Eco Systems Quiz

What is the primary source of energy for most ecosystems?

• Geothermal heat

• The Sun

• Decomposition

• Wind

Answer explanation

The Sun is the primary source of energy for most ecosystems as it provides light for photosynthesis, which is the basis of the food chain.

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NGSS.MS-LS2-3

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Which of the following best describes the role of producers in an ecosystem?

• They consume other organisms for energy.

• They decompose dead organisms and recycle nutrients.

• They convert solar energy into chemical energy through photosynthesis.

• They are the primary consumers and feed on plants.

Answer explanation

Producers in an ecosystem convert solar energy into chemical energy through photosynthesis, making them essential for energy flow in the ecosystem.

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NGSS.MS-LS1-6

In a food chain, which trophic level is directly above primary consumers?

• Primary producers

• Secondary consumers

• Tertiary consumers

• Decomposers

Answer explanation

In a food chain, secondary consumers are directly above primary consumers as they feed on them. They are one trophic level higher in the food chain.

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NGSS.MS-LS2-3

What type of symbiotic relationship benefits one organism without harming the other?

• Mutualism

• Commensalism

• Parasitism

• Predation

Answer explanation

Commensalism is the type of symbiotic relationship that benefits one organism without harming the other. In this relationship, one organism benefits while the other is neither helped nor harmed.

What does the carrying capacity of an ecosystem refer to?

• The maximum population size of the species that the environment can sustain indefinitely

• The total biomass that an ecosystem can support

• The number of different species that an ecosystem can support

• The rate at which producers can produce organic material

Answer explanation

The carrying capacity of an ecosystem refers to the maximum population size of the species that the environment can sustain indefinitely.

Which human activity has the most direct impact on the carbon cycle and contributes to global warming?

• Deforestation

• Urbanization

• Burning fossil fuels

• Overfishing

Answer explanation

Burning fossil fuels has the most direct impact on the carbon cycle and contributes to global warming by releasing large amounts of carbon dioxide into the atmosphere.

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In a predator-prey relationship, what typically happens to the predator population when the prey population decreases?

• It increases significantly.

• It decreases, following the prey population trend.

• It remains stable regardless of the prey population.

• It switches to a different prey.

Answer explanation

In a predator-prey relationship, the predator population typically decreases following the prey population trend as they rely on the prey for sustenance.

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Which of the following is an example of a mutualistic relationship?

• A tapeworm living in the intestine of a mammal

• A bee pollinating a flower while collecting nectar

• A lion eating a zebra

• A bird eating ticks off a buffalo

Answer explanation

The correct example of a mutualistic relationship is a bee pollinating a flower while collecting nectar, as both species benefit from the interaction.

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NGSS.MS-LS2-2

Energy transfer between trophic levels in an ecosystem is usually around what percentage efficient?

• 10%

• 25%

• 50%

• 75%

Answer explanation

Energy transfer between trophic levels in an ecosystem is usually around 10% efficient, making 10% the correct choice.

Tags

NGSS.MS-LS2-3

Which of the following best describes secondary consumers in an ecosystem?

• They produce their own food through photosynthesis.

• They feed on primary producers.

• They feed on primary consumers.

• They decompose dead organisms.

Answer explanation

Secondary consumers in an ecosystem feed on primary consumers, making them the best description of secondary consumers.

Tags

NGSS.MS-LS2-3

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