Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- What was the source of hydrogen for first photosynthetic organisms? 

a. Water 

b. Hydrogen present in soil 

c. Hydrogen sulphate 

d. Hydrogen sulphide 

Answer- Hydrogen sulphide

Que- Flagella might have arisen through the ingestion of 

a. Cyano-bacteria 

b. Spirochetes 

c. Chlamydomonas 

d. Paramecium 

Answer- Spirochetes

Que- Important point/s of Lamarck's theory 

a. Use and disuse of organs 

b. Inheritance of acquired characters 

c. Natural selection 

d. Both A and B 

Answer- Both A and B

Que- Who developed a theory of natural selection essentially identical to Darwin's 

a. Hardy-Weinberg 

b. Alfred Wallace 

c. Malthus 

d. Lyell 

Answer- Alfred Wallace

Que- Neo-Darwinism has integrated discoveries and ideas from 

a. Taxonomy 

b. Paleontology 

c. Genetics 

d. All of these 

Answer- All of these

Que- The actual remains or traces of organisms that lived in ancident geological times 

a. Vestigial remains 

b. Fossils 

c. Fuel 

d. None of these 

Answer- Fossils

Que- Most fossils are found in the 

a. Metamorphic rocks 

b. Soil 

c. Sedimentary rocks 

d. Volcanic mountains 

Answer- Sedimentary rocks

Que- Which statement is incorrect? 

a. Homologous organs are functionally different but structurally alike 

b. Analogous organs are functionally different but structurally alike 

c. Examples of homologous structures are arms of man, forelimb of cat, flipper of whale 

d. Examples of analogous structures are wings of bats, birds and insects 

Answer- Analogous organs are functionally different but structurally alike

Que- Analogous organs show 

a. Convergent evolution 

b. Divergent evolution 

c. Straight evolution 

d. Zig-zag evolution 

Answer- Convergent evolution

Que- In humans gill pouches have modified into 

a. Nose 

b. Ear 

c. Eustachian tubes 

d. External ear 

Answer- Eustachian tubes

Que- A group of interbreeding individuals belonging to a particular species and sharing a common geopraphic area is called 

a. Community 

b. Family 

c. Population 

d. Race 

Answer- Population

Que- Natural selection can amplify or diminish variations that are 

a. Non heritable 

b. Heritable 

c. Both heritable and non heritable 

d. Acquired 

Answer- Heritable

Que- Adaptations that an organism acquires by its own actions are 

a. Heritable 

b. Not heritable 

c. Can be made heritable through some modifications 

d. Both heritable and not heritable 

Answer- Not heritable

Que- A group of populations that have the potential to interbreed in nature is 

a. Genus 

b. Family 

c. Species 

d. Community 

Answer- Species

Que- The total aggregate of genes in a population at any one time is called population's 

a. Genome 

b. Genomic library 

c. Genetic group 

d. Gene pool 

Answer- Gene pool

Que- If all members of a population are homozygous for the same allele, that allele is said to be 

a. Fixed in gene pool 

b. Mobile in gene pool 

c. Random in gene pool 

d. Stationary in gene pool 

Answer- Fixed in gene pool

Que- According to Hardy-Weinberg theorem, frequencies of alleles and genotypes in a population's gene pool remain 

a. Mobile 

b. Stationary 

c. Constant 

d. Constant unless acted upon by agents other than sexual recombination 

Answer- Constant unless acted upon by agents other than sexual recombination

Que- The ultimate source of all changes is 

a. Mutation 

b. Migration 

c. Genetic drift 

d. Selection 

Answer- Mutation

Que- Disturbance in the gene pool is created by 

a. Emigration 

b. Immigration 

c. Both a and b 

d. Panmigration 

Answer- Both a and b

Que- Change in the frequency of alleles at a locus that occurs by chance is 

a. Multation 

b. Selection 

c. Non-random mating 

d. Genetic drift 

Answer- Genetic drift

Que- Which of the following organs serve no apparent purpose 

a. Vestigial organs 

b. Non vestigial organs 

c. Homologous organs 

d. Analogous organs 

Answer- Vestigial organs

Que- Which of the following precesses had resulted in the production of different breeds of domestic dogs and pigeons? 

a. Natural selection 

b. Cross breeding 

c. Artificial selection 

d. Self breeding 

Answer- Artificial selection

Que- Which of the following is not vestigial organ of man? 

a. Appendix 

b. Coccyx 

c. Nictitating membrane 

d. None of these 

Answer- None of these

Que- Concept of evolution was first presented by 

a. Aristotle 

b. Lamarck 

c. Darwin 

d. Wallace 

Answer- Aristotle

Que- If we consider Hardy-Weinberg law, then following is incorrect in its sense 

a. Mutations cause changes in genetic frequency 

b. Migration changes allelic frequency 

c. There should not be selection 

d. Non-random mating will reduce chances of evolution 

Answer- Non-random mating will reduce chances of evolution

Que- Study of relationship of organisms to their environment is 

a. Ecology 

b. Palaentology 

c. Geology 

d. None of these 

Answer- Ecology

Que- All populations within an ecosystem interconnected to one another are known as 

a. Species 

b. Family 

c. Community 

d. Biomes 

Answer- Community

Que- Major regional ecological community of plants and animals forms 

a. Biosphere 

b. Biomass 

c. Biomes 

d. Bioecosystem 

Answer- Biomes

Que- The actual location or place where an organism lives is 

a. Environment 

b. Biosphere 

c. Biomass 

d. Habitat 

Answer- Habitat

Que- The role a species plays in a community including behavior and influence is 

a. Nichon 

b. Niche 

c. Autecology 

d. Profession 

Answer- Niche

Que- Study of a single population's relationship to its environment is called 

a. Ecology 

b. Synecology 

c. Autecology 

d. Niche 

Answer- Autecology

Que- The biosphere covers about 

a. 8-10 km 

b. 5-10 km 

c. 15-30 km 

d. 16-20 km 

Answer- 16-20 km

Que- Abiotic components include 

a. Atmosphere 

b. Hydrosphere 

c. Lithosphere 

d. All of these 

Answer- All of these

Que- Which statement is true? 

a. Producers are heterotrophic organisms 

b. Consumers are autotrophic organisms 

c. Fungi and bacteria are decomposers 

d. Consumers release chemical elements as ions 

Answer- Fungi and bacteria are decomposers

Que- Sequence of changes in community and its non-living environment over a period of time is 

a. Niche 

b. Succession 

c. Alterations 

d. Neo-ecology 

Answer- Succession

Que- Plants growing in xeric conditions are called 

a. Spherophytes 

b. Mesophytes 

c. Xerophytes 

d. Teridophytes 

Answer- Xerophytes

Que- Lichen and algae form 

a. Climax community 

b. Pioneers community 

c. Initiator community 

d. Seral community 

Answer- Pioneers community

Que- Diverse and stable community at the end of succession is 

a. Climax community 

b. Pioneers community 

c. Top community 

d. Stable community 

Answer- Climax community

Que- Secondary succession starts from 

a. A bar rock sand 

b. Clear glacial pool 

c. From remains of previous ecosystem 

d. Fire 

Answer- From remains of previous ecosystem

Que- Hydrosere is 

a. Secondary succession starting in a pond 

b. Primary succession starting in a pond 

c. Primary succession starting on a dry soil 

d. All of these 

Answer- Primary succession starting in a pond

Que- Mosses are 

a. Dermatocarpon 

b. Permellia 

c. Tortula 

d. Both b and c 

Answer- Tortula

Que- Wood forests form the 

a. Pioneers community 

b. Climax community 

c. Top community 

d. Transient community 

Answer- Climax community

Que- Disease in living organisms caused by parasites is called 

a. Parasitism 

b. Infestation 

c. Predation 

d. Infection 

Answer- Infestation

Que- Legume plants are the hosts to 

a. Rhizobium 

b. Mycorrhiza 

c. Lichen 

d. Algae 

Answer- Rhizobium

Que- A dual organism composed of symbiotic association of an alga living within a fungus myceliium is 

a. Mycorrhiza 

b. Rhizobium 

c. Lichen 

d. Legume 

Answer- Lichen

Que- Symbiosis relationship in which only one organism is benefited is 

a. Symbiosis 

b. Commensalism 

c. Mutualism 

d. Unism 

Answer- Commensalism

Que- Sharks may have small fish attached to them called 

a. Rumors 

b. Romas 

c. Romosis 

d. Remoras 

Answer- Remoras

Que- Over grazing leads to 

a. Good pastured lands 

b. Rocky areas 

c. Totally barren lands 

d. Salinity 

Answer- Totally barren lands

Que- Nitrogen constitutes about ______ % of atmosphere 

a. 0.58 

b. 0.25 

c. 0.1 

d. 0.78 

Answer- 0.78

Que- Oxidation of ammonia or ammonium ions by bacteria in soil is called 

a. Nitrification 

b. Ammonification 

c. Assimilation 

d. Denitrification 

Answer- Nitrification

Que- Gross primary production is 

a. Amount of energy fixed by small plants 

b. Amount of energy fixed by large plants 

c. Total amount of energy fixed by all plants 

d. Primary production minus respiratory loss 

Answer- Total amount of energy fixed by all plants

Que- Plant biomass is 

a. Gross primary production 

b. Net primary production 

c. Gross primary production minus respiratory loss 

d. Both b and c 

Answer- Both b and c

Que- Total solar energy trapped by the producers in an ecosystem is 

a. 0.95 

b. 0.2 

c. 0.78 

d. 0.01 

Answer- 0.01

Que- The major unit of ecology is 

a. Population 

b. Community 

c. Ecosystem 

d. Biome 

Answer- Ecosystem

Que- Eco' part of word ecosystem means 

a. Family household 

b. Study of 

c. Collection of related parts that function as a unit 

d. Environment 

Answer- Environment

Que- Which of the following is not true for food web? 

a. Formed from food chain 

b. Complex than food chain 

c. Stable than food chain 

d. Starts with primary consumers 

Answer- Starts with primary consumers

Que- Which one of the following is more tolerant to herbivore 

a. Grasses 

b. Trees 

c. Herbs 

d. None of these 

Answer- Grasses

Que- Which of the following step of nitrogen cycle is not useful for plants 

a. Ammonification 

b. Nitrification 

c. Denitrification 

d. Both a and c 

Answer- Denitrification

Que- Weather refers to 

a. Short-term fluctuations in temperature, cloud cover, wind and precipitation 

b. It prevails over periods of hrs or days 

c. Overall patterns of weather that prevail from year to year 

d. Both a and b 

Answer- Both a and b

Que- Which statement about hydrospheric ecosystem is incorrect? 

a. Salt water ocean and sea are the largest ecosystems on earth 

b. Salt water ecosystem covers about 75% earth surface 

c. Fresh water ecosystem covers less than 1% of earth surface 

d. It temperature is more moderate to support life 

Answer- Salt water ecosystem covers about 75% earth surface

Que- Productivity of an ecosystem is indicated by 

a. Number of plants in that ecosystem 

b. The density of that ecosystem 

c. Consumption of carbon dioxide and evolve of oxygen 

d. Both a and b 

Answer- Both a and b

Que- In which zone plant community is most diverse 

a. Limnetic zone 

b. Littoral zone 

c. Profundal zone 

d. All of these 

Answer- Littoral zone

Que- Which statement about profundal zone is correct? 

a. Plants are unable to anchor but enough light penetrates to support photosynthesis 

b. Phytoplanktons in this region are cyanobacteria 

c. Decomposers and detritus feeders inhabit it 

d. Water lilies are abundant 

Answer- Decomposers and detritus feeders inhabit it

Que- Eutrophication is 

a. Process of decreasing nutrients by human activities 

b. Adequate nutrition accelerated by human activities 

c. Changing the trophic levels of an ecosystem by human activities 

d. Addition of more predators in an ecosystem 

Answer- Adequate nutrition accelerated by human activities

Que- In polluted lake which organisms dominate the community 

a. Fish 

b. Crustaceans 

c. Phytoplanktons 

d. Blue green algae 

Answer- Blue green algae

Que- Evolution of vascular bundles in plants and skeleton in animals is an adaptation for 

a. Hdrospheric ecosystem 

b. Aquatic ecosystem 

c. Terrestrial ecosystem 

d. All of these 

Answer- Terrestrial ecosystem

Que- Development of bark in plants and skin in animals is a method for 

a. Providing support 

b. Protection from enemies 

c. Reducing water loss 

d. Helping in food production 

Answer- Reducing water loss

Que- Which statement is incorrect? 

a. Average rainfall in temperate deciduous forests is 750-1500mm 

b. Temperature of coniferous alpine and boreal forests is upto 10 degrees 

c. Northern coniferous forests are called Taiga 

d. Coniferous forests located at high latitude are alpine 

Answer- Coniferous forests located at high latitude are alpine

Que- Temperature of temperate deciduous forests is 

a. 4-30 degree C 

b. 45-50 degree C 

c. 20-25 degree C 

d. 5-10 degree C 

Answer- 4-30 degree C

Que- Coniferous forests located at high altitude are called 

a. Taiga 

b. Alpine 

c. Boreal 

d. Arctic 

Answer- Alpine

Que- Grass land in tropic climates with woody trees is called 

a. Prairies 

b. Savanna 

c. Boreal 

d. Alpines 

Answer- Savanna

Que- Zone of lake water which is of open water near the surface is 

a. Littoral 

b. Limnetic 

c. Profundal 

d. Benthic 

Answer- Limnetic

Que- Ecosystem of Shogran is 

a. Coniferous alpine 

b. Boreal 

c. Temperate deciduous 

d. Grassland 

Answer- Temperate deciduous

Que- Mountains of Koh Hindukush come under 

a. Tundra 

b. Grass land 

c. Tropical forests 

d. Temperate deciduous 

Answer- Tundra

Que- Annual rainfall in grass land is 

a. 1500-2500 mm 

b. 750-1500 mm 

c. 250-750 mm 

d. 250-500 mm 

Answer- 250-750 mm

Que- One of the most important cause of desertification is 

a. Floods 

b. Wind blowing 

c. Raining 

d. Deforestation 

Answer- Deforestation

Que- End of earth' is related to 

a. Tropical rain forest 

b. Temperate deciduous forest 

c. Savanna 

d. Tundra 

Answer- Tundra

Que- Desert ecosystem of Mianwali is 

a. Thar 

b. Thal 

c. Cholistan 

d. None of these 

Answer- Thal

Que- In sub-humid tropical grassland productivity is more than 

a. 700-1500g/m2 

b. 4000g/m2 

c. 5000g/m2 

d. 6050g/m2 

Answer- 4000g/m2

Que- Annual rainfall in deserts is less than 

a. 150-200 mm 

b. 500-700 mm 

c. 250-500 mm 

d. 700-800mm 

Answer- 250-500 mm

Que- Treeless tundra of high latitude between taiga and polar ice caps is called 

a. Northern tundra 

b. Antarctic tundra 

c. Arctic tundra 

d. Polar tundra 

Answer- Arctic tundra

Que- The most fragile of all biomes is 

a. Grassland 

b. Coniferous alpine 

c. Desert 

d. Tundra 

Answer- Tundra

Que- Which one is a non-renewable resource? 

a. Wild life 

b. Forests 

c. Natural gas 

d. Land 

Answer- Natural gas

Que- Process that supplies food to living things through decaying and decomposition is called 

a. Food cycle 

b. Nutrient cycle 

c. Dead-live cycle 

d. None of these 

Answer- Nutrient cycle

Que- Balance in the nutrient cycle can be upset when 

a. Too much food is consumed 

b. Not enough food is produced 

c. Decayed nutrients are not returned to the ground 

d. All of these 

Answer- All of these

Que- In air nitrogen is 

a. 0.57 

b. 0.2 

c. 0.79 

d. 0.3 

Answer- 0.79

Que- In air % of oxygen and carbon dioxide is 

a. Oxygen 20%, CO2 0.03% 

b. Oxygen 50%, CO2 50% 

c. Oxygen 30%, CO2 0.05% 

d. Oxygen 25%, CO2 0.02% 

Answer- Oxygen 20%, CO2 0.03%

Que- Water constitutes --% of body weight? 

a. 25-30% 

b. 70-90% 

c. 10-30% 

d. 30-50% 

Answer- 70-90%

Que- Which statement is true? 

a. 20% of total water is in the form of frozen ice caps 

b. 80% is in oceans 

c. 1% as fresh water lakes, streams and rivers 

d. 10% is in canals 

Answer- 1% as fresh water lakes, streams and rivers

Que- Total area of the world under cultivation is 

a. 0.05 

b. 0.11 

c. 0.21 

d. 0.31 

Answer- 0.11

Que- Wild life refers to 

a. All plants of the world 

b. All non cultivated plants 

c. Non domesticated animals 

d. Both b and c 

Answer- Both b and c

Que- Endangered species are 

a. Dangerous for the life of humans 

b. Reduced in number 

c. Already extinct 

d. All of these 

Answer- Reduced in number

Que- ______% of our energy requirements are met from fossil fuels 

a. 50.0 

b. 55.0 

c. 90.0 

d. 95.0 

Answer- 95.0

Que- Hydroelectricity is generated by using ______ of falling water. 

a. Potential energy 

b. Gravitational energy 

c. Kinetic energy 

d. All of these 

Answer- Kinetic energy

Que- Driving force for all the cycles in ecosystem is 

a. Water 

b. Soil 

c. Sun 

d. Air 

Answer- Sun

Que- Tides are caused by 

a. Gravitational pull of sun 

b. Movements of large animals in water 

c. Uneven water body floor 

d. High winds 

Answer- Gravitational pull of sun

Que- Wind blows from area of 

a. Low pressure to high pressure 

b. High pressure to low pressure 

c. Moderate pressure to high pressure 

d. Low pressure to low pressure 

Answer- High pressure to low pressure

Que- Geothermal energy is 

a. Energy obtained from nuclear fuel 

b. Energy obtained from burning natural fuels 

c. Heat energy trapped underground 

d. Energy obtained from blowing hot winds 

Answer- Heat energy trapped underground

Que- Hot substance is escaped from inside the earth in the form of 

a. Volcanoes 

b. Hot springs 

c. Geysers 

d. All of these 

Answer- All of these

Que- In oceans of tropical regions 

a. Temperature of surface water is 40?C and 10?C at depth 

b. Temp of surface water is 25?C and 5?C at depth 

c. Surface water 50?C and depth 20?C 

d. Surface water 10?C and depth 15?C 

Answer- Temp of surface water is 25?C and 5?C at depth

Previous Post Next Post