Question

use the ten percent rule to complete each part of the question. select the correct answer from each drop - down menu. (2 points)
a grassland ecosystem has 10,000 kg of energy stored in the producer level
the amount of energy available to primary consumers is (1) kg.
the amount of energy available to secondary consumers (2) kg.
this pattern explains why the biomass pyramid becomes (3) at higher trophic levels.

Explanation:

Step1: Apply 10% rule to producers

Primary consumers get 10% of producer energy:
$\frac{10}{100} \times 10,000 = 1,000$ kg

Step2: Apply 10% rule to primary consumers

Secondary consumers get 10% of primary consumer energy:
$\frac{10}{100} \times 1,000 = 100$ kg

Step3: Describe biomass pyramid trend

Energy loss at each trophic level means biomass decreases at higher levels.

Answer:

1. The amount of energy available to primary consumers is 1,000 kg
2. The amount of energy available to secondary consumers is 100 kg
3. This pattern explains why the biomass pyramid becomes smaller/narrower at higher trophic levels