SMK Seri Titiwangsa , Jalan Temerloh, 53200 Kuala Lumpur

INTERVENTION-BIOLOGY CHAPTER 8

CHAPTER 8 : DYNAMIC ECOSYSTEM

1. The following information is related to a process that occurs in the ecosystem

1 The pioneer species is replaced by other species

2 The process occurs gradually over a period of time

3 The process ends with a climax community

What is the process?

A colonisation B competition C succession D evolution

2. From the information given above, suggest the most effective way to overcome the problem.

A Set up mouse traps C Increase the number of owls in the estate

B Poison the rats D Destroy the rats habitat

3. The diagram represents the flow of energy in a typical ecosystem.

Which two boxes represent carnivorous organisms?

A 1 and 2C. 2 and 3

B 3 and 4D. 4 and 5

4. An insecticide was sprayed to kill the caterpillars. In which organisms would the highest level of insecticide accumulate after a period of time?

A Deer C. rabbits

B Foxes D.pigeon

5. In the effort to estimate the population of rats in a paddy field, a farmer set up some traps and managed to capture 22 rats. The farmer tagged the rats by putting a small metal ring on the rats feet and then released them. After 2 days, the farmer set up the trap again and this time he managed to trap 20 rats. Among the trapped rats, 4 of them were found with the ring. What is the estimated population of the rats in the paddy field?

A. 38 C. 110

B. 46 D. 168

6. Which of the following pairs of organism practises parasitism?

A Sea anemone and hermit crab C Barnacles and whale

B Ticks on a cats body D Green algae and fungi

7. The diagram shows the energy losses and gains of a rabbit.

Which of the following shows the percentage loss of heat?

% energy used for growth and repair % energy lost as heat

A 10 30

B 30 10

C 30 60

D 60 30

The diagram shows part of a food web for a fresh water pond.

8. Which organism is a primary consumer?

A Pond snails B Pondweed C Water beetles D Water mites

9. Which of the following show the changes of rabbit and fox population in an ecosystem?

A.

C.

B.

D.

10. The diagram shows the flow of energy in a typical ecosystem?

(a) Fill in the blanks.

Terms

Represented by Box

Definition

Producer

A

Known as a. as they produce their own food

Consumer

Herbivore

Carnivore

Omnivore

B,C, D

Known as h. as they feed on producers or other consumers

..

Feed on p.. such as plants

Eg: Cattle

C

Feed on animals Eg : ..

...

Feed on . and

Eg: crow

.

E

.

Breaks down complex organic compounds into simpler substance

Eg: and

(b) Which box represents the trophic level which receives the least energy?

(c) Which box represents the largest total mass of living organisms?

(d) Which box represents the secondary consumers?

...

11. The figure shows part of a food web.

Carnivorous Bird

Bird A Bird B Bird C Bird D Bird E

Small fish

Zooplankton Oysters Snails

Algae Garden Plants

(a) The sun is the ultimate source of energy of the food web. Name the process by which the

suns energy enters the ecosystem through the algae and leaves of garden plants.

.

(b) (i) Name the biological relationship between birds D and E.

(ii) Describe and explain one possible effect on the population of bird D if there is a great

reduction in the population of bird E.

(c) What is the term used to describe the diet of the small fish and the snail

(i) small fish : (ii) snail :..

(d) (i) Name two groups of organisms that are not shown in the diagram but they are very

important to maintain the food web shown above.

1. 2.

(ii) How do they help to maintain the above ecosystem in a balanced state.

(e) (i) Construct one food chain of five organisms which are shown in the above food web.

(ii) What does the arrows between organisms in a food chain indicate.

.

(iii) State two ways in which energy is lost along the food chain.

1.

2. .

Colonisation and succession in Mangrove swamp

12. Figure below shows the geographical distribution of mangrove trees along the east

coast.

1

(a) (i) Name the mangrove trees in zone A to D.

A : B :

C : D : [4 marks]

(ii) Among the mangrove trees stated in (a) (i), which is the pioneer species?

[2 marks]

(b) State two problems faced by the pioneer species in the colonization of

swampy area.

... ......................................................................................................................................

[2 marks ]

(c) Explain two adaptive characteristics that enable the pioneer species to survive in

the swamp area.

....

. ..

...................

[2 marks]

(d) (i) What is meant by viviparous seedlings?

[ 1 mark ]

(d) (ii) What is the benefit of this to the mangrove plant?

.

[1 mark]

13. Figure above shows an oil palm estate. An oil palm estate is identified as a habitat for owls and rats. The manager of oil palm estate plans to use biology control to control the population size of rats which are damaging the oil palm in the estate.

Based on ecological studies, some students have carried out a study to estimate the size of the rats population between the area of estate. The result obtained are recorded in Table 1

Steps in the collection of samples

Station X

Station Y

Number of rats captured, markes and released

110

70

Number of rats recaptured 3 days later

130

50

Number of marked rats

60

25

(a) What technique is used for estimating the population of the rat?

..

1 mark]

(b) (i) Give two characteristics of the material used for marking the rat.

..

..

.

2 marks]

( b )(ii) Where will you release the rat after they are marked?

..

..

[1 mark]

(c) Why are the rat caught again after three days?

[1 mark]

(d) Estimate the population of the rat in station X and station Y.

.

..

........

.

[2 marks]

(e) Give three reasons for the difference in the population of the rat in two stations. .......

[3 marks]

Energy from sun light

B

A

2

3

1

5

C

4

Oil palm estate owners experienced huge losses due to attacks from pests especially the rats.

B

A

D

E

D

E

C

PAGE

8