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Ecosystem Dynamics and Environmental Changes Quiz

#1

Which organism is responsible for the majority of oxygen production on Earth?

Trees
Explanation

Photosynthesis by trees releases oxygen.

#2

What is the primary source of energy for most ecosystems?

Sunlight
Explanation

Sunlight fuels photosynthesis, the basis of most ecosystems.

#3

What is the term for the process by which plants lose water vapor to the atmosphere?

Transpiration
Explanation

Transpiration is the release of water vapor through plant leaves.

#4

Which of the following is a primary consumer in a food chain?

Herbivore
Explanation

Herbivores feed directly on producers in a food chain.

#5

Which of the following is NOT a primary factor influencing population growth?

Climate change
Explanation

Climate change is a broader environmental phenomenon, not directly tied to population growth.

#6

What is the term for the total mass of living organisms in a given area?

Biomass
Explanation

Biomass represents the collective mass of living organisms in an area.

#7

Which of the following is NOT a greenhouse gas?

Nitrogen
Explanation

Nitrogen is not a greenhouse gas; it's the most abundant gas in the atmosphere.

#8

What is an example of a pioneer species in ecological succession?

Lichen
Explanation

Lichen is among the first organisms to colonize barren environments.

#9

What is the process by which nitrogen from the atmosphere is converted into a form usable by plants?

Nitrogen fixation
Explanation

Nitrogen fixation converts atmospheric nitrogen into a form that plants can utilize.

#10

Which of the following is NOT a component of soil?

Sunlight
Explanation

Sunlight is not a component of soil; it's an external factor affecting soil.

#11

Which of the following is an example of a density-independent factor affecting population growth?

Natural disasters
Explanation

Natural disasters affect populations regardless of their density or size.

#12

What is the term for the process by which one community replaces another over time?

Ecological succession
Explanation

Ecological succession is the gradual replacement of one community by another.

#13

Which of the following is an example of mutualism?

Bee pollinating a flower
Explanation

Bees benefit from nectar while aiding in pollination, benefiting the flower.

#14

What is the term for the variety of different species in an ecosystem?

Biodiversity
Explanation

Biodiversity refers to the richness of species in an ecosystem.

#15

Which of the following is an example of a keystone species?

Wolf
Explanation

Wolves, as top predators, exert significant influence on ecosystem structure and function.

#16

Which of the following is a major greenhouse gas?

Carbon dioxide
Explanation

Carbon dioxide is a significant greenhouse gas contributing to global warming.

#17

What is the term for the process by which two or more species evolve in response to changes in each other?

Co-evolution
Explanation

Co-evolution is the reciprocal evolutionary changes between two or more interacting species.

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