Question

Match List I with List II 

 

• A. A-IV, B-III, C-II, D-I
• B. A-I, B-III, C-II, D-IV
• C. A-III, B-IV, C-II, D-I
• D. A-IV, B-III, C-I, D-II

Hint:

Remember the classic estrous cycle durations:
- Small rodents (Rat/Mouse) $\rightarrow$ 4 to 5 days.
- Ewe $\rightarrow$ 17 days.
- Cow/Sow/Mare $\rightarrow$ ~21 days (with Mare being slightly longer, up to 24 days).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The estrous cycle is the recurring physiological change in the reproductive system of female mammals, regulated by gonadotropic and ovarian hormones.
The duration of the estrous cycle varies widely across different species.

Step 2: Detailed Explanation:
Let us match each animal with the typical duration of its estrous cycle:
- A. Ewe (Sheep): Ewes have a seasonally polyestrous cycle with a relatively short duration of 16 to 17 days.
Thus, A matches with IV.
- B. Cow: Cows are non-seasonally polyestrous with a typical cycle length of 20 to 21 days.
Thus, B matches with III.
- C. Mare (Horse): Mares are seasonally polyestrous with a slightly more variable cycle length averaging 20 to 24 days.
Thus, C matches with II.
- D. Rats: Rodents like rats have an extremely rapid, non-seasonal estrous cycle of 4 days (ranging from 4 to 5 days).
Thus, D matches with I.

Step 3: Final Answer:
Matching these pairs gives: A-IV, B-III, C-II, D-I, which corresponds to option (A).