Ecosystem Chapter-Wise Test 24

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following ecological pyramids can NEVER be inverted?

Pyramid of number
Pyramid of biomass
Pyramid of energy
Pyramid of productivity
3

The pyramid of energy is always upright because energy decreases at each trophic level due to heat loss.

Which of the following represents a grazing food chain?

Grass → Goat → Man
Dead leaves → Earthworm → Bird
Bacteria → Fungus → Plants
Fish → Plankton → Shark
1

A grazing food chain begins with producers (plants) and moves up to herbivores (goat) and then to carnivores (man).

Which of the following statements about food webs is correct?

Food webs consist of only a single food chain
Food webs show multiple interconnected food chains
Food webs exclude decomposers
Food webs do not involve energy transfer
2

Food webs consist of multiple interconnected food chains, showing the complex feeding relationships within an ecosystem.

What happens to most of the energy captured by producers in an ecosystem?

It is stored permanently
It is transferred completely to the next trophic level
It is lost as heat through respiration
It is converted into minerals
3

Most of the energy captured by producers is lost as heat through respiration, following the Second Law of Thermodynamics.

Which statement about energy flow in an ecosystem is correct?

Energy cycles within the ecosystem
Energy flow is bidirectional
Energy flow is unidirectional
Energy increases at higher trophic levels
3

Energy flow in an ecosystem is unidirectional, moving from producers to consumers and eventually lost as heat.

Which of the following statements about the detritus food chain is correct?

It begins with living plants
It does not involve decomposers
It starts with dead organic matter
It is independent of the grazing food chain
3

The detritus food chain starts with dead organic matter, which is broken down by decomposers before passing energy to consumers.

What is the role of decomposers in the nitrogen cycle?

They fix atmospheric nitrogen
They convert nitrates into nitrogen gas
They release nitrogen from organic matter into the soil
They absorb nitrogen from the air
3

Decomposers release nitrogen from dead organisms and organic matter into the soil, making it available for plants.

Which of the following statements about biological magnification is correct?

Toxic substances decrease at higher trophic levels
It occurs due to the accumulation of pollutants in organisms
Primary producers have the highest concentration of toxins
It has no effect on top predators
2

Biological magnification occurs when toxic substances accumulate in organisms and increase in concentration at higher trophic levels.

Which of the following statements about energy flow in an ecosystem is correct?

Energy flow is cyclic
Energy flow is unidirectional
Energy increases at higher trophic levels
Energy is fully transferred between trophic levels
2

Energy flow in an ecosystem is unidirectional, moving from producers to consumers and eventually lost as heat.

Which of the following correctly describes the "10% Law" of energy transfer?

Only 10% of the energy is transferred to the next trophic level
All energy is transferred to the next trophic level
10% of energy is lost at each trophic level
Producers capture 10% of the sun’s energy
1

According to the 10% Law, only 10% of the energy from one trophic level is transferred to the next, while the rest is lost as heat.

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