Taken from Nail thoSe McQs! PriMary ScieNce UPPer Block 5/6
1. The graph below shows the number of trees in a rain forest over a few weeks.
Number of trees
Weeks
X
Y
1 2 3 4
What could be the most likely cause for the dip in the number of trees from X to Y?(1) There was insufficient sunlight in that area.(2) The trees were chopped down by a woodcutter.(3) A fire broke out in the rainforest.(4) There was a sudden increase in the number of carnivores. ( )
2. Which of the following human activities has an undesirable impact on the environment?(1) Planting more trees in the garden(2) Using the fan instead of the air conditioner(3) Taking the public transport to work instead of driving(4) Using aerosols containing CFCs at home ( )
3. The following statements about global warming and its effects are not in order.
A Level of sea rising
B Gases trap heat preventing it from escaping into the space
C Increased burning of forests and fossil fuels
D Icebergs melting
E Greenhouse gases released into the atmosphere
F Global temperature rises
Which one of the following shows the correct sequence of events that occur during global warming?(1) C, B, E, F, D, A(2) C, E, B, F, A, D(3) C, E, B, F, D, A(4) D, C, E, F, B, A ( )
4. In 1937, the Bali tiger was declared extinct. Which of the following are most likely the factorscontributing to the extinction of the Bali tiger?A. The Bali tigers were hunted for their body parts.B. The Bali tigers fed on animals causing local extinction.C. Their habitats were destroyed due to human activities.D. The Bali tigers were culled as they were perceived to be destructive to mankind.
(1) A and B only(2) A and C only(3) A, C and D only(4) A, B, C and D ( )
Answers: 1. 3 2. 4 3. 3 4. 3
SAPSCSP5&6_W52Page 2/7
Taken from Nail thoSe McQs! PriMary ScieNce UPPer Block 5/6
Taken from Nail thoSe McQs! PriMary ScieNce UPPer Block 5/6
1. The environmental information below was found on a sticker on the aerosol spray can.
It contains no CFC (chlorofluorocarbons). The spray can is made from 28% recycled steel.
Which of the statements is/are correct about the aerosol spray can?A. It is harmless to the environment when the aerosol spray is used.B. Using the above aerosol spray will help to heal the ozone layer.C. It is environmentally friendly to use the aerosol spray as it is made from recycled material.D. The aerosol spray can be reused after it is finished.
(1) C only(2) A and C only(3) B, C and D only(4) A, B, C and D ( )
2. Over the years, scientists have been inventing new methods of producing food of better quality.Biotechnology is one such field of study that has helped man in this area. Which of the following areproducts of biotechnology?A. fermented food like yoghurtB. pest-resilient cropsC. brewing of beerD. production of antibodies from the designing of organisms
(1) A and B only(2) B and C only(3) A, B and C only(4) A, B, C and D ( )
Taken from Nail thoSe McQs! PriMary ScieNce UPPer Block 5/6
1. Which of the following measures will help reduce the level of pollutants emitted into theenvironment?(1) Buy more local produce than foreign ones(2) Allowing factories to dispose wastes only during the night(3) Construct more wooden houses instead of brick ones(4) Dumping rubbish into the sea instead of the rivers ( )
2. The chart below shows some human activities which have undesirable effects on the earth.
P
Q
R
SExposed soil is vulnerable to rain
Soil is not as fertile as before
Number of trees decreases
Production of more carbon dioxide
More glaciers and icebergs melt
More heat from the sun is trapped
Which of the following could represent P, Q, R and S correctly?
P Q R S
(1) Deforestation Soil erosion Global warming Burning fossil fuels
(2) Deforestation Soil erosion Burning fossil fuels Global warming
(3) Burning fossil fuels Global warming Deforestation Soil erosion
3. The government has been taking measures to curb water pollution. However, not all measuresare successful at preventing the locals from dumping their wastes into the water bodies. Which ofthe following measures will be more effective in deterring the locals from dumping wastes in aninappropriate manner?A. Create more space to build landfillsB. Impose heavy fines on those who dump rubbish into water bodiesC. Educate the locals on other proper ways of disposing their rubbishD. Produce more biodegradable materials
(1) A and C only (3) A, B and C only(2) B and C only (4) A, B, C and D ( )
(d) Which river is the most likely one to run through a public park which is a popular picnic spot?Explain your answer. [2m]
(e) River D is covered by a very thin layer of oil although no oil spills have occurred in the sea it isconnected to. What is a possible reason for the presence of oil? [1m]
(f) What is the difference between rivers E and F? [1m]
(g) In which river, E or F, would live animals survive for a longer time? Explain your answer. [3m]
Man and His Environment
Answers: 1. (a) Soil from a plot of land next to the river could have been washed into the water due to soil erosion. The soil has been mixed with the river water to form mud. 1. (b) The soil that has been eroded from the land and has gone into the river may be fertile soil containing mineral salts. This encourages the growth of surface water plants. 1. (c) Untreated sewage could have been discharged into river B, causing the smell. (Accept any other reasonable answers. Alternative answers can be animal wastes from a nearby farm / rotting food products from a nearby wet market.) 1. (d) It is river C because the litter found in it is most likely left behind by inconsiderate people after their picnics. 1. (e) An environment officer could have sprayed a thin layer of oil on the water surface to prevent mosquitoes from breeding which would otherwise lead to the spread of dengue fever. 1. (f) River F contains only live animals while river E contains both live animals and live plants. 1. (g) It would be river E. The live plants in river E would photosynthesize and give out oxygen for the animals to respire. Furthermore, the carbon dioxide given out by the animals would be taken in by the plants. This would help to maintain a balance in the essential gases needed by both plants and animals for survival.
Taken from ScieNce ProceSS SkillS UPPer Block 5/6SAPSCSP5&6_W52
