GRADE 8 BIOLOGY REVISION QUIZ 1 - 2025 CDOWN

Why does a food chain begin with plants?

• They produce food from light energy, carbon dioxide, and water.

• All the species of the ecosystem depend on them for food.

• They do not depend on other living creatures for food.

• All of the above

A primary consumer is a

• meat eater that eats primary consumers.

• plant eater that eats tertiary consumers.

• plant eater that eats producers.

• meat eater that eats secondary consumers.

Organisms that feed only on other consumers are

• herbivores.

• omnivores.

• carnivores.

• predators.

A(n) ___ is the depiction of what eats what.

• food web

• biosphere

• decomposer

• energy pyramid

Organisms such as green plants or algae are

• decomposers.

• herbivores.

• consumers.

• producers.

Which organism is an example of an autotroph?

• oak tree

• butterfly

• mushroom

• dog

Predators such as foxes, owls, woodpeckers, and skunks make up the ___ of a deciduous forest.

• tertiary consumers

• secondary consumers

• primary consumers

• producers

Which is an autotroph?

• producer

• consumer

• scavenger

• decomposer

What organism cannot make its own food?

• heterotroph

• chemotroph

• producer

• autotroph

Suppose that the pesticides used by humans have killed many of the herbivores in an ecosystem. What will most likely happen?

• The populations of plants will increase, and the populations of carnivores will decrease.

• The populations of carnivores will increase, and the populations of plants will decrease.

• The populations of both plants and carnivores will decrease.

• The populations of both plants and carnivores will increase.