Ecosystem Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which trophic level do carnivores that feed on herbivores belong to?

First trophic level
Second trophic level
Third trophic level
Fourth trophic level
3

Carnivores that feed on herbivores belong to the third trophic level in a food chain.

Which of the following organisms is a tertiary consumer in a forest ecosystem?

Deer
Grass
Frog
Leopard
4

Leopards are tertiary consumers as they feed on secondary consumers like frogs and smaller carnivores.

Which of the following processes increases the nutrient content of soil?

Leaching
Humification
Erosion
Desertification
2

Humification increases the nutrient content of soil by forming humus, which retains nutrients and improves soil fertility.

Which of the following is a characteristic of a self-sustaining ecosystem?

Absence of decomposers
Continuous input of solar energy
Lack of nutrient recycling
Complete isolation from surroundings
2

A self-sustaining ecosystem requires a continuous input of solar energy to drive processes like photosynthesis and energy flow.

Which of the following is a major factor contributing to low productivity in deep oceans?

High temperature
Lack of light and nutrients
Excessive oxygen levels
Abundance of phytoplankton
2

Deep oceans have low productivity due to limited sunlight and nutrient availability, which restricts photosynthesis.

Which of the following correctly explains the role of detritivores in an ecosystem?

They break down dead organic matter into smaller fragments
They consume living plants
They act as primary producers
They directly absorb sunlight for energy
1

Detritivores, such as earthworms, break down large pieces of dead organic matter into smaller fragments, aiding decomposition.

Which of the following is an example of a secondary consumer?

Grass
Goat
Frog
Earthworm
3

A frog is a secondary consumer as it feeds on primary consumers like insects.

Which of the following statements about the nitrogen cycle is correct?

Denitrification converts nitrates into nitrogen gas
Plants directly absorb atmospheric nitrogen
Nitrogen fixation releases nitrogen gas into the air
Animals fix atmospheric nitrogen
1

Denitrification is the process by which bacteria convert nitrates back into nitrogen gas, releasing it into the atmosphere.

Which of the following is an example of a detritus food chain?

Algae → Small fish → Large fish
Leaf litter → Earthworms → Birds
Grass → Cow → Tiger
Zooplankton → Fish → Shark
2

A detritus food chain begins with dead organic matter (leaf litter) and is decomposed by organisms such as earthworms before being consumed by other organisms.

Which of the following statements about energy transfer in an ecosystem is incorrect?

Energy is transferred through trophic levels in a food chain
Energy is lost as heat at each trophic level
Energy cycles continuously within an ecosystem
Only about 10% of energy is passed to the next trophic level
3

Energy does not cycle continuously within an ecosystem; it flows in one direction and is eventually lost as heat.

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