R4RIN – MCQs, Mock Tests | Biology Biology MCQS[NEET-2021 to 2022]-Ecology mcq for competitive exams

Which one of the following types organisms occupy more than one trophic level in a ecosystem

1. Phytoplankton
2. Frog
3. Zooplankton
4. Fish

✅ Correct Answer: 4

Afforestation should be with .

1. Exotic species
2. Indigenous species
3. Bamboos
4. Eucalyptus

✅ Correct Answer: 2

Renewable exhaustible natural resource of energy is

1. Biomass/Forest
2. Petroleum
3. Coal
4. Kerosene

✅ Correct Answer: 1

Which can be tropic level of a lion in from ecosystem?

1. T3
2. T2
3. T4
4. T1

✅ Correct Answer: 3

Wildlife is destroyed most when

1. There is lack of proper care
2. Mass scale hunting for foreign trade
3. Its natural habitat is destroyed
4. Natural calamity

✅ Correct Answer: 3

Maximum human population can be supported if all the humans are

1. Carnivores
2. Pure vegetarian
3. Vegetarian along with use of milk
4. Vegetarian alongwith use of milk and eggs

✅ Correct Answer: 3

Dominant plants of cold desert are

1. Tall trees and herbaceous plants
2. Low stature shrubs and herbaceous plants
3. Shrubs and small trees
4. Low stature shrubs and perennial grasses

✅ Correct Answer: 2

If all the plants are to die, all the animals will also die due to deficiency of

1. Food
2. Carbon dioxide
3. Timber
4. Oxygen

✅ Correct Answer: 1

Each successive trophic level has

1. Less total energy
2. More total energy
3. Increased total energy
4. Non- estimated energy contents

✅ Correct Answer: 1

Sunderbans contain mainly

1. Alpine trees
2. Mangrove plants
3. Grass
4. Fir forest

✅ Correct Answer: 2

It is not a protected forest

1. Reserve forest
2. Sanctuary
3. Core of biosphere
4. Orchard

✅ Correct Answer: 4

In grassland ecosystem, the number of primary producers is about 6 million. The number of top carnivore supported by it would be

1. 60
2. 30
3. 6
4. 3

✅ Correct Answer: 4

Energy transfer from organisms to organism in a natural community develops

1. Biological control
2. Food chain
3. Natural barriers
4. Food web

✅ Correct Answer: 2

Biomass produced by plants in oceans accounts for

1. 85%
2. 75%
3. 65%
4. 55%

✅ Correct Answer: 1

Phytoplankton are dominant in

1. Benthic zone
2. Littoral zone
3. Profundal zone
4. Limnetic zone

✅ Correct Answer: 4

Antimalarial drug quinine is got from

1. Root of Cycas
2. Bark of Cinchona
3. Stem of Mango
4. None

✅ Correct Answer: 2

Forest which is never leafless

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

✅ Correct Answer: 3

An organisms contains carbon molecules which have passed through three levels of ecosystem, the organisms is

1. Priamry consumer
2. Predator
3. Tertiary consumer
4. Producer

✅ Correct Answer: 2

Ecological efficiency is

1. Food primary assimilated/food energy ingested 100
2. Gross primary productivity/ incident total solar radiation 100
3. Volume of CO2 evolved/volume of O2 consumed
4. Energy in biomass production at a trophic level/energy in biomass productio

✅ Correct Answer: 4

Land mass occupied by forest is about

1. 11%
2. 22%
3. 30%
4. 60%

✅ Correct Answer: 3

In nitrification ammonia is first oxidized to nitrite by

1. Nitrosomonas and nitrosococcus
2. Nitrosomonas and nitrobacter
3. Pseudomonas and nitrosococus
4. Pseudomonas and thiobacillus

✅ Correct Answer: 1

energy flow in ecosystem is...

1. bidirectional
2. multidirectional
3. unidirectional
4. all around

✅ Correct Answer: 3

which one of the following is one of the characteristic of a biological community?

1. sex-ratio
2. stratification
3. natality
4. mortality

✅ Correct Answer: 2

which of the following is an example of man made ecosystem?

1. tissue culture
2. aquarium
3. herbarium
4. forest

✅ Correct Answer: 2

These belong to the category of primary consumers

1. snakes and frog
2. insects and cattle
3. eagle and snakes
4. water insects

✅ Correct Answer: 2

which one of the following pairs in mismatched?

1. tundra-permafrost
2. coniferous forest- evergreen trees
3. savanna - acacia trees
4. prairie - epiphytes

✅ Correct Answer: 4

which is the reason for highest biomaas in aquatic ecosystem?

1. benthonic and brown algae
2. sea grass, and slime molds
3. nanoplankton, blue green algae, green algae
4. diatoms

✅ Correct Answer: 1

identify the correct type of food chain: dead animal=blow fly maggots= common frog= snake

1. decomposer food chain
2. detrital food chain
3. grazing food chain
4. predator food chain

✅ Correct Answer: 2

which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?

1. prosopis,tree,scrub
2. saccharum,grass,forest
3. shorea robusta, herb, tropical rain forest
4. none of these

✅ Correct Answer: 1

Littoral zone is located along the

1. High mountains
2. Sea
3. River
4. Desert

✅ Correct Answer: 2

Which one of the following correctly represents an organism and its ecological niche?

1. Vallisneria and pond
2. Desert locust (Schistocerca) and desert.
3. Vultures and dense forest
4. Plant lice (aphids) and leaf

✅ Correct Answer: 4

In a lake, phytoplankton grow in abundance in

1. Littoral zone
2. Limnetic zone
3. Profundal zone
4. Benthic region

✅ Correct Answer: 2

Actively moving organism in aquatic ecosystem

1. Phytoplankton
2. Benthos
3. Nekton
4. Zoo plankton

✅ Correct Answer: 3

Which of the following is primary consumer?

1. Producer
2. Carnivore
3. Top carnivore
4. Herbivore

✅ Correct Answer: 4

Deserts, grasslands, forests and tundra are the examples of

1. Biomes
2. Biogeographical regions
3. Ecosystems
4. Biospheres

✅ Correct Answer: 1

Which one of the following is commonly found in temperate coniferous forest?

1. Quercus
2. Dipterocarpus
3. Shorea robusta
4. Pinus wallichiana

✅ Correct Answer: 4

Plant species having a wide range of genetical distribution evolve into a local population known as

1. Biome
2. Ecotype
3. Population
4. Ecosystem

✅ Correct Answer: 2

Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

1. Tertiary production
2. Gross production (GP)
3. Net production (NP)
4. Secondary production

✅ Correct Answer: 2

Niche is defined as the

1. Position of species in a community in relation to other species
2. Place where organism lives
3. Place where organism lives and performs its duty
4. Place where population perform their duties

✅ Correct Answer: 3

The rate of formation of new organic matter by rabbit in a grassland, is called

1. Net productivity
2. Secondary productivity
3. Net primary productivity
4. Gross primary productivity

✅ Correct Answer: 2

The correct sequence of plants in a hydrosere is

1. Oak &#8594; Lantana &#8594; Volvox &#8594; Hydrilla &#8594; Pistia &#8594;
2. Oak &#8594; Lantana &#8594; Scirpus &#8594; Pistia &#8594; Hydrilla &#8594;
3. Volvox &#8594; Hydrilla &#8594; Pistia &#8594; Scirpus &#8594; Lantana &#85
4. Pistia &#8594; Volvox &#8594; Scirpus &#8594; Hydrilla &#8594; Oak &#8594;

✅ Correct Answer: 3

Which one of the following is a wrong statement?

1. Greenhouse effect is a natural phenomenon
2. Eutrophication is a natural phenomenon in freshwater bodies
3. Most of the forests have been lost in tropical areas
4. Ozone in upper part of atmosphere is harmful to animals

✅ Correct Answer: 4

In an area where DDT had been used extensively, the population of birds declined significantly because

1. Cobras were feeding exclusively on birds
2. Many of the birds eggs laid, did not hatch
3. Birds stopped laying eggs
4. Earthworms in the area got eradicated

✅ Correct Answer: 2

dB is a standard abbreviation used for the quantitative expression of

1. The density of bacteria in a medium
2. The dominant Bacillus in a culture
3. A certain pesticide
4. A particular pollutant

✅ Correct Answer: 4

Identify the correctly matched pair

1. Basal Convention - Biodiversity Conservation
2. Montreal Protocol - Global warming
3. Kyoto protocol - Climatic change
4. Ramsar Convention - Ground water pollution

✅ Correct Answer: 3

Common indicator organism of water pollution is:

1. Entamoeba histolytica
2. Escherichia coli
3. Eichhornia crassipes
4. Lemna paucicostata

✅ Correct Answer: 2

Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of :

1. Calmodulin
2. Mg ATPase
3. Ca ATPase
4. None of these

✅ Correct Answer: 1

Lichens can be used as :

1. Source of wood
2. Initial vegetation for waste lands
3. Bio-indicator for water and air pollution
4. To check the air pollution

✅ Correct Answer: 3

Industrial melanism is an example of

1. Protective resemblance with the surrounding
2. Drug resistance
3. Defensive adaptation of skin against UV radiations
4. Darkening of skin due to industries

✅ Correct Answer: 1