a grass starts with 30,000 kj of energy. how much energy would a cheetah acquire after it ate a zebra that…

a grass starts with 30,000 kj of energy. how much energy would a cheetah acquire after it ate a zebra that consumed the grass?\n30 kj\n300 kj\n3,000 kj\n30,000 kj

a grass starts with 30,000 kj of energy. how much energy would a cheetah acquire after it ate a zebra that consumed the grass?\n30 kj\n300 kj\n3,000 kj\n30,000 kj

Answer

Answer:

A. 30 kJ

Explanation:

Step1: Recall energy - transfer rule

In a food - chain, only about 10% of the energy is transferred from one trophic level to the next.

Step2: Identify trophic levels

The grass is a producer (first trophic level) with 30,000 kJ of energy. The zebra is a primary consumer (second trophic level) that eats the grass. The cheetah is a secondary consumer (third trophic level) that eats the zebra.

Step3: Calculate energy at zebra level

When the zebra eats the grass, it gets 10% of 30,000 kJ. Using the formula $E_{zebra}=0.1\times E_{grass}$, we have $E_{zebra}=0.1\times30000 = 3000$ kJ.

Step4: Calculate energy at cheetah level

When the cheetah eats the zebra, it gets 10% of the zebra's energy. Using the formula $E_{cheetah}=0.1\times E_{zebra}$, we have $E_{cheetah}=0.1\times3000=30$ kJ.