Ten Percent Law of energy transfer was given by Linderman in the year:

Question

Accepted Answer

The Ten Percent Law of energy transfer, which states that only about 10% of the energy at one trophic level is transferred to the next trophic level in an ecosystem, was indeed proposed by Raymond Lindeman. The correct answer, as given, is Option 2: 1942. Here is a detailed explanation supporting this:

1. **Justification for Option 2 (1942):**
   - Raymond Lindeman's seminal paper, "The Trophic-Dynamic Aspect of Ecology," was published in 1942 in the journal "Ecology." This paper laid the foundation for the Ten Percent Law by discussing the energy flow through ecosystems and the efficiency of energy transfer between trophic levels. Lindeman's work was pioneering in the field of ecology, and 1942 is recognized as the year when these concepts were formally introduced and published.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (1924):** This year is incorrect because Raymond Lindeman was born in 1915, making it highly unlikely for him to have developed and published such a significant ecological theory by 1924. Additionally, there is no record of the Ten Percent Law being proposed or published in this year.
   - **Option 3 (1956):** By 1956, the Ten Percent Law was already well-established in ecological studies, having been introduced by Lindeman in 1942. There are no significant publications or events in 1956 related to the initial proposal of this law.
   - **Option 4 (1842):** This year is incorrect as it predates Lindeman's birth and the development of modern ecological science. The concept of energy transfer in ecosystems was not explored in the scientific literature of that time.

In conclusion, Option 2 (1942) is the correct answer because it aligns with the historical publication of Lindeman's influential work on energy transfer in ecosystems.