Which of the following is not a principle of Lamarckism ?

Options

A. Use and disuse
B. Survival of fittest
C. Inheritance of acquired characters
D. Influence of environment

Answer

To determine which of the following is not a principle of Lamarckism, we need to understand the key principles associated with Lamarck's theory of evolution. Here’s a step-by-step breakdown:

### Step 1: Identify the Principles of Lamarckism
1. **Internal Vital Force**: Lamarck proposed that all living organisms possess an internal vital force that drives their growth and development.
2. **Influence of the Environment**: Changes in the environment create new needs for organisms, leading to the development of new structures.
3. **Use and Disuse of Organs**: Organs that are used frequently become stronger and better developed, while those that are not used may degenerate.
4. **Inheritance of Acquired Characteristics**: Traits acquired during an organism's lifetime due to use, disuse, or environmental influences can be passed on to the next generation.

### Step 2: Compare with Darwin's Theory
- **Survival of the Fittest**: This concept is a key component of Darwin's theory of natural selection, which states that individuals better adapted to their environment are more likely to survive and reproduce. This principle is not part of Lamarckism.

### Step 3: Identify the Incorrect Principle
Given the principles outlined, we can conclude that the principle that is **not** a part of Lamarckism is the **Survival of the Fittest**.

### Conclusion
Thus, the answer to the question "Which of the following is not a principle of Lamarckism?" is the principle related to **Survival of the Fittest**, which is associated with Darwin's theory.

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