Modes of Reproduction: Asexual and Sexual · NCERT Biology

Cyclical changes in the activities of ovaries and accessory ducts during the reproductive phase in non-primate mammals is called:

  1. Menstrual cycle
  2. Oestrus cycle
  3. Circadian rhythm
  4. Parturition
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Correct answer: Oestrus cycle

The oestrus cycle occurs in non-primate mammals like cows, sheep, and dogs. Unlike the menstrual cycle in primates, the endometrium is reabsorbed if fertilization does not occur.

Difficulty: Medium Question 13 of 20

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