Ecosystem Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is NOT considered a component of an ecosystem?

Producers
Consumers
Decomposers
Ecological pyramids
4

Ecological pyramids represent the structure of an ecosystem but are not a functional component of it.

Which of the following statements about food chains is correct?

Food chains always start with a consumer
Food chains can exist independently without food webs
Food chains represent the flow of energy in an ecosystem
All energy in a food chain is transferred without any loss
3

Food chains illustrate the transfer of energy from producers to consumers within an ecosystem.

Which factor plays the most important role in the rate of decomposition?

Amount of sunlight
Temperature and moisture
Size of the ecosystem
Presence of large animals
2

Temperature and soil moisture greatly influence the rate of decomposition by affecting microbial activity.

Which of the following is a correct statement about decomposers?

Decomposers fix atmospheric nitrogen
Decomposers break down organic matter and recycle nutrients
Decomposers only consume living organisms
Decomposers are not involved in nutrient cycling
2

Decomposers break down dead organic matter and recycle essential nutrients back into the ecosystem.

Which statement about food chains is correct?

Energy transfer is 100% efficient
Each level has a fixed amount of energy
Energy decreases at higher trophic levels
Energy is equally distributed among all organisms
3

Energy decreases at higher trophic levels due to heat loss in metabolic activities.

Which type of food chain starts with dead organic matter?

Grazing food chain
Detritus food chain
Aquatic food chain
Terrestrial food chain
2

The detritus food chain starts with dead organic matter, which is decomposed by microorganisms before passing through different consumers.

What is the correct sequence of decomposition processes?

Leaching → Humification → Fragmentation → Catabolism
Fragmentation → Leaching → Catabolism → Humification
Humification → Fragmentation → Leaching → Mineralization
Fragmentation → Catabolism → Leaching → Mineralization
2

Decomposition follows the sequence: Fragmentation (breaking into smaller particles), Leaching (dissolution of nutrients), Catabolism (breakdown by microbes), and Humification or Mineralization.

Which trophic level do carnivores that feed on herbivores occupy?

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

Carnivores that feed on herbivores are secondary consumers and occupy the third trophic level in a food chain.

Why does the amount of energy decrease at each trophic level in a food chain?

Due to heat loss in metabolic processes
Because energy is destroyed at each level
Because lower trophic levels do not store energy
Because energy is continuously recycled
1

Energy decreases at each trophic level due to heat loss in respiration and metabolic processes, following the Second Law of Thermodynamics.

Which of the following statements about food webs is correct?

Food webs consist of multiple interconnected food chains
Food webs exclude decomposers
Food webs do not show energy flow
Food webs are less stable than food chains
1

Food webs are formed by multiple interconnected food chains, illustrating complex feeding relationships in an ecosystem.

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