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  • Differentiate between (a) oestrus and menstrual cycles; (b) ovipary and vivipary. Cite an example for each type.

Differentiate between (a) oestrus and menstrual cycles; (b) ovipary and vivipary. Cite an example for each type.

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Oestrus cycle

Menstrual Cycle

Female becomes sexually active during the ovulation phase

Ovulation and sexual activity of female are independent of each other

In case of conception doesn’t take place, the endometrium is absorbed

In case of conception doesn’t take place, the endometrium is shed in fragments

Visible signs appear on female genitalia

Blood and tissue discharge happens from female genitalia

Ex – Cat, Dog, Horse

Ex – Humans, Chimpanzee, Monkey

 

Ovipary

Vivipary

The animal lays eggs

The animal gives birth to progeny

There is a lesser demand for resources from the female’s body

There is a greater demand for resources from the female’s body

Chances of survival of progeny are lower

Highly likely for the progeny to survive

Ex – reptiles and aves

Ex – Most mammals, shark etc

 

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