Physical Science Review for Semester Test--Fall

The respiration of consumers uses this gas and releases carbon dioxide as a by-product.

• carbon dioxide

• oxygen

• nitrogen

• hydrogen

Food chains always start with a/an _______________.

• consumer

• producer

• omnivore

• carnivore

These organisms feed off of dead material and release the carbon back into the cycle.

• producers

• consumers

• decomposers

• animals

What does the biomass pyramid represent?

• How much energy is passed from one trophic level to the next.

• How many organisms occupy each trophic level.

• How long the food chain is.

• The mass of all the living organisms within each trophic level.

Herbivores eat _____________.

• other herbivores.

• plants.

• animals.

• omnivores.

This process, used by producers, releases oxygen into the atmosphere as a by-product.

• aerobic.

• producer.

• photosynthesis.

• cellular respiration

Plants, also called this, use carbon dioxide to make their own food.

• consumers

• producers

• decomposers

• animals

Abiotic factors are

• living things in an ecosystem.

• nonliving things in an ecosystem.

Biotic factors are

• living things in an ecosystem.

• nonliving things in an ecosystem.

The burning of these has put more carbon back into the atmosphere than can be naturally recycled.

• wood

• paper

• fossil fuels

• algae