Science

Test Description: Chapter 20 Vocabulary

Instructions: Answer all questions to get your test result.

1) nonliving thing in an ecosystem

2) layer of gases surrounding Earth

3) living thing in the ecosystem

4) average weather conditions in an area over time

5) living and nonliving things in a given area

6) unicellular organisms without a membrane-bound nucleus

7) process during which water vapor changes into a liquid

8) cannot be separated by chemical means

9) process during which liquid water changes into water vapor

10) process that changes atmospheric nitrogen into compounds usable by living things

11) water that falls from the clouds to the Earth's surface

12) to set free

13) process using chemical energy in matter to make food

14) model showing how energy flows in an ecosystem

15) model of energy transfer showing how the food chains in a community are interconnected

16) model showing the amount of energy available in each step of a food chain

17) series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen


*select an answer for all questions

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