Energy Transfer in Ecosystems Quiz Review

Which of the following is an example of a producer in a food chain?

• Mineral

• Water

• Animal

• Plant

Answer explanation

In a food chain, producers are organisms that create their own food through photosynthesis. Plants are the primary producers, converting sunlight into energy, while minerals and water are non-living components, and animals are consumers.

Tags

NGSS.MS-LS2-3

What is the primary source of energy for photosynthesis?

• Water

• Carbon dioxide

• Chlorophyll

• Sunlight

Answer explanation

The primary source of energy for photosynthesis is sunlight. Plants use sunlight to convert water and carbon dioxide into glucose and oxygen, making sunlight essential for this process.

Tags

NGSS.MS-LS1-6

Which of the following is an example of a decomposer in an ecosystem?

• Plant

• Herbivore

• Fungus

• Predator

Answer explanation

Fungi are decomposers that break down dead organic matter, returning nutrients to the soil. Unlike plants (producers), herbivores (consumers), and predators (top consumers), fungi play a crucial role in nutrient cycling.

Which of the following best describes chemosynthesis?

• using the energy of the sun to produce glucose

• using the energy stored in the chemical bonds to produce glucose

Answer explanation

Chemosynthesis involves using energy stored in chemical bonds, typically from inorganic compounds, to produce glucose. This distinguishes it from photosynthesis, which relies on solar energy.

What is the main factor that limits the length of a food chain?

• Energy transfer efficiency

• Biodiversity

• Predator-prey relationships

• Climate change

Answer explanation

The main factor limiting the length of a food chain is energy transfer efficiency. Only a small percentage of energy is passed from one trophic level to the next, restricting the number of levels that can be sustained.

Tags

NGSS.MS-LS2-3

What is the other term for autotrophs?

• Producer

• Consumer

• Decomposer

• Detrivore

Answer explanation

Autotrophs are organisms that produce their own food through photosynthesis or chemosynthesis. They are commonly referred to as 'producers' because they create energy-rich compounds that serve as food for other organisms.

Organisms that cannot make their own food and must obtain energy from external sources are called

• autotrophs

• heterotrophs

• thylakoids

• plants

Answer explanation

Organisms that cannot produce their own food and rely on external sources for energy are known as heterotrophs. In contrast, autotrophs can make their own food, while thylakoids are structures in chloroplasts, and plants can be autotrophs.

An ecosystem is a community of organisms interacting with their physical environment. Why

are decomposers an important part of ecosystems?

• A. They break down dead organisms to return nutrients to the soil.

• B. They produce their own food for survival.

• C. They play a role in preventing weathering and erosion.

• D. They provide most of the energy to consumers.

Answer explanation

Decomposers are crucial as they break down dead organisms, returning essential nutrients to the soil, which supports plant growth and maintains ecosystem health. This process is vital for nutrient cycling.

Tags

NGSS.MS-LS2-3

Which type of organism is the snake?

• Producer

• Primary Consumer

• Secondary Consumer

• Producer

Answer explanation

The snake is classified as a secondary consumer because it primarily feeds on primary consumers, such as rodents. It does not produce its own food like producers (plants) nor does it primarily consume producers.

Why are decomposers important in an ecosystem?

• They can cause sickness

• Producers can eat them

• They break down dead organisms into simpler materials

• They take things out of the soil

Answer explanation

Decomposers are crucial in ecosystems because they break down dead organisms into simpler materials, recycling nutrients back into the soil, which supports plant growth and maintains ecological balance.

Tags

NGSS.MS-LS2-3