Biology,

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Biology

Reproduction in animals

1-Animals such as hen, frog, lizard and butterfly which lay eggs are called oviparous
animals.

2-Animals such as human beings, cows and dogs which give birth to young ones are
called viviparous animals.

3-Viviparous animals have external ears and epidermal hairs on their skin.

4-There are two modes by which animals reproduce. These are Sexual reproduction
and  asexual reproduction.

5-The type of reproduction where fusion of gametes does not take place is called
asexual reproduction

6-Budding, fission etc are some common methods of asexual reproduction. Budding
is observed in Hydra and binary fission is observed in Amoeba.

7-Asexual reproduction is common in micro-organisms.

8-Reproduction resulting from the fusion of male and female gametes is called sexual
reproduction.

9- The reproductive organs of a male consists of testes, sperm ducts and penis.

10- The reproductive organs of a female consists of ovaries, oviducts and uterus.

11- The ovary produces female reproductive cells called ova and the testes produces
the male reproductive cells called sperms.

12- The fusion of ovum and sperm is called fertilization. The fertilized egg is called a
zygote.

13-Fertilization that takes place outside the female body is called external fertilization
and that which takes place inside the female body is called internal fertilization.

14- Internal fertilization is observed in human beings and other animals such as hens,
cows, dogs etc.

15- External fertilization is very common in aquatic animals such as fish, starfish etc.
it is also seen in frogs.

16-The stage of the embryo in which all the body parts are identifiable is called foetus.

17-The transformation of the larva into adult through drastic changes is called
metamorphosis.

18-Due to fertilization offsprings get some characters from their parents

19-The zygote divides repeatedly to develop into an embryo.

20-The embryo gets embedded in the wall of the uterus for further development.

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