Biology FSC Part 2 Chapter 26 Online MCQ's Test With Answers

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Biology FSC Part 2 Chapter 26 Online MCQ's Test

Sr. # Questions Answers Choice
1 The total energy from the sun is happened by the producers in an ecosystem is about? 20 % 10 % 5 % 1 %
2 The best way to increase food production from ecosystem view point is: To increase cultivable land by clearing forest Use of excessive fertilizers Use of high quality pesticides Use of genetically improved varieties of seeds
3 Which of the following is NOT recycled in ecosystem? Carbon Sulphur Energy Water
4 What would be expected to happen if all the nitrogen-fixing organisms ceased to exist? There would be no significant change in number of animals The total number of biomass would be reduced All organisms would die out The nitrogen level of the atmosphere would be increase
5 Which statement defines the net primary production in an ecosystem over a given time period? The total amount of organic matter in the plants in excess of that used in respiration The total amount of organic matter used in respiration by all the organisms present The total amount of photosynthesis product from all plants The total amount of organic matter in all organisms present
6 The amount of energy left plants have met their respiratory needs is net eprimary production , which shows up as plant: Respiration rate Photosynthesis Biomass Food reserve
7 In succesion lithoseres takes place on: Sand Water Forest floor Bare rocks
8 A change in the community structure of an ecosystem over a period of time is: Ecological niche Ecological mutation Succession Genetic Drift
9 At the time of independence in 1947 the population of pakistan was 10 m 20 m 25.7 m 32.5 m
10 The decline in thickness of the ozone layer is caused by increasing level of Chlorofluorocarbon Nitrogen Chlorine Carbon dioxide
11 Rain that falls on high areas such as mountains possesses large amount of garvitational Heat energy Kinetic energy Electrical energy Potential energy
12 Oxone molecule is made up by binding of three atoms of Nitrogen Oxygen Hydrogen Carbon
13 Only 30% of the earth is dry land the remainder being covered with Water Air Trees Grass
14 Modern man is called Homo erectus Homo habilis Homo sapiens Homo neanderthalensis
15 In oceans especially in tropical regions temperature of surface water is about 10<sup>o</sup>C 15<sup>o</sup>C 25<sup>o</sup>C 35<sup>o</sup>C
16 A natural process in which surface soil is removed by the action of water or wind is Corrosion Attrition Erosion Weathering
17 Each nuclear power station only can last for about 10 years 20 years 30 years 40 years
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