Question 1

Which of the following best describes the role of plants in the movement of matter in ecosystems?

Accepted Answer

Plants take in carbon dioxide from the air and water from the soil to make food and release oxygen.

Answer

Plants take in oxygen from the air and nutrients from animals to grow and reproduce.

Answer

Plants consume organic matter from the soil and convert it into oxygen and carbon dioxide.

Answer

Plants decompose dead matter to recycle it into the soil as nutrients.

Question 2

What role do decomposers play in the movement of matter within an ecosystem?

Accepted Answer

Decomposers break down dead organisms and waste, returning nutrients to the soil.

Answer

Decomposers eat dead animals and plants, but do not return any materials to the environment.

Answer

Decomposers produce oxygen for animals to breathe by breaking down carbon dioxide.

Answer

Decomposers consume living plants to obtain energy, releasing carbon dioxide and water.

Question 3

How do animals contribute to the movement of matter in an ecosystem?

Accepted Answer

Animals eat plants or other animals, and their waste products return nutrients to the soil.

Answer

Animals produce sunlight energy that plants use for photosynthesis.

Answer

Animals absorb water from the air, directly increasing the amount of moisture available for plants.

Answer

Animals convert carbon dioxide directly into oxygen without any by-products.

Question 4

Why is water important in the movement of matter among plants, animals, decomposers, and the environment?

Accepted Answer

Water helps transport nutrients and waste among plants, animals, and decomposers.

Answer

Water acts solely as a habitat for decomposers and does not affect plants or animals.

Answer

Water only provides hydration to animals and has no role in the movement of matter.

Answer

Water cools down the environment, stopping the movement of matter entirely.

Question 5

Which process is primarily responsible for the release of oxygen into the atmosphere by plants?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Decomposition

Answer

Digestion

Question 6

Which type of organism is primarily responsible for breaking down dead plants and animals and returning nutrients to the soil?

Accepted Answer

Decomposers

Answer

Producers

Answer

Herbivores

Answer

Carnivores

Question 7

Which statement best describes how energy from the sun is used in ecosystems?

Accepted Answer

Plants use sunlight to produce food through photosynthesis, which provides energy to the ecosystem.

Answer

Animals use sunlight to warm their bodies, which directly increases their energy levels.

Answer

All parts of the ecosystem absorb sunlight equally, converting it directly into chemical energy.

Answer

Sunlight breaks down dead matter on its own, releasing energy and nutrients back into the soil.

Question 8

What happens to the carbon dioxide in the air when plants perform photosynthesis?

Accepted Answer

It is absorbed by plants and used to make glucose.

Answer

It is converted directly into oxygen for animals to breathe.

Answer

It increases in concentration, contributing to the greenhouse effect.

Answer

It is expelled into space, reducing global warming.

Question 9

What is the role of animals in the carbon cycle within an ecosystem?

Accepted Answer

Animals release carbon dioxide into the atmosphere through respiration.

Answer

Animals absorb carbon dioxide directly from the atmosphere to build their skeletons.

Answer

Animals produce oxygen and reduce carbon dioxide through photosynthesis.

Answer

Animals convert sunlight into carbon dioxide as a form of energy.

Question 10

Which organism primarily helps to recycle nutrients back into the soil after a plant dies?

Accepted Answer

Decomposers

Answer

Herbivores

Answer

Producers

Answer

Carnivores

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