Which of the following is not a concept of Lamarck?

Options

A. Environmental pressure causes variation
B. Rate and survival of organism in different due to variation
C. Inheritance of acquired characters
D. If an organ is used constantly it will continuously increase its size

Explanation

**Step-by-Step Solution:**

1. **Understanding Lamarck's Theory**: Begin by recognizing that Lamarck proposed a theory of evolution that included the concepts of the use and disuse of organs and the inheritance of acquired characteristics.

2. **Identify Key Concepts of Lamarck**:
- **Use and Disuse of Organs**: This concept suggests that organs that are used frequently become stronger and larger, while those that are not used deteriorate.
- **Inheritance of Acquired Characteristics**: This means that traits acquired during an organism's lifetime can be passed on to its offspring.
- **Internal Vital Force**: Lamarck believed in an internal force that drives organisms to adapt to their environment.
- **Doctrine of Desire**: This concept implies that organisms have an inherent desire to evolve and adapt to their surroundings.

3. **Analyzing the Options**: The question asks for the concept that is NOT part of Lamarck's theory. The salient features of Lamarck's theory include:
- Inheritance of acquired characteristics
- Use and disuse of organs
- Internal vital force
- Doctrine of desire

4. **Identifying the Incorrect Concept**: The option that states "rate and survival of the organism is different due to variation" is not a concept of Lamarck. Lamarck did not address the concept of variation in the way that later evolutionary theories, such as Darwin's, did.

5. **Conclusion**: Therefore, the answer to the question is that the concept of "rate and survival of the organism is different due to variation" is NOT a part of Lamarck's theory.

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