo any embryonic development inside the mother whereas viviparous animals develop into a young animal inside the mother. This means oviparous animals lay eggs. ... Therefore, they do not lay eggs.

5) It involves fertilizing an egg outside the body, in a laboratory dish, and then implanting it in a woman's uterus.