Law of limiting factor was given in

Options

A. 1950
B. 1905
C. 1920
D. 1915

Answer

### Step-by-Step Solution:

1. **Identify the Law of Limiting Factor**: The Law of Limiting Factor is a principle that explains how the rate of a process (like photosynthesis) is determined by the factor that is in the least supply.

2. **Historical Context**: This law was proposed by the scientist Frederick Blackman, who conducted research related to plant processes.

3. **Year of Proposal**: The question asks for the year the law was proposed. According to historical records, Frederick Blackman proposed the Law of Limiting Factor in the year **1905**.

4. **Explanation of the Law**: The law states that if a process is influenced by multiple factors, the rate of that process will be limited by the factor that is present in the lowest amount. For example, in photosynthesis, if carbon dioxide is available in minimal quantities compared to light and water, it will limit the rate of photosynthesis.

5. **Conclusion**: Therefore, the correct answer to the question "Law of limiting factor was given in" is **1905**.