Ecosystem Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

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

Desert
Forest
Grassland
Wetland
4

Wetlands are aquatic ecosystems that contain water and support a variety of plants and animals.

Which of the following best describes fragmentation in the decomposition process?

Breaking down of detritus into smaller particles
Accumulation of humus in the soil
Conversion of inorganic nutrients into organic matter
Removal of soluble substances from detritus
1

Fragmentation is the process of breaking down detritus into smaller particles, making it easier for decomposers to act on them.

What percentage of Photosynthetically Active Radiation (PAR) is used by plants?

100%
50%
2-10%
25%
3

Only 2-10% of the Photosynthetically Active Radiation (PAR) is utilized by plants for photosynthesis.

Which of the following is an incorrect statement about ecological pyramids?

Pyramids of energy are always upright
Pyramids of biomass in aquatic ecosystems are always upright
Pyramids of numbers can be inverted
Ecological pyramids represent trophic structure
2

Pyramids of biomass in aquatic ecosystems can be inverted due to the rapid turnover of phytoplankton.

Which of the following statements about food webs is correct?

Food webs consist of multiple interconnected food chains
Food webs include only herbivores
Food webs exclude decomposers
Food webs do not show energy flow
1

Food webs represent multiple interconnected food chains, showing complex feeding relationships in an ecosystem.

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

It starts with living plants
It begins with dead organic matter
It does not involve decomposers
It is independent of grazing food chains
2

The detritus food chain starts with dead organic matter, which decomposers break down before energy is transferred to consumers.

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

Deer
Snake
Frog
Hawk
1

Deer are herbivores that feed on producers (plants), making them primary consumers.

Which of the following processes is responsible for the conversion of complex organic matter into simpler inorganic substances?

Humification
Leaching
Decomposition
Fragmentation
3

Decomposition is the process by which decomposers break down complex organic matter into simpler inorganic substances like carbon dioxide, water, and nutrients.

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

Grass → Deer → Lion
Phytoplankton → Zooplankton → Small fish
Dead leaves → Earthworms → Birds
Algae → Mollusks → Fish
3

The detritus food chain begins with dead organic matter, which is decomposed by organisms like earthworms before being consumed by higher-level organisms.

Which of the following best describes the function of ecological pyramids?

They show nutrient cycling
They represent energy flow and biomass distribution
They track the migration of species
They show weather patterns
2

Ecological pyramids represent energy flow, biomass distribution, and population size at different trophic levels in an ecosystem.

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