Which of the following produced large number of small size off spring ?

Options

A. Oysters
B. Pelgic fishes
C. Snail
D. Both (a) & (b)

Answer

To determine which organisms produce a large number of small-sized offspring, we can classify them into two categories: K-selected species and R-selected species.

### Step-by-Step Solution:

1. **Understand the Classification**:
- **K-selected species**: These species typically produce fewer offspring but invest more time and resources into raising them. They tend to have larger body sizes and longer lifespans. Examples include elephants and humans.
- **R-selected species**: These species produce a large number of offspring with little to no parental care. They are usually smaller in size and have a high reproductive rate. Examples include insects, fish, and some amphibians.

2. **Identify Characteristics of R-selected Species**:
- R-selected species are characterized by:
- High reproductive rates
- Small body size
- High number of offspring
- Minimal parental investment

3. **Analyze the Given Options**:
- The question asks which organisms produce a large number of small-sized offspring.
- The options provided include:
- A) Oysters
- B) Pelagic fishes
- C) Snails

4. **Evaluate Each Option**:
- **Oysters**: Known to produce a large number of eggs, making them R-selected.
- **Pelagic fishes**: Also produce many small eggs and are considered R-selected.
- **Snails**: Generally larger in size and produce fewer offspring, categorizing them as K-selected.

5. **Conclusion**:
- The correct answers are A (Oysters) and B (Pelagic fishes) as they both produce a large number of small-sized offspring.

### Final Answer:
A) Oysters and B) Pelagic fishes.