Ecosystem
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the primary function of ecological pyramids?

To depict the interrelationship between species
To show the relative amount of energy or biomass at each trophic level
To demonstrate the movement of decomposers
To measure the speed of ecological succession
2

Ecological pyramids visually represent the relative energy, biomass, or numbers at different trophic levels in an ecosystem.

Which of the following is an example of an artificial ecosystem?

Grassland
Forest
Aquarium
Desert
3

An aquarium is an artificial ecosystem where biotic and abiotic factors are maintained by humans.

Which type of ecosystem contributes the highest percentage to the Earth's total net primary productivity?

Desert
Tropical rainforest
Open ocean
Grassland
2

Tropical rainforests have the highest net primary productivity due to their high biodiversity, warm climate, and abundant rainfall.

Which of the following best describes the term "standing crop"?

Total biomass of living organisms at a given time
Total energy lost in an ecosystem
Total decomposed matter in the soil
Total number of decomposers in an ecosystem
1

Standing crop refers to the total biomass of living organisms present in a particular trophic level at a specific time.

Which type of food chain is more dominant in a forest ecosystem?

Grazing food chain
Detritus food chain
Parasitic food chain
All food chains are equally dominant
2

In a forest ecosystem, the detritus food chain is more dominant because a large amount of energy flows through decomposers.

Which of the following best explains why the energy pyramid is always upright?

Energy is completely transferred between trophic levels
Energy is lost as heat at each trophic level
Consumers store more energy than producers
Energy cycles continuously between trophic levels
2

The pyramid of energy is always upright because energy is lost as heat at each trophic level, making energy transfer inefficient.

Which of the following is a correct statement about decomposition?

Decomposition rate is higher in dry environments
Lignin-rich material decomposes faster than simple sugars
High temperature and moisture increase decomposition rate
Decomposition does not contribute to nutrient cycling
3

High temperature and moisture enhance microbial activity, increasing the rate of decomposition.

Which of the following statements about ecosystem stability is correct?

Climax communities are unstable and short-lived
Higher biodiversity contributes to ecosystem stability
Ecosystems do not change over time
Human activities have no impact on ecosystem stability
2

Higher biodiversity contributes to ecosystem stability by ensuring functional redundancy and resilience to disturbances.

Which of the following statements about decomposers is correct?

Decomposers break down organic matter and recycle nutrients
Decomposers store nutrients permanently
Decomposers absorb atmospheric carbon directly
Decomposers are primary consumers
1

Decomposers, such as bacteria and fungi, break down dead organisms and recycle nutrients back into the ecosystem.

Which of the following is an example of a terrestrial ecosystem?

Pond
Lake
Forest
Estuary
3

Forest is a terrestrial ecosystem, whereas ponds, lakes, and estuaries are aquatic ecosystems.

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