Question

Consider the pyramid of energy of an ecosystem given below:

If \(T_4\) is equivalent to 1000 J, what is the value at \(T_1\)

• A. \(\frac{10000}{10}J\)
• B. \(\frac{10000}{10}\times 4\ J\)
• C. 10,000 J
• D. 10,00,000 J

Answer 1

The Correct Option is D

The pyramid of energy illustrates the energy flow across different trophic levels of an ecosystem. The energy decreases as it moves up each successive trophic level due to energy loss primarily as heat. Here's a detailed breakdown of how to find the energy at the first trophic level (\(T_1\)) given \(T_4\) is 1000 J.

1. Understanding the Pyramid of Energy: Each level represents the energy available, with the largest energy at the bottom (\(T_1\)) and the smallest at the top (\(T_4\)).
2. Energy Transfer Efficiency: Usually, only 10% of the energy from one trophic level is transferred to the next. This is known as the 10% law.
3. Given \(T_4 = 1000 \, J\): This is the energy available to the fourth trophic level.
4. Calculate \(T_3\): Using the 10% law, the energy at \(T_3\) would be \(\frac{1000 \, J}{0.1} = 10,000 \, J\).
5. Calculate \(T_2\): Similarly, energy at \(T_2\) would be \(\frac{10,000 \, J}{0.1} = 100,000 \, J\).
6. Calculate \(T_1\): Finally, the energy at \(T_1\) would be \(\frac{100,000 \, J}{0.1} = 1,000,000 \, J\).

Thus, the energy at the first trophic level \(T_1\) is 10,00,000 J.

Therefore, the correct answer is: 10,00,000 J.