Question

questions 2 and 3 refer to the following. algae in an aquatic food chain convert solar energy into 93,000 kilocalories of plant tissue. 2 mark for review which of the following values best represents the amount of energy available for primary consumers in the food chain? a 930 kilocalories b 9,300 kilocalories c 93,000 kilocalories d 930,000 kilocalories

Explanation:

Step1: Recall energy - transfer rule

In an aquatic food - chain, only about 10% of the energy is transferred from one trophic level to the next. Algae are primary producers. Primary consumers eat the algae.

Step2: Calculate energy available for primary consumers

If algae convert 93,000 kilocalories of solar energy into plant tissue, and primary consumers get 10% of this energy, we calculate 10% of 93,000. The formula for finding a percentage $p$ of a number $n$ is $n\times\frac{p}{100}$. Here, $n = 93000$ and $p = 10$. So, $93000\times\frac{10}{100}=9300$ kilocalories.

Answer:

B. 9,300 kilocalories