Question

1. all of the following are heterotrophs except ____________. *

algae
decomposers
carnivores
scavengers

1. if the primary consumer has 1000 j of energy, how many j of energy will the tertiary consumer get? *

10000
1000
100
10

Explanation:

14.

Heterotrophs cannot produce their own food and rely on other organisms. Algae are autotrophs as they can perform photosynthesis to make their own food. Decomposers, carnivores, and scavengers are heterotrophs.

Step1: Recall energy - transfer rule

Only about 10% of energy is transferred from one trophic level to the next.

Step2: Calculate energy for secondary consumer

If primary consumer has 1000 J, secondary consumer gets 10% of 1000 J, which is $1000\times0.1 = 100$ J.

Step3: Calculate energy for tertiary consumer

Tertiary consumer gets 10% of energy of secondary consumer. So it gets $100\times0.1=10$ J.

Answer:

Algae

7.