Download BIOLOGY form 4 Chapter 8 PDF

TitleBIOLOGY form 4 Chapter 8
File Size1.6 MB
Total Pages37
Document Text Contents
Page 1

SULIT 4551/2

Chapter 8:Dynamic Ecosystem 2014




Module Biology Trail Paper Collection
4551/2 SULIT

1

8.1 The abiotic and biotic component of the environment

the abiotic factors of an ecosystem



No Marking scheme Marks

(a) Abiotic component and biotic component affect the growth of plants in zone A and zone B

(i)Name one abiotic component and one biotic component in the diagram

Abiotic component: gradient/steepness of the slope

Biotic component: Small insects / animal





1

1







2

(b) (ii)Explain how the abiotic component and biotic component in (b)(i) affect the growth of

plants in zone A zone B

F1-The steepness of the slope in zone A is higher than zone B

P1- In zone A, steep slope cause rapid drainage and run-off

F2-The soil layer in zone A is thinner and drier

P2-zone A has less plants compare to zone B

F3-Zone B has higher population of small animals than zone A

P3-Small animal like the earth worm feed on the rotten /dead/plants leaves

P4-Th activities of earthworm increase the organic substances/fertility in the soil

P5-Oraganic substances make the soil in zone B more suitable/fertile for plants growth







1

1

1

1

1

1

1



1





















8

Page 2

SULIT 4551/2

Chapter 8:Dynamic Ecosystem 2014




Module Biology Trail Paper Collection
4551/2 SULIT

2

Aspect Marking Scheme

Information

from the

food web



Based on Figure 3, name the producers in the paddy field ecosystem. 1

Paddy plant

What name is given to a chart of feeding relationships as shown in diagram 1

Food web

(ii) Name one top carnivore observed by the student 1

Snake

Give two ways in which energy may be lost in the food web. 2

(i) respiration

(ii) excretion

(iii) defaecation

Diagram 4.1 shows the energy flow form one trophic level to the next

\













Based on diagram 4.1

(i) State how the energy is lost to surroundings 1

As heat during respiration //being used during growth/ cell division / reproduction















Grass Goat

90% energy lost to the surroundings

Page 18

SULIT 4551/2

Chapter 8:Dynamic Ecosystem 2014




Module Biology Trail Paper Collection
4551/2 SULIT

18

No Marking scheme Marks

(b)


Discuss the importance of the ecosystem shown in Diagram 8 to the environment and economy

of our country

-F: resource for timber used in building industry

- P : has many varieties of species of mangrove trees

- F: Mangroves protect the coastlines and prevent coastal erosion.

- P: The roots of mangrove trees act as wavebreakers which stabilise the coastlines.

- F:: Mangrove swamps are good breeding grounds

- P: The calm water and prop roots shelter thespawns from predators

- F: Serve as habitat for many species of birds,amphibians and reptiles.

- P: The habitat provides food, shelter, living space,and breeding sites for these animals.

- F: Serve as natural barriers against torrentialstorms and tsunamis

- P: The trees block the water from flooding theland during a storm.



















1

1

1

1

1

1

1

1

1

1

































6


Explain the adaptive characteristic of an organ P,,sand T that enable the mangrove trees to survive at the

swampy seashore 10

Page 36

SULIT 4551/2

Chapter 8:Dynamic Ecosystem 2014




Module Biology Trail Paper Collection
4551/2 SULIT

36

The use of microorganism in biotechnology



Biotechnology is the application of organisms or microorganisms or their biological

Processes in the production of materials for use in medicine and industry.

Discuss the uses of microorganisms in

Uses (F) Explanation (E)

Waste treatment


P1- rich in organic matters, bacteria and microorganisms

P2- (in oxidation pond)the sewage is decomposed by(millions) of aerobic bacteria(in

the presence of oxygen)

P3- Decomposed sewage/sludge settled to the bottom of the pond

P4- fermentation takes place at sedimentation tanks using anaerobic bacteria

P5- produce methane/carbon dioxide/minerals

P6- digested sludge use as fertilizers

Food processing


F: Use of yeast in making of bread and cake

P: Fermentation by yeast produces carbon dioxidewhich makes dough rise.

F: Beer brewed from barley/ wine from grape juice

P: Yeast fermentation of the sugar in barley/ grape produces ethanol

F: Yoghurt is made from fermentation of milk bybacteria / Lactobacillus sp. /

Streptooccusthermophillus

P: Bacteria converts sugar into lactic acid whichcoagulates the milk to / form

yoghurt

F: Cheese made by adding bacteria and rennin to milk.

P: Milk separates into curd and whey/ coagulates

F: Soya sauce made from fermentation of soya bean by fungi

P: Yeast fermentation breaks down soya bean and gives it flavour

Similer Documents