Question 1

Which of the following best describes how matter moves through plants and animals in an ecosystem?

Accepted Answer

Matter is recycled as plants take in carbon dioxide and animals release it.

Answer

Matter flows in one direction from plants to animals only.

Answer

Matter is stored in the soil and never released.

Answer

Matter is created by plants and destroyed by animals.

Question 2

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

Accepted Answer

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

Answer

Decomposers store energy in their bodies for later use by plants and animals.

Answer

Decomposers prevent the recycling of matter by consuming nutrients.

Answer

Decomposers capture sunlight to produce energy directly.

Question 3

How do plants contribute to the cycle of matter in an ecosystem?

Accepted Answer

Plants convert sunlight into chemical energy and release oxygen as a byproduct.

Answer

Plants absorb oxygen from the air and release carbon dioxide continuously.

Answer

Plants break down waste material to clean the environment.

Answer

Plants consume animals to acquire energy and nutrients.

Question 4

In what way do animals affect the movement of matter in an ecosystem?

Accepted Answer

Animals consume plants or other animals, transferring energy and matter through the food chain.

Answer

Animals produce non-recyclable waste that accumulates in the environment.

Answer

Animals decompose organic matter, returning minerals to the air.

Answer

Animals create energy from sunlight to fuel the ecosystem.

Question 5

Why are decomposers essential for the sustainability of an ecosystem?

Accepted Answer

Decomposers break down waste and dead organisms, releasing nutrients back into the soil.

Answer

Decomposers transform sunlight into nutrients for plant use.

Answer

Decomposers provide energy directly to plants through photosynthesis.

Answer

Decomposers prevent plants from consuming too much oxygen.

Question 6

What process allows plants to obtain the matter necessary for growth from the environment?

Accepted Answer

Photosynthesis enables plants to convert carbon dioxide and water into glucose and oxygen.

Answer

Respiration allows plants to take in nitrogen and release oxygen.

Answer

Evaporation helps plants absorb sunlight and convert it into energy.

Answer

Decomposition lets plants convert minerals directly into food.

Question 7

How does matter move from plants to animals in an ecosystem?

Accepted Answer

Animals eat plants, transferring nutrients and energy into their bodies.

Answer

Matter moves from plants to animals through osmosis in the soil.

Answer

Animals absorb nutrients from the air released by plants.

Answer

Plants directly transfer energy to animals through sunlight exposure.

Question 8

Which of the following best explains the role of decomposers in nutrient cycling?

Accepted Answer

Decomposers break down organic material, releasing nutrients back into the environment.

Answer

Decomposers produce energy directly from sunlight to fuel the ecosystem.

Answer

Decomposers store nutrients in their bodies for future use by other organisms.

Answer

Decomposers convert minerals into energy for animals.

Question 9

In an ecosystem, what happens to carbon atoms when a plant is eaten by an animal?

Accepted Answer

The carbon atoms transfer to the animal's body, providing energy and forming new tissues.

Answer

The carbon atoms escape into the atmosphere, reducing the plant's mass.

Answer

The carbon atoms become non-recyclable waste within the animal.

Answer

The carbon atoms are used to produce minerals in the soil.

Question 10

How does the process of photosynthesis contribute to the carbon cycle in an ecosystem?

Accepted Answer

Photosynthesis captures carbon dioxide from the air and fixes it into glucose in plants.

Answer

Photosynthesis converts soil nutrients directly into carbon dioxide for plant use.

Answer

Photosynthesis removes oxygen from the atmosphere and stores it in plant roots.

Answer

Photosynthesis releases carbon dioxide into the air as plants create energy.

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