MCQ-4: Human Influences on Ecosystems
There are twenty questions in this quiz. Select the correct answer from the given choices.
0 of 20 Questions completed
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
0 of 20 Questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Unfortunately, you have not scored the minimum marks required to pass the quiz. You may review the explanations provided below by clicking on the “View Questions” button before taking the quiz again. You need to score a minimum of 50% to pass, and minimum of 70% to get a Certificate of Completion.
Congratulations!!! You have passed the Quiz. To get a Certificate of Completion, you need to score a minimum of 70%. You may review the explanations provided below by clicking on the “View Questions” button before taking the quiz again. The more you review and practice, the better you will get at it.
Congratulations!!! You have passed the Quiz with a good score. To get a Certificate of Completion, you need to score a minimum of 70%. You may review the explanations provided below by clicking on the “View Questions” button before taking the quiz again. The more you review and practice, the better you will get at it. We have raised the bar because we want you to SUCCEED with brilliant scores.
Congratulations!!! You have passed the Quiz with a score >= 70% and are eligible to get a Certificate of Completion.
|Table is loading|
|No data available|
Question 1 of 20
1. Question1 point(s)
Over-use of fertilisers on farmland causes the chemicals in the fertilisers to be washed into ponds and lakes.
This causes eutrophication resulting in the following events.
- algae grow
- fish die
- bacteria grow
- oxygen decreases
What is the correct sequence of these events?CorrectIncorrect
Question 2 of 20
2. Question1 point(s)
The concentration of a pesticide in the tissues of the organisms in the following food chain was measured.
plants → small fish → large fish → birds of prey
Which bar on the chart represents the large fish?CorrectIncorrect
Question 3 of 20
3. Question1 point(s)
Which activity will be least likely to lead to the extinction of species?CorrectIncorrect
Question 4 of 20
4. Question1 point(s)
The diagram shows the age structure of a human population.
Which age group has the largest number of people?CorrectIncorrect
Question 5 of 20
5. Question1 point(s)
What is a reason for conserving plant species?CorrectIncorrect
Question 6 of 20
6. Question1 point(s)
What is reduced after deforestation?CorrectIncorrect
Question 7 of 20
7. Question1 point(s)
The graphs show the number of carnivores in a habitat over a period of time. At time X the herbivores in their food chain are removed from the habitat.
Which graph shows the effect of this on the number of carnivores?
Question 8 of 20
8. Question1 point(s)
Which statement describes the effect of predation and disease on a population?CorrectIncorrect
Question 9 of 20
9. Question1 point(s)
What is not a reason for having conservation programmes?CorrectIncorrect
Question 10 of 20
10. Question1 point(s)
When raw sewage is discharged into a stream, what is a result of eutrophication?CorrectIncorrect
Question 11 of 20
11. Question1 point(s)
Some examples of the waste products of human activity are discarded household rubbish, excess fertiliser, industrial chemicals and untreated sewage.
Which of these can both cause increased growth of aquatic plants?CorrectIncorrect
Question 12 of 20
12. Question1 point(s)
The action of which type of bacteria would cause soil to be lacking in nitrates?CorrectIncorrect
Question 13 of 20
13. Question1 point(s)
What is used to help sustain fish stocks?
education legal quotas eating more fish restocking A ✓ ✓ ✓ x B ✓ ✓ x ✓ C ✓ x ✓ ✓ D x ✓ ✓ ✓CorrectIncorrect
Question 14 of 20
14. Question1 point(s)
What is a direct result of deforestation?CorrectIncorrect
Question 15 of 20
15. Question1 point(s)
The table shows the ability of three species of fish and their eggs to survive in water at different pH levels.
If the eggs do not survive offspring cannot be produced.
pH 6.5 6.0 5.5 5.0 4.5 4.0 trout ✓ ✓ ✓ ✓ ✓ x sea bass ✓ ✓ ✓ x x x perch ✓ ✓ ✓ ✓ x x fish eggs ✓ ✓ ✓ x x x
x = do not survive
A lake at pH 6.0 contains breeding populations of all three fish.
If acid rain causes the pH to fall to 5.0, which outcome would be likely to occur?CorrectIncorrect
Question 16 of 20
16. Question1 point(s)
Pieces of plastic between 1 μm and 1 mm in size are called microplastics. Microplastics are put into some face creams and are produced during clothing manufacture. They can now be found in increasing quantities in oceans all over the world.
As well as their small size, which other property of microplastics make them dangerous to living organisms?CorrectIncorrect
Question 17 of 20
17. Question1 point(s)
In 1991 there were only fourteen Daviesia cunderdin plants.
What happens to a plant population that becomes very small?CorrectIncorrect
Question 18 of 20
18. Question1 point(s)
The diagram shows a food web in a woodland.
What is most likely to happen if all of tree type X is removed by humans?CorrectIncorrect
Question 19 of 20
19. Question1 point(s)
The increased availability of nitrates in rivers and lakes can result in the death of fish.
Which statement explains why fish die in rivers and lakes containing a high concentration of nitrates?CorrectIncorrect
Question 20 of 20
20. Question1 point(s)
What are the possible effects of deforestation?
loss of soil flooding decrease in atmospheric
A yes yes no B yes no yes C no yes no D no no yesCorrectIncorrect