Ecology MCQs with Answers

Ecology MCQs are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important Ecology MCQs for Preparation.

The student can clear their concepts for Ecology online quiz by attempting it. Doing MCQs based Ecology will help you to check your understanding and identify areas of improvement.

Ecology Online MCQs with Answers

Which of the following terms refers to the study of the relationships between organisms and their environment?
a) Ecology
b) Biology
c) Zoology
d) Botany

Answer
a) Ecology

The term “ecosystem” refers to:
a) A community of organisms
b) The physical environment
c) The study of plants
d) A community of organisms and their physical environment

Answer
d) A community of organisms and their physical environment

Which of the following is an abiotic factor in an ecosystem?
a) Plants
b) Animals
c) Sunlight
d) Decomposers

Answer
c) Sunlight

The role an organism plays in its ecosystem is called its:
a) Habitat
b) Niche
c) Territory
d) Population

Answer
b) Niche

Which of the following is an example of a biotic factor in an ecosystem?
a) Temperature
b) Rainfall
c) Soil pH
d) Predation

Answer
d) Predation

The level of organization in ecology, from smallest to largest, is:
a) Organism, population, community, ecosystem
b) Organism, community, population, ecosystem
c) Organism, population, ecosystem, community
d) Community, population, organism, ecosystem

Answer
a) Organism, population, community, ecosystem

The study of the relationships between different species in a community is called:
a) Population ecology
b) Community ecology
c) Ecosystem ecology
d) Behavioral ecology

Answer
b) Community ecology

Which of the following is an example of a decomposer in an ecosystem?
a) Lion
b) Grasshopper
c) Mushroom
d) Tree

Answer
c) Mushroom

The process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen is called:
a) Respiration
b) Photosynthesis
c) Decomposition
d) Fermentation

Answer
b) Photosynthesis

The movement of individuals into a population is called:
a) Immigration
b) Emigration
c) Migration
d) Dispersion

Answer
a) Immigration

Which of the following is an example of a primary consumer in a food chain?
a) Herbivore
b) Carnivore
c) Omnivore
d) Decomposer

Answer
a) Herbivore

The process by which energy is transferred between trophic levels in an ecosystem is called:
a) Biomagnification
b) Bioaccumulation
c) Energy flow
d) Nutrient cycling

Answer
c) Energy flow

The process by which nutrients are returned to the environment from dead organisms and waste materials is called:
a) Respiration
b) Photosynthesis
c) Decomposition
d) Digestion

Answer
c) Decomposition

Which of the following is an example of a mutualistic relationship?
a) Predation
b) Competition
c) Commensalism
d) Pollination

Answer
d) Pollination

The total amount of living matter in a given area is called:
a) Biodiversity
b) Biomass
c) Population density
d) Community size

Answer
b) Biomass

The study of the movement of energy and nutrients through ecosystems is called:
a) Population ecology
b) Community ecology
c) Ecosystem ecology
d) Landscape ecology

Answer
c) Ecosystem ecology

Which of the following is an example of a keystone species?
a) Deer
b) Mouse
c) Otter
d) Squirrel

Answer
c) Otter

The process by which water changes from a liquid to a gas is called:
a) Condensation
b) Precipitation
c) Evaporation
d) Transpiration

Answer
c) Evaporation

The process by which water changes from a gas to a liquid is called:
a) Condensation
b) Precipitation
c) Evaporation
d) Transpiration

Answer
a) Condensation

The process by which water falls from the atmosphere to the Earth’s surface is called:
a) Condensation
b) Precipitation
c) Evaporation
d) Transpiration

Answer
b) Precipitation

Which of the following is a non-renewable resource?
a) Solar energy
b) Wind energy
c) Fossil fuels
d) Geothermal energy

Answer
c) Fossil fuels

The process by which nitrogen gas in the atmosphere is converted into a usable form by bacteria is called:
a) Nitrogen fixation
b) Nitrification
c) Denitrification
d) Ammonification

Answer
a) Nitrogen fixation

Which of the following is an example of a primary succession?
a) A forest recovering after a fire
b) A pond filling with sediment over time
c) A field transitioning to a forest over several decades
d) A grassland undergoing seasonal changes

Answer
a) A forest recovering after a fire

The process by which individuals with advantageous traits are more likely to survive and reproduce is called:
a) Evolution
b) Natural selection
c) Genetic drift
d) Speciation

Answer
b) Natural selection

Which of the following is an example of a renewable resource?
a) Oil
b) Natural gas
c) Solar energy
d) Coal

Answer
c) Solar energy

The study of the relationships between organisms and their physical environment is called:
a) Population ecology
b) Community ecology
c) Ecosystem ecology
d) Behavioral ecology

Answer
c) Ecosystem ecology

Which of the following is an example of a secondary consumer in a food chain?
a) Rabbit
b) Grasshopper
c) Snake
d) Deer

Answer
c) Snake

The process by which a population becomes better suited to its environment over time is called:
a) Evolution
b) Genetic drift
c) Adaptation
d) Speciation

Answer
c) Adaptation

The study of the interactions between different species in a community is called:
a) Population ecology
b) Community ecology
c) Ecosystem ecology
d) Behavioral ecology

Answer
b) Community ecology

Which of the following is an example of a pioneer species?
a) Grass
b) Tree
c) Shrub
d) Flower

Answer
a) Grass

The movement of individuals out of a population is called:
a) Immigration
b) Emigration
c) Migration
d) Dispersion

Answer
b) Emigration

The maximum number of individuals of a species that an ecosystem can support is called its:
a) Carrying capacity
b) Population size
c) Community size
d) Ecosystem capacity

Answer
a) Carrying capacity

The study of the movement of energy and nutrients through ecosystems is called:
a) Population ecology
b) Community ecology
c) Ecosystem ecology
d) Landscape ecology

Answer
c) Ecosystem ecology

Which of the following is an example of an invasive species?
a) Native grass
b) Endangered bird
c) Introduced snake
d) Native flower

Answer
c) Introduced snake

The process by which nitrogen gas in the atmosphere is converted into a usable form by bacteria is called:
a) Nitrogen fixation
b) Nitrification
c) Denitrification
d) Ammonification

Answer
a) Nitrogen fixation

Which of the following is an example of a climax community?
a) A grassland
b) A forest
c) A pond
d) A desert

Answer
b) A forest

The study of the interactions between organisms and their physical environment is called:
a) Population ecology
b) Community ecology
c) Ecosystem ecology
d) Behavioral ecology

Answer
c) Ecosystem ecology

Which of the following is an example of a producer in a food chain?
a) Herbivore
b) Carnivore
c) Omnivore
d) Autotroph

Answer
d) Autotroph

The process by which a new species evolves from an existing species is called:
a) Speciation
b) Hybridization
c) Adaptation
d) Genetic drift

Answer
a) Speciation

Which of the following is an example of a climat

 

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