Trophic levels, gross and net primary production

Overview

Trophic level, trophic position of an animal that eats a herbivore and gross primary production.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   What is a trophic level?

   Model answer

   A trophic level is a feeding level in a food chain, occupied by organisms that are the same number of feeding steps away from the producers.

2. 2

   Which organisms occupy the first trophic level?

   Model answer

   Primary producers occupy the first trophic level.

3. 3

   Name the trophic position of an animal that eats a herbivore.

   Model answer

   An animal that eats a herbivore is a secondary consumer and occupies the third trophic level.

4. 4

   Which organisms are the tertiary consumers of a food chain?

   Model answer

   Tertiary consumers are the animals that feed on secondary consumers, and they occupy the fourth trophic level.

5. 5

   Where do detritivores and decomposers fit into a scheme of trophic levels?

   Model answer

   They form a level of their own, feeding on the dead material and waste produced at every other level.

6. 6

   What is gross primary production?

   Model answer

   Gross primary production is the total amount of chemical energy fixed by the producers of an area by photosynthesis in a given time.

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