Ecosystem Chapter-Wise Test 20

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which trophic level does a secondary consumer occupy in a grazing food chain?

First
Second
Third
Fourth
3

Secondary consumers feed on primary consumers and occupy the third trophic level in a grazing food chain.

Which of the following factors affects the rate of decomposition?

Temperature and soil moisture
Presence of herbivores
Wind speed
Number of primary producers
1

Temperature and soil moisture significantly influence microbial activity and the rate of decomposition.

Which of the following is an example of a primary consumer in an aquatic ecosystem?

Phytoplankton
Zooplankton
Small fish
Sharks
2

Zooplankton are primary consumers as they feed on phytoplankton, the primary producers in an aquatic ecosystem.

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

Breakdown of detritus into smaller particles
Conversion of organic matter into inorganic substances
Dissolution and removal of water-soluble inorganic nutrients
Accumulation of resistant organic material
3

Leaching involves the removal of water-soluble inorganic nutrients, which move downward in the soil and sometimes become unavailable to plants.

Which factor most directly influences the rate of primary productivity?

Amount of decomposers
Availability of sunlight
Number of secondary consumers
Predation rate
2

The availability of sunlight is a primary factor affecting the rate of photosynthesis and, consequently, primary productivity.

Which of the following statements about net primary productivity (NPP) is incorrect?

NPP is the energy available to herbivores
NPP is always greater than gross primary productivity (GPP)
NPP accounts for respiration loss
NPP is influenced by environmental conditions
2

NPP is always less than GPP because it accounts for the energy lost through respiration.

Why is the pyramid of number sometimes inverted in a forest ecosystem?

Producers are more numerous than consumers
A few large trees support many herbivores
Consumers store more energy than producers
Energy transfer is 100% efficient
2

In a forest ecosystem, a few large trees (producers) support a larger number of herbivores, causing an inverted pyramid of number.

Which ecological pyramid can be inverted in a forest ecosystem?

Pyramid of biomass
Pyramid of energy
Pyramid of number
Both 1 and 3
3

In a forest ecosystem, a single tree (producer) supports many herbivores, making the pyramid of number inverted.

Which component of an ecosystem converts inorganic substances into organic material using sunlight?

Consumers
Decomposers
Autotrophs
Detritivores
3

Autotrophs, such as green plants and algae, convert inorganic substances into organic matter using sunlight through photosynthesis.

Which of the following is an incorrect statement about decomposers?

Decomposers break down organic matter
Decomposers help in nutrient recycling
Decomposers contribute to humus formation
Decomposers are not involved in food chains
4

Decomposers are involved in food chains, especially in the detritus food chain, where they break down organic material.

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