Ethiopia Grade 12 Biology: Unit 2 Ecology Question Answers

Ethiopia Grade 12 Biology: Unit 2 Ecology Question Answers: Unit 2 (The ecology and uses of bacteria) Question Answers for Ethiopian University Entrance exam. This page contains multiple choice question answers.

By the end of this section you should be able to: Explain the need for the recycling of materials through ecosystems.  Illustrate the nutrient cycle.  Describe and diagram the water, carbon, nitrogen, sulphur and phosphorus cycles. State that materials do not always remain within an ecosystem

Unit 2 Ecology Question Answers

  • Cycling matter through ecosystems
  • Ecological succession
  • Biomes
  • Biodiversity
  • Populations

Ethiopia Grade 12 Biology: Unit 2 Ecology Question Answers

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Ethiopia Grade 12 Biology: Unit 2 Ecology Question Answers

Ethiopia Grade 12
Subject: Biology
Unit No: 2
Topics: Ecology 

Total Questions: 35
Answers Available: YES
Explanation: Yes

1 / 35

Which of the following is released by the decomposers?

2 / 35

The process that fixes carbon atoms from an inorganic source (carbon dioxide) into organic compounds (for example, glucose) is called ____ ?

3 / 35

In the sulphur cycle, hydrogen sulphide is oxidised to sulphur by:

4 / 35

A secondary succession differs from a primary succession to the same climax in that:

5 / 35

In the nitrogen cycle, nitrogen gas is returned to the atmosphere by:

6 / 35

Which of the following compound is caused by acid rain?

7 / 35

Which of the following is very important in the nitrogen cycle?

8 / 35

What is abiotic?

9 / 35

In an ecological succession:

10 / 35

Which of the following is an organism that breaks down dead organic matter and recycles it?

11 / 35

Which of the following comparisons of the phosphorus and carbon cycles is true?

12 / 35

Which of the following organisms could not synthesise without nitrogen?

13 / 35

Decomposers _____ and ______ are key in returning nutrients to the ecosystem.

14 / 35

In the nitrogen cycle, it is accurate to describe the conversion of ammonium ions to nitrate ions as an oxidation because the nitrogen atom in the ammonium ion:

15 / 35

The stages in a succession are referred to as:

16 / 35

What is the first stage in the nitrogen cycle?

17 / 35

Which of the following statements concerning the water cycle are true?

18 / 35

Phosphate is absorbed from the soil (or water) by plants.

19 / 35

Which of the following factors does not affect the type of climax community that develops?

20 / 35

Which type of bacteria reduces nitrate to nitrogen gas that escapes from the soil?

21 / 35

Which of the following is the best explanation for the fact that decomposers are found in the carbon, nitrogen, sulphur and phosphorus cycles?

22 / 35

The micro-organisms that break down dead matter are:

23 / 35

The final, most complex, state of succession is the ______ community.

24 / 35

Decomposers feed by:

25 / 35

All successions share which of the following features?

26 / 35

Which of the following is a legume plant?

27 / 35

What cycle does acid rain occur?

28 / 35

How are fossil fuels formed?

29 / 35

Which of the following statements about the nitrogen cycle is true?

30 / 35

The main processes involved in cycling carbon through ecosystems are:

31 / 35

Secondary successions to the original climax are usually much quicker than primary successions because

32 / 35

Which one of the following has the largest population in a food chain?

33 / 35

Which of the following process used by fungi to obtain nutrients from nonliving organic matter?

34 / 35

What is saprobiotic nutrition?

35 / 35

Carbon dioxide is removed from the atmosphere when

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