Seasonal breeders are those animals which have
a) Oestrous cycle in their reproductive life
b) Menstrual cycle in their reproductive life
c) Reproductive cycles , occur during favorable season only
d) Reproductive cycles occur throughout the year

Options

A. Oestrous cycle their reproductive life
B. Menstrual cycle in their reproductive life
C. Reproductive cycles , occur during favorable season only
D. Reproductive cycles occur throughout the year

Answer

To solve the question regarding seasonal breeders, we need to analyze the options provided and understand the concept of seasonal breeding in animals.

### Step-by-Step Solution:

1. **Understanding Seasonal Breeders**:
- Seasonal breeders are animals that reproduce during specific times of the year, typically when environmental conditions are favorable for the survival of their offspring. This can include factors like temperature, food availability, and habitat conditions.

2. **Examining the Options**:
- **Option a**: Oestrous cycle in their reproductive life.
- The oestrous cycle refers to the reproductive cycle of female mammals, which includes phases of heat (estrus) when they are receptive to mating. Seasonal breeders often have a defined oestrous cycle that aligns with their breeding season.
- **Option b**: Menstrual cycle in their reproductive life.
- The menstrual cycle is characteristic of primates, including humans, and involves a monthly cycle of ovulation and menstruation. This is not typical for seasonal breeders.
- **Option c**: Reproductive cycles occur during favorable seasons only.
- This option accurately describes seasonal breeders, as they breed during specific seasons when conditions are optimal.
- **Option d**: Reproductive cycles occur throughout the year.
- This option contradicts the definition of seasonal breeders, as they do not reproduce year-round.

3. **Identifying the Correct Answer**:
- Based on the analysis, the best answer is **Option c**: Reproductive cycles occur during favorable seasons only. This accurately reflects the nature of seasonal breeders.

### Final Answer:
c) Reproductive cycles occur during favorable seasons only.