Ecosystem Chapter-Wise Test 19

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an example of an organism found in the detritus food chain?

Caterpillar
Earthworm
Eagle
Grasshopper
2

Earthworms play a crucial role in the detritus food chain by breaking down organic matter and facilitating decomposition.

Which of the following correctly explains the term "trophic level"?

A specific position in a food chain occupied by an organism
The number of species in an ecosystem
The biomass of decomposers in a food web
The amount of energy lost at each step of a food chain
1

A trophic level represents the position an organism occupies in a food chain, such as producers, primary consumers, or secondary consumers.

Which of the following is the largest contributor to global primary productivity?

Deserts
Tropical rainforests
Polar regions
Deep-sea ecosystems
2

Tropical rainforests contribute the most to global primary productivity due to their high biodiversity and favorable climatic conditions.

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

It begins with dead organic matter
It does not include decomposers
It is always shorter than the grazing food chain
It does not contribute to nutrient cycling
1

The detritus food chain starts with dead organic matter, which is decomposed and converted into nutrients for further use.

Which of the following is an incorrect statement about the water cycle?

Evaporation leads to cloud formation
Transpiration contributes to atmospheric moisture
Groundwater plays no role in the water cycle
Precipitation returns water to Earth's surface
3

Groundwater is an essential part of the water cycle, supplying water to plants, rivers, and lakes.

Which of the following statements about energy transfer in food chains is incorrect?

Only about 10% of energy is passed to the next trophic level
Energy is lost as heat at each trophic level
Consumers gain more energy than producers
Energy transfer follows the second law of thermodynamics
3

Consumers gain less energy than producers due to energy loss at each trophic level.

Which of the following organisms is NOT a detritivore?

Earthworm
Fungi
Bacteria
Grasshopper
4

Grasshoppers are herbivores, not detritivores. Detritivores, such as earthworms, fungi, and bacteria, decompose dead organic matter.

Which of the following is an incorrect statement about the nitrogen cycle?

Denitrification converts nitrates into nitrogen gas
Nitrogen fixation makes atmospheric nitrogen available to plants
Plants directly absorb nitrogen gas from the atmosphere
Decomposers release nitrogen from organic matter into the soil
3

Plants cannot absorb nitrogen gas directly from the atmosphere; they depend on nitrogen-fixing bacteria to convert it into usable forms.

Which of the following statements about trophic levels is incorrect?

Producers form the first trophic level
Carnivores belong to the second trophic level
Energy decreases at higher trophic levels
Primary consumers feed on producers
2

Carnivores do not belong to the second trophic level; they are secondary or tertiary consumers.

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

Grass
Deer
Frog
Hawk
3

A frog is a secondary consumer because it feeds on insects, which are primary consumers.

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