Scribd
Upload
175 views2 pages

Ecosystem Exam Questions Guide

This document contains questions about various ecosystems and the relationships within them. It asks the reader to: 1) Identify processes in nutrient cycles and explain how they work. It also asks about environmental problems caused by increases in atmospheric carbon dioxide. 2) Define ecosystem and community. It also asks the reader to construct pyramids showing the number and biomass of organisms within a hypothetical ecosystem. 3) Identify abiotic factors affecting plants and ways human activities can impact aquatic ecosystems. 4) Follow food chains and explain why insecticide concentrations increase at higher trophic levels. It also asks how closed ecosystems function. 5) Design experiments to study populations and estimate densities of organisms like grass

Uploaded by

JAPHET NKUNIKA
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
175 views2 pages

Ecosystem Exam Questions Guide

This document contains questions about various ecosystems and the relationships within them. It asks the reader to: 1) Identify processes in nutrient cycles and explain how they work. It also asks about environmental problems caused by increases in atmospheric carbon dioxide. 2) Define ecosystem and community. It also asks the reader to construct pyramids showing the number and biomass of organisms within a hypothetical ecosystem. 3) Identify abiotic factors affecting plants and ways human activities can impact aquatic ecosystems. 4) Follow food chains and explain why insecticide concentrations increase at higher trophic levels. It also asks how closed ecosystems function. 5) Design experiments to study populations and estimate densities of organisms like grass

Uploaded by

JAPHET NKUNIKA
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

Ecosystem Questions

Section A
1. Figure 3 shows the carbon cycle. Use it to answer
the questions that follow:
a. Name the processes J and K. (2 marks)
b. Mention one environmental problem that is caused by
increased amounts of carbon in dioxide in the atmosphere. (1 mark)

5. (a) Define the following terms: (i)


“ecosystem” (1 mark) (ii) “community”
(b) Suppose a particular ecosystem has 2
shrubs, 100 caterpillars and 3 birds,
construct a pyramid of: (i) number (1
(ii) biomass (1 mark)
6. (a) Mention one abiotic factor that affects plant growth. (1 mark)
(b) Give two way in which the activities of man can affect an aquatic ecosystem. (2 marks)
7. Figure 5 shows one of the nutrient cycles in nature. Use it to answer the questions that follow.
a. Name the processes taking place at F, Z and P. (3 marks)
b. Explain how the process at K takes place. (3 marks)
c. Under what conditions does the process at E take place? (1 mark)

8. Figure 11 is a diagram showing recycling of materials in an


ecosystem. Use it to answer the questions that follow.

a. What does F represent? (1 mark)


b. Explain how the producer benefits from the activities of organisms represented by letter E. (3 marks)
Ecosystem - Questions
Sir Nkunika 0888139623/0997318853
9. [2009-13]
Table 2 shows results of an analysis of water in a stream and the organisms present in it. The stream was sprayed
annually with an insecticide to kill larvae of mosquitoes. Use it to answer the questions that follow.

Table 2
Analysis Concentration of pesticide

Stream water 2

Water plants 500

Fish type A 27,000

Fish type B 115,000

Fish eagles 160,000

a. Write down a food chain that includes all the organisms shown in the table. (3 marks)
b. Why is the insecticide concentration in the fish eagles higher than in the water plants? (2 marks)
10. [2008-7]
Figure 6 shows a closed aquarium which was set up in the sun by a group of students. Use it to answer the questions
that follow.
a. Besides feeding relationship, explain how the pond weeds and
snails depend on each other in the aquarium.

b. If the following morning students observed that tadpoles and


water snails had died explain the cause of death.

11. 2007-5.
Student caught 64 grasshoppers in a school garden of area 32𝑚2 and
marked them with nail varnish. They released them into the same garden. After two hours the students captures 60
grasshoppers in the same area of which 12 had marks of nail varnish.

a. Name the sampling technique used by the students. (1 mark)


b. Calculate the total number of grasshoppers for this area. (3 marks)
c. Calculate the population density of the grasshoppers. (2 marks)

12. 2008-15.
Discuss the energy flow in a tropical woodland. Your answer should be in essay form. (10 marks)
13. 2003-18.
Design an experiment that would be used to estimate the density of grasshoppers in a school garden. (10 marks)

Ecosystem - Questions
Sir Nkunika 0888139623/0997318853

You might also like