In non-primate mammals the cyclical changes that occur during reproductive phase are called __________.

menstrual cycle

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oestrus cycle

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puberty

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None of the above

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Solution

The correct option is B oestrus cycle
Oestrus cycle is the set of cyclical changes that occur in non-primate females like cow, sheep, dog, deer, tiger, rat during reproduction. These changes occur due to reproductive hormones that are released after females attain sexual maturity.

The cyclical changes induced by reproductive hormones in primate females after they attain sexual maturity is called the menstrual cycle.

Attainment of sexual maturity is called puberty.

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Q. In non-primate mammals the cyclical changes that occur during reproductive phase are called __________.
[1 mark]

Q. In non-primate mammals like cow, sheep, rat, dog etc.,cyclical changes occurring during their reproductive phase is called

Q. Assertion: In non-primate mammals, cyclical changes that occur during reproduction is called oestrus cycle whereas in primates, it is called the menstrual cycle.
Reason: The females of placental mammals exhibit cyclical changes in the activities of ovaries and accessory ducts as well as hormones during the reproductive phase.

The cyclic changes in the activities of ovaries, accessory ducts as well as hormones during the reproductive phase of placental primates and non-primates are called ___ and ___ respectively.

Q. Choose the correct statement/statements from the following statements.
I) Cyclical changes that occur during reproduction in primates is called the menstrual cycle.
II) Bamboo species flower only once in their lifetime, generally after 50-100 years, produce large numbers of fruits and die.
III) Many mammals, especially those living in natural, wild conditions exhibit oestrus cycle only during favourable seasons in their reproductive phase and are called continuous breeders.
IV) During the reproductive phase, there are concomitant changes in the body like slowing of metabolism.

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Oestrous Cycle

Standard XII Biology

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