Grade 7 Cycles Quiz Flashcards Preview

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Flashcards in Grade 7 Cycles Quiz Deck (16):
1

Animals use oxygen in the process of (blank) and make more CO2

Respiration

2

The (blank) is the main regulator of CO2 in the atmosphere because CO2 dissolve easily in it

Ocean

3

In the past huge deposits of carbon were stored as dead plants and animals (blank)

Decayed

4

Today these deposits are burned as fossil fuels which include (blank), (blank), and (blank)

natural gas, oil, and coal

5

More CO2 is released in the atmosphere today than in the past because of (blank)

Burning of fossil fuels

6

Another natural source of CO2 is (blank)

Volcanoes

7

Too much CO2 is responsible for the (blank) affect

Greenhouse

8

Write the equation for photosynthesis

CO2 plus H2O = sugar plus oxygen

9

Our atmosphere is (blank) nitrogen gas

78%

10

Animals and plants cannot directly use all the nitrogen found in our (blank)

Atmosphere

11

Only special bacteria can directly use nitrogen in our atmosphere and fix it so other organisms can benefit. These bacteria are called (blank) bacteria

Nitrogen fixing

12

Higher organisms use nitrogen to make their (blank)

Proteins

13

Animal waste decay by the action of bacteria which create (blank) and (blank) products rich in nitrogen and useful for plants to use again

Ammonia and nitrate

14

(Blank) bacteria in the soil can break down the ammonia into the gaseous form of nitrogen which is not available for use by plants and animals

Denitrificating

15

In another part of the cycle animals eat (blank) containing nitrogen which is again returned to the soil by (blank) or decaying (blank)and (blank)

In another part of the cycle animals eat plants which contain nitrogen which is again returned to the soil by animal waste and or decaying plants and animals

16

Plants use CO2 in the process of (blank) to make (blank) and oxygen

Photosynthesis and sugar