Animals where the fertilisation of eggs and the development of the baby up to the fetal stage takes place inside the mother's body are known as _____.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. viviparous.
- Animals where the fertilisation of eggs and the development of the baby up to the fetal stage take place inside the mother's body are known as viviparous animals.
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This condition is known as matrotrophy, in which the embryo receives nutrients directly from the mother instead of relying on the yolk for nourishment.
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Examples of viviparous animals include humans, dogs, cats, elephants, and many other mammals that give birth to live young ones rather than laying eggs.
Other Options:
- Oviparous animals are those that lay eggs, with the embryo developing outside the mother’s body after fertilization.
- In these animals, fertilization occurs internally, but embryo development takes place externally within the egg.
- The eggs of birds such as hens and ducks contain an immature embryo and are protected by a hard shell that prevents physical damage.
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Vertebrates are animals that possess a backbone or vertebral column, such as fish, birds, mammals, amphibians, and reptiles.
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Invertebrates are animals that lack a backbone, comprising the vast majority of animal species, including insects, worms, mollusks, and jellyfish.