Who among the following scientist gave theory of germplasm and discard the theory of use and disuse of organ?

Options

A. A.Weismann
B. Alfred Wallace
C. Hugo-de-Vries
D. Thomas Malthus

Answer

To solve the question regarding which scientist proposed the theory of germplasm and rejected the theory of use and disuse of organs, we can follow these steps:

### Step 1: Understand the Theories
- The theory of germplasm refers to the idea that only the genetic material (germ cells) is inherited from one generation to the next, while acquired characteristics (changes due to use or disuse of organs) are not inherited.
- The theory of use and disuse, proposed by Lamarck, suggests that organisms can pass on traits acquired during their lifetime to their offspring.

**Hint:** Familiarize yourself with the basic concepts of inheritance and the key figures in evolutionary biology.

### Step 2: Identify Key Scientists
- August Weismann is known for his work on the continuity of germplasm. He conducted experiments that demonstrated that traits acquired during an organism's life (like cutting off a rat's tail) do not affect the genetic material passed to the next generation.
- Other scientists mentioned, such as Alfred Wallace, Thomas Malthus, and Hugo de Vries, contributed to evolutionary theory but did not specifically address the germplasm theory.

**Hint:** Focus on the contributions of each scientist to understand their relevance to the question.

### Step 3: Analyze Weismann's Experiments
- Weismann's experiments involved cutting the tails of rats for multiple generations and observing that the offspring still had tails. This provided evidence against Lamarck's theory.
- He concluded that only the germ cells (sperm and egg) carry hereditary information, thus supporting the theory of germplasm.

**Hint:** Remember specific experiments that support or refute theories, as they can be crucial in understanding the scientist's contributions.

### Step 4: Conclusion
- Based on the information gathered, it is clear that August Weismann is the scientist who proposed the theory of germplasm and rejected the theory of use and disuse of organs.

**Hint:** Summarize the findings to reinforce your understanding of the correct answer.

### Final Answer:
The scientist who gave the theory of germplasm and discarded the theory of use and disuse of organs is **August Weismann**.