R4RIN – MCQs, Mock Tests | Biology Biology MCQS[NEET-2021 to 2022]-Ecology-II

Carbon dioxide is called green-house gas because it is

1. Transparent to sunlight but traps heat
2. Transparent to heat but traps sunlight
3. Used in green-house to increase plant growth
4. Transparent to both sunlight and heat

✅ Correct Answer: 1

Trichoderma harzianum has proved a useful microorganism for:

1. Reclamation of wastelands
2. Bioremediation of contaminated soils
3. Biological control of soil-borne plant pathogens
4. Gene transfer in higher plants

✅ Correct Answer: 2

The slow rate of decomposition of fallen logs in nature is due to their:

1. Poor nitrogen content
2. Low moisture content
3. Anaerobic environment around them
4. Low cellulose content

✅ Correct Answer: 1

Which one of the following is not a bioindicator of water pollution

1. Blood-worms
2. Sludge-worms
3. Sewage fungus
4. Stone flies

✅ Correct Answer: 4

Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming?

1. CO2 40%,CFCs 30%
2. CFCs 14%, Methane 20%
3. Methane 20%, N2O 18%
4. N2O 6%, CO2 86%

✅ Correct Answer: 2

Which one of the following is not a functional unit of an ecosystem?

1. Productivity
2. Stratification
3. Energy flow
4. Decomposition

✅ Correct Answer: 2

The upright pyramid of number is absent in

1. Graasland
2. Pond
3. Lake
4. Forest

✅ Correct Answer: 4

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

1. Nitrogen cycle
2. Carbon cycle
3. Sulphur cycle
4. Phosphorus cycle

✅ Correct Answer: 4

Identify the possible link "A" in the following food chain: Plant &#8594; insect &#8594; frog &#8594; "A" &#8594; Eagle

1. Parrot
2. Rabbit
3. Cobra
4. Wolf

✅ Correct Answer: 3

The type of ecosystem with the highest mean plant productivity is

1. Tropical rain forest
2. Temperate grassland
3. Desert
4. Tundra

✅ Correct Answer: 1

In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is

1. Zooplankton
2. Phytoplankton
3. Benthos
4. Nekton

✅ Correct Answer: 1

The final stable community in ecological succession is

1. Climax
2. Sere
3. Pioneers
4. Carnivores

✅ Correct Answer: 1

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having

1. High stability and high resilience
2. Low stability and low resilience
3. High stability and low resilience
4. Low stability and high resilience

✅ Correct Answer: 4

Trophic levels in ecosystem is formed by :

1. only herbivores
2. Only bacteria
3. only plants
4. Organisms linked in food chain

✅ Correct Answer: 4

"Complete competitors cannot coexist" is true for

1. Primary succession
2. Secondary succession
3. Competitive exclusion
4. Character displacement

✅ Correct Answer: 3

Bell-shaped polygonal pyramid indicates

1. Low percentage of young individuals
2. Moderate percentage of young individuals
3. High percentage of young individuals
4. Low percentage of old individuals

✅ Correct Answer: 2

The age of pyramid with broad base indicates

1. High percentage of old individuals
2. Low percentage of young individuals
3. High percentage of young individuals
4. Low percentage of old individuals

✅ Correct Answer: 3

Which one of the following ecosystem types has the highest annual net primary productivity?

1. Tropical deciduous forest
2. Tropical rain forest
3. Temperate deciduous forest
4. Temperate evergreen forest

✅ Correct Answer: 2

A renewable exhaustible natural resource is

1. Petroleum
2. Coal
3. Forests
4. Minerals

✅ Correct Answer: 3

Competition is severe in a population that has a distribution which is

1. Uniform
2. Random
3. Non-random
4. Irregular

✅ Correct Answer: 4

In a population, if the rate of addition of new members is higher than the rate of individuals lost, it shows

1. Exponential growth
2. Declined growth
3. Zero population growth
4. none of these

✅ Correct Answer: 1

Which of the followings take part in symbiosis of lichen?

1. Fungus-Fungus
2. Alga-Alga
3. Alga-Fungus
4. Fungus-Gymnosperm

✅ Correct Answer: 3

In an ecosystem Biotic factors affect the survival of an organism in that ecosystem. They include

1. competition for food and water
2. competition for shelter
3. co-operation to help find food
4. All of the above

✅ Correct Answer: 4

Plant succession occurring in a sandy area is

1. Xerosere
2. Halosere
3. Psammosere
4. Hydrosere

✅ Correct Answer: 3

The maximum amount of water that a soil can hold, by capillary action is called

1. Wilting point
2. Water potential
3. Osmotic potential
4. Field capacity

✅ Correct Answer: 4

In ecological succession from pioneer to climax community, the biomass shell

1. No relation
2. Increase and then decrease
3. Decrease
4. Increase continuously

✅ Correct Answer: 4

Individuals of a species which occur in a particular area constitute

1. Fauna
2. Population
3. Flora
4. Flora and Fauna

✅ Correct Answer: 2

The role of an organism in the ecological system is known as

1. Niche
2. Habitat
3. Herbivory
4. Interaction

✅ Correct Answer: 4

Information about birth rate, death rate, sex ratio, age distribution etc. of a population is obtained from

1. Mortality rate
2. Life table
3. Natality table
4. Both (A) and (C)

✅ Correct Answer: 2

Insectivorous plants are adopted to soils

1. Deficient in nitrogenous compounds
2. Deficient in water
3. Rich in water
4. Deficient in trace elements

✅ Correct Answer: 1

Large Woody Vines are more commonly found in

1. Alpine forests
2. Temperate forests
3. Mangroves
4. Tropical rainforests

✅ Correct Answer: 4

Organisms that can tolerate and thrive in a wide range of temperatures are called

1. Eukaryotic organisms
2. Stenothermal
3. Eurythermal
4. None of these

✅ Correct Answer: 3

Pheromones, the chemical messengers produced by certain exocrine glands of skin, affect

1. Skin color
2. Breast
3. Genitalia
4. Mutual behaviour of members of a species

✅ Correct Answer: 4

Lead is one of the most serious environmental pollutants which affects

1. Water
2. Soil
3. Air
4. Noise

✅ Correct Answer: 2

lf there was no CO2 in the atmosphere, the earth temperature would be

1. Less than the present
2. Same as present
3. Higher than the present
4. Dependent on O2 content of air

✅ Correct Answer: 1

Which of the following pollutants is discharged by jet planes?

1. Photo-chemical oxidants
2. Frog
3. Smog
4. Aerosols

✅ Correct Answer: 4

Lichens indicate pollution by

1. Ozone
2. SO2
3. NO3
4. CO

✅ Correct Answer: 2

Which of the environmental pollutions can cause birth defects?

1. Smog
2. SO2
3. CO
4. Radioactivity

✅ Correct Answer: 4

Major aerosol pollutant present in the jet plane emission is

1. Carbon monoxide
2. Carbon tetrachloride
3. Chlorofluorocarbon
4. Sulphur dioxide

✅ Correct Answer: 3

Ultra-violet light causes

1. Photodynamic action
2. Sticky metaphases
3. Formation of pyrimidines
4. Destruction of hydrogen bonds between complementary DNA strands

✅ Correct Answer: 4

The ultraviolet radiations in the stratosphere are absorbed by

1. SO2
2. Oxygen
3. Ozone
4. Argon

✅ Correct Answer: 3

Maximum deposition of DDT will occur in

1. Phytoplankton
2. Crab
3. Eel
4. Sea gull

✅ Correct Answer: 4

Maximum threat to the world is from

1. Global warming
2. Ozone hole
3. Water pollution
4. Soil erosion

✅ Correct Answer: 2

Minamata disease is due to pollution of

1. Industrial waste mercury into fishing water
2. Oil spill in water
3. Organic waste into drinking water
4. Arsenic into the atmosphere

✅ Correct Answer: 1

Montreal Protocol aims at

1. Control of CO2 emission
2. Reduction of ozone depleting substances
3. Biodiversity conservation
4. Control of water pollution

✅ Correct Answer: 2

Most abundant water pollutant is

1. Industrial wastes
2. Pesticides
3. Detergents
4. Ammonia

✅ Correct Answer: 1

Most harmful environmental pollutants are

1. Natural nutrients in excess
2. Human organic wastes
3. Nonbiodegradable chemicals
4. Waste animal feed

✅ Correct Answer: 3

The atmosphere of big metropolitan cities is polluted most by

1. Automobile exhausts
2. Radio-active fall out
3. Household waste
4. Pesticides residue

✅ Correct Answer: 1

Community is

1. Species structure and diversity index of an area
2. Biomass
3. Autotrophic and heterotrophic components
4. All of these

✅ Correct Answer: 4

Which factor of ecosystem includes plants, animals and microorganisms?

1. Biotic factors
2. Direct factors
3. Indirect factors
4. Abiotic factors

✅ Correct Answer: 1