If the grass contains 100,000 kcal of energy, how much energy will the zebra receive? 100,000 kcal 10,000 kcal 1,000 kcal 100 kcal

This relates to the concept of trophic levels. Grass is a primary producer, whereas zebra would a primary consumer, situated one trophic level above grass. If you work on the assumption that 10% of energy is transferred from one trophic level to the next, then the zebra would obtain 10% of 100,000 kcal, i.e. 10,000 kcal.

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The answer is a. i hope this