Which of the following scientists proposed the concept of ecological food pyramid ?

Options

A. Blackmann
B. Odum
C. Elton
D. Tansley

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which scientist proposed the concept of the ecological food pyramid. This requires knowledge of ecological concepts and the contributions of various scientists in this field.

2. **Identifying the Options**: The options provided are Blackman, Odom, Alton, and Tensley. We need to determine which of these scientists is associated with the ecological food pyramid.

3. **Defining Ecological Food Pyramid**: The ecological food pyramid is a graphical representation that illustrates the energy relationships among different trophic levels in an ecosystem. It can be represented in three main forms: pyramid of numbers, pyramid of biomass, and pyramid of energy.

4. **Recalling Relevant Scientists**: Among the scientists mentioned, we need to recall who contributed to the concept of the food pyramid. The transcript mentions Charles Elton as the scientist who proposed the concept of the ecological food pyramid.

5. **Conclusion**: Based on the information gathered, the scientist who proposed the concept of the ecological food pyramid is Charles Elton. The pyramids are also referred to as Eltonian Pyramids.

6. **Final Answer**: Therefore, the correct answer is option no. 3, Alton (which refers to Charles Elton).