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Out of the following animals , how many ...

Out of the following animals , how many show the oestrous cycle ?
[Lizard , Lion , Goat , Rat , Human , Apes , Monkeys]

A

Four

B

Five

C

Two

D

Three

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the listed animals show the oestrous cycle, we need to understand the definitions and differences between the oestrous cycle and the menstrual cycle. ### Step-by-Step Solution: 1. **Define Oestrous Cycle**: The oestrous cycle is a reproductive cycle found in many non-primates, where females go through periods of heat (oestrus) during which they are receptive to mating. Importantly, there is no menstrual bleeding involved in this cycle. 2. **Define Menstrual Cycle**: The menstrual cycle, on the other hand, is characterized by a monthly cycle of hormonal changes that includes menstruation (bleeding) in primates, including humans. 3. **Identify the Animals**: The animals listed in the question are: - Lizard - Lion - Goat - Rat - Human - Apes - Monkeys 4. **Classify Each Animal**: - **Lizard**: Does not have an oestrous cycle; it has different reproductive strategies. - **Lion**: Shows an oestrous cycle. - **Goat**: Shows an oestrous cycle. - **Rat**: Shows an oestrous cycle. - **Human**: Has a menstrual cycle. - **Apes**: Have a menstrual cycle. - **Monkeys**: Have a menstrual cycle. 5. **Count the Animals with Oestrous Cycle**: From the classification: - Animals showing the oestrous cycle: Lion, Goat, Rat. - Total: 3 animals. 6. **Final Answer**: Therefore, the number of animals that show the oestrous cycle is **3**.
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