B2 - Recycling Flashcards Preview

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Flashcards in B2 - Recycling Deck (16)
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1
Q

What is decay?

A

Rot or decompose through the action of bacteria and fungi..

2
Q

What are the name of two elements that are recycled?

A

Carbon dioxide and nitrogen.

3
Q

How much carbon dioxide does the atmosphere contain?

A

Around 0.035%.

4
Q

Why do plants need carbon dioxide?

A

Plants need carbon dioxide for photosynthesis.

5
Q

What are the ways carbon dioxide is put back into the atmosphere?

A
  • plants and animals respiring
  • decomposers such as bacteria and fungi respiring
  • burning of fossil fuels
6
Q

Why is limestone a bad choice to use in city buildings?

A

Acid rain erodes it very easily.

7
Q

Why is limestone a carbon sink?

A

It takes in carbon dioxide from the atmosphere.

8
Q

How much nitrogen is there in the earth’s atmosphere?

A

Around 78%.

9
Q

Why is nitrogen difficult for plants and animals to use?

A

It does not combine with other elements easily and is an unreactive gas.

10
Q

How can nitrogen be recycled?

A

Nitrogen in dead animals or plants can be recycled by decomposers.

11
Q

Write down two different types of decomposers.

A
  • bacteria

- fungi

12
Q

Why do plants and animals need nitrogen?

A

To make proteins for growth and making enzymes that control the reactions necessary for life.

13
Q

What do decomposers do?

A

They break down proteins in dead bodies and urea in liquid animal waste, releasing ammonia.

14
Q

What do nitrifying bacteria do?

A

Convert ammonia into nitrates.

15
Q

What do denitrifying do?

A

They break down nitrates in the soil and release nitrogen back in to the atmosphere.

16
Q

What do nitrogen fixing bacteria do?

A

They convert nitrogen gas into ammonia or nitrates and then into amino acids.