Science 1.19 Unit Test Study Guide

Which statement is true?

• Water is important to some organisms.

• Some substances must be dissolved in water before they can be used.

• Plant cells are unaffected when water is scarce.

Which statement describes a response to external stimuli?

• a rabbit runs away from a fox that is chasing it

• a woman drinks water when she is thirsty

• a boy eats food when he is hungry

Which stimulus is an example of an internal stimulus?

• a sudden change of air temperature

• a decrease in oxygen levels in the blood during exercise

• an artificial light that attracts insects

Which choice is a biotic factor of an ecosystem? 

• sun

• air

• ants

Which place describes a community?

• a forest of birds, insects, and squirrels

• the desert

• a hole in which a snake lives

What is a key element found in all carbohydrates, lipids, proteins, and nucleic acids?

• ammonia

• carbon

• nitrogen

Which item is an example of a producer?

• ant

• fern

• sun