Single birth is the rule in humans while other mammals give multiple births. Explain. [4 MARKS]

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Solution

Each Point: 1 Mark

There are some important differences in human as compared to other mammals.
(i) The uterus in human is a single structure as compared to two in other mammals.
(ii) Only one egg is shed at ovulation so that only one embryo develops at a time, multiple births occur but rarely.
(iii) Developments period is quite long about 40 weeks.
(iv) There is no heat period.

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Explain in detail: Internal fertilization takes place in both humans and hens but human beings give birth to babies while hens lay eggs.

State whether the following statements are true or false :

(a) Each sperm is a single cell.

(b) A new human individual develops from a cell called gamete.

(d) A zygote is formed as a result of fertilisation.

(e) External fertilisation takes place in frog.

(f) An embryo is made up of a single cell.

(g) Oviparous animals give birth to young ones.

(h) Oviparous animals give birth to young ones.

(i) The hens give birth to chicks like human beings give birth to babies.

(j) Amoeba reproduces by budding.

(k) Binary fission is a method of asexual reproduction.

(l) Fertilisation is necessary even in asexual reproduction.

(m) Cloning is a sexual reproduction method in mammals.

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