Ecology Unit 4 Ecosystems Practice Quiz

What is the process by which carbon is cycled through the atmosphere, biosphere, geosphere, and hydrosphere?

• Nitrogen cycle

• Water cycle

• Oxygen cycle

• Carbon cycle

Answer explanation

The process by which carbon is cycled through the atmosphere, biosphere, geosphere, and hydrosphere is called the Carbon cycle. It involves the exchange of carbon between living organisms, the atmosphere, and the Earth's crust.

Which of the following is not a biogeochemical cycle: carbon cycle, nitrogen cycle, or photosynthesis cycle?

• water cycle

• photosynthesis cycle

• oxygen cycle

• respiration cycle

Answer explanation

The photosynthesis cycle is not a biogeochemical cycle. It is a process by which plants convert sunlight into energy and release oxygen.

What is the ultimate source of energy for most ecosystems?

• nuclear power

• sun

• wind

• fossil fuels

Answer explanation

The sun is the ultimate source of energy for most ecosystems.

What are the three main types of ecological pyramids?

• Food pyramid, water pyramid, and air pyramid

• Energy pyramid, biomass pyramid, and pyramid of numbers

• Herbivore pyramid, carnivore pyramid, and omnivore pyramid

• Triangle pyramid, square pyramid, and rectangular pyramid

Answer explanation

The three main types of ecological pyramids are energy pyramid, biomass pyramid, and pyramid of numbers. These pyramids represent the flow of energy, biomass, and number of organisms in an ecosystem.

What are the primary producers in a food web?

• Plants and algae

• Animals and fungi

• Rocks and minerals

• Bacteria and viruses

Answer explanation

The primary producers in a food web are plants and algae. They convert sunlight into energy through photosynthesis, making them the foundation of the food chain.

What is the role of decomposers in an ecosystem?

• They hunt and consume other organisms for energy

• They break down dead organisms and organic matter, releasing nutrients back into the ecosystem.

• They provide structural support to the ecosystem

• They regulate the temperature of the ecosystem

Answer explanation

Decomposers play a vital role by breaking down dead organisms and organic matter, releasing nutrients back into the ecosystem.

How does atmospheric circulation affect global climate patterns?

• Atmospheric circulation redistributes heat and moisture around the globe, influencing climate patterns.

• Global climate patterns are solely determined by ocean currents, not atmospheric circulation

• Atmospheric circulation has no impact on global climate patterns

• Atmospheric circulation only affects local weather, not global climate

Answer explanation

Atmospheric circulation redistributes heat and moisture, influencing global climate patterns.

What are some examples of ecosystem services provided by natural ecosystems?

• Plastic pollution

• Some examples of ecosystem services provided by natural ecosystems include air and water purification, pollination, climate regulation, and nutrient cycling.

• Building construction

• Oil drilling

Answer explanation

Natural ecosystems provide ecosystem services such as air and water purification, pollination, climate regulation, and nutrient cycling.

What is the relationship between biodiversity and ecosystem stability?

• Biodiversity has no impact on ecosystem stability.

• Biodiversity contributes to the stability of ecosystems.

• Ecosystem stability decreases with increasing biodiversity.

• Ecosystem stability is unrelated to the level of biodiversity.

Answer explanation

Biodiversity contributes to ecosystem stability.

How do human activities impact food webs and ecosystem dynamics?

• They have no impact on food webs and ecosystem dynamics.

• They can improve food webs and ecosystem dynamics.

• They can disrupt food webs and ecosystem dynamics.

• They only impact food webs but not ecosystem dynamics.

Answer explanation

Human activities can disrupt food webs and ecosystem dynamics.