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

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

2 / 35

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

3 / 35

The micro-organisms that break down dead matter are:

4 / 35

All successions share which of the following features?

5 / 35

In an ecological succession:

6 / 35

What is abiotic?

7 / 35

How are fossil fuels formed?

8 / 35

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

9 / 35

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

10 / 35

What is the first stage in the nitrogen cycle?

11 / 35

What cycle does acid rain occur?

12 / 35

Which of the following organisms could not synthesise without nitrogen?

13 / 35

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

14 / 35

The stages in a succession are referred to as:

15 / 35

Which of the following is a legume plant?

16 / 35

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

17 / 35

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

18 / 35

The main processes involved in cycling carbon through ecosystems are:

19 / 35

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

20 / 35

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

21 / 35

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

22 / 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:

23 / 35

Decomposers feed by:

24 / 35

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

25 / 35

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

26 / 35

Which of the following compound is caused by acid rain?

27 / 35

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

28 / 35

Which of the following is released by the decomposers?

29 / 35

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

30 / 35

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

31 / 35

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

32 / 35

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

33 / 35

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

34 / 35

Carbon dioxide is removed from the atmosphere when

35 / 35

What is saprobiotic nutrition?

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