1- The natural residence of every organism is known as:?
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Biome
Niche
Habitat
Habit
2- A mutual relationship between two organisms, where both of them are benefitting from watching the other is called:?
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Mutualism
Symbiosis
Parasitism
Food chain
3- The term ecosystem was proposed by ____ .?
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Lindeman
AG Tansley
Grinnel
Turesson
4- What percentage of oxygen and carbon dioxide exists in the ecosystem??
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20.95% and 0.04%
20.95% and 0.004%
20.0% and 0.40%
20.0% and 0.44%
5- _ is a group of species exploits the biotic and abiotic resources in the same way.?
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Guild
Community
Ecads
Biomes
6- Which is/are the abiotic components of an ecosystem??
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Soil
Protein
Carbon
All of the above
7- Acid rain is a result of:?
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Excess amount of SO2 and NO2
Excess carbon monoxide
Excess amount of NH3
Excess amount CO2
8- The most polluted city in the world is?
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Tokyo
New York
Calcutta
Mexico
9- In a food-chain, the saprophytic organisms are?
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producers
consumers
predators
decomposers
10- Which is the renewable exhaustible natural energy resource??
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Coal
Petroleum
Kerosene
Biomass
11- The process of vernalization is practised in?
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Cold countries
Hot countries
Only in sub-tropical countries
Only in tropical countries
12- Which of the following requires maximum energy??
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Secondary consumer
Decomposer
Primary consumer
Primary producer
13- The bottom area where production is less than respiration in a pond ecosystem is termed as?
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Profundal zone
Tidal zone
Benthic zone
Limnetic zone
14- In an ecosystem, the energy flow is always?
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Always unidirectional
Always bidirectional
In any direction
Always down directional
15- Select a non-denitrifying bacteria?
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Bacillus ramosus
Pseudomonas aeruginosa
Thiobacillus
Thiobacillus denitrificans
16- All species of Lemur are endemic to which area??
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Madagascar
Seychelles Island
Galapagos Island
New Caledonia
17- What type of food chain is it? dead animals → blowfly maggot → maggots → frog → snake?
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Detrital food chain
Decomposer food chain
Predator food chain
Grazing food chain
18- Identify the mismatched pair?
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Prairie – Epiphytes
Tundra – Permafrost
Savanna – Acacia trees
Coniferous forest – Evergreen trees
19- dB is the abbreviation used for the quantitative expression of?
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A Particular Pollutant
The density of bacteria in a medium
Dominant Bacillus in a culture
A pesticide
20- A lake which is rich in nutrients is called?
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Euphotic
Eutrophic
Aphotic
Oligotrophic
21- The force that initiates evolution is __?
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Variation
Mutation
Extinction
Adaptation
22- _ is a vestigial organ?
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Intestinal villi
Papillae
Vermiform appendix
None of the above
23- The earliest geological time period among the following is _?
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Cambrian
Permian
Jurassic
Quaternary
24- Example of a homologous organ?
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The arm of a human, wing of a bird
Wing of an insect, wing of a bird
Leg of a dog, leg of a spider
None of the above
25- Which condition can be explained by Lamarckism??
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How giraffes got their long neck
How humans lost their tail
How humans became bipedal
All of the above
