Ecosystem Chapter-Wise Test 17

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an example of an abiotic component of an ecosystem?

Plants
Animals
Soil
Bacteria
3

Abiotic components include non-living elements such as soil, water, temperature, and sunlight.

Which of the following organisms is an example of a tertiary consumer?

Grass
Goat
Frog
Snake
4

A snake is a tertiary consumer in a food chain, as it feeds on secondary consumers like frogs.

What is the role of decomposers in the ecosystem?

Fix carbon dioxide
Recycle nutrients back into the environment
Convert inorganic matter into organic compounds
Increase primary productivity
2

Decomposers break down organic matter and recycle essential nutrients back into the ecosystem, maintaining nutrient balance.

Which of the following statements about ecological pyramids is incorrect?

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 relationships
2

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

What is the main function of ecological pyramids?

To show the interdependence of species
To display the relative number, biomass, or energy at different trophic levels
To measure the biodiversity of an ecosystem
To determine the rate of decomposition
2

Ecological pyramids represent the relative amount of energy, biomass, or number of organisms at different trophic levels in an ecosystem.

Which statement about food webs is correct?

They consist of a single linear pathway
They show multiple interconnected food chains
They include only producers and consumers
They do not include decomposers
2

Food webs are complex networks of interconnected food chains that show multiple feeding relationships in an ecosystem.

Which of the following statements about an inverted pyramid of biomass in an aquatic ecosystem is correct?

Phytoplankton have a higher biomass than zooplankton
Zooplankton have a higher biomass than phytoplankton
The biomass of producers is always greater than consumers
Pyramids of biomass are never inverted
2

In aquatic ecosystems, the pyramid of biomass is often inverted because zooplankton have a higher biomass than phytoplankton.

Which of the following is a correct statement about biological magnification?

Toxins accumulate at lower trophic levels
Toxic substances increase in concentration at higher trophic levels
It does not affect top predators
It is not influenced by human activities
2

Biological magnification leads to an increased concentration of toxins in organisms at higher trophic levels, affecting top predators.

What type of pyramid is generally inverted in aquatic ecosystems?

Pyramid of number
Pyramid of biomass
Pyramid of energy
Pyramid of productivity
2

In aquatic ecosystems, the biomass pyramid is often inverted because the biomass of phytoplankton (producers) is lower than that of zooplankton.

Which of the following is an example of a man-made ecosystem?

Pond
Forest
Crop field
River
3

A crop field is a man-made ecosystem where plants are cultivated for food production.

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