Ecosystem Mock Tests

24 questions available

Ecosystem Mock Test 1

Questions: 24

Sample Questions

Class 12 Biology

An ecological pyramid of energy is always upright (never inverted) because:

A Energy decreases at each successive trophic level due to metabolic heat loss, following the second law of thermodynamics

B Producers always have the largest population size in any ecosystem

C Consumers are always larger in body size than producers

D Energy flows from consumers back to producers in a cycle

Class 12 Biology

In a food chain, the type of ecological pyramid that is always upright is:

A Pyramid of numbers

B Pyramid of biomass

C Pyramid of energy

D All types of ecological pyramids are always upright

Class 12 Biology

Net Primary Productivity (NPP) is calculated as:

A Gross Primary Productivity (GPP) minus respiratory losses (R) of producers

B Gross Primary Productivity (GPP) multiplied by the efficiency of herbivores

C The total energy captured by consumers minus their respiratory losses

D Gross Primary Productivity (GPP) plus the energy input from sunlight

Class 12 Biology

In an ecosystem pyramid of energy, the base always represents:

A Tertiary consumers

B Producers

C Decomposers

D Primary consumers

Class 12 Biology

During decomposition, humification refers to the:

A Formation of humus — a dark, amorphous, highly resistant organic substance that is slowly degraded by microorganisms

B Release of inorganic nutrients from organic matter through mineralisation

C Fragmentation of dead organic matter by detritivores like earthworms

D Leaching of water-soluble inorganic nutrients down into the soil layers

Class 12 Biology

In the nitrogen cycle, the process of nitrification converts ammonia (NH₃) into:

A Nitrite (NO₂⁻) by Nitrosomonas, and then nitrate (NO₃⁻) by Nitrobacter

B Nitrogen gas (N₂) by Azotobacter

C Organic nitrogen compounds by decomposers

D Urea by renal excretion

Class 12 Biology

In an ecosystem, the second trophic level is always occupied by:

A Primary producers (autotrophs)

B Primary consumers (herbivores)

C Secondary consumers (carnivores)

D Decomposers (saprotrophs)

Class 12 Biology

In the process of decomposition of organic matter, which group of organisms plays the most critical role in breaking down complex organic material into simpler inorganic substances:

A Herbivores

B Decomposers (fungi and bacteria)

C Detritivores (earthworms)

D Primary producers

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