The ________ is the functional unit of environment.
genus
class
ecosystem
biome
(2)
The ecosystem is the structural and functional unit of the environment through which various biotic and abiotic components interact with one another in relation to their surroundings.
________ is not an abiotic factor.
Humidity
Temperature
Animals
Altitude
(2)
Both plants and animals are the biotic components of a habitat as they are the species that live there. The abiotic components of the ecosystem are non-living materials like rocks, soil, air, and water.
________ are biotic factors.
Mountains
Grass
Rocks
All of these
(3)
Any living component that impacts another organism or shapes the environment is referred to as a biotic component, or biotic factor. Animals, plants, grass, fungus, bacteria, and protists are examples of biotic factors.
A ________ is considered a terrestrial ecosystem.
ocean
pond
underground caves
forest
(4)
A terrestrial ecosystem is a land-based population of species that includes biotic and abiotic interactions in a specific area. Therefore a forest is considered a terrestrial ecosystem.
Which of the following is an abiotic component of the ecosystem?
Lichens on a bare rock
Weathered rock
Planktons in a pond
Sea-weed
(2)
Weathered rock is an abiotic or non-living component of the ecosystem.
Lakes and ponds do not require cleaning but an aquarium does because
an aquarium is an artificial and a complete ecosystem.
lakes and ponds are natural and complete ecosystems.
an aquarium possesses a pool of decomposers.
lakes do not possess any decomposers and thus BOD always remains low.
(2)
Lakes and ponds do not require cleaning but an aquarium does because an aquarium is an artificial ecosystem. It is complete and lacks natural decomposers.
Four students gave 4 different statements about ecosystem. Who is incorrect?
Student A: “Energy can be recycled in an ecosystem.”
Student B: “Matter cannot be recycled in an ecosystem.”
Student C: “Energy cannot be recycled but matter can be recycled in an ecosystem.”
Student D: “Neither energy nor matter can be recycled in an ecosystem.”
Both students A and B
Students A, B and D
Student C
Students A and C
(2)
In an ecosystem, the sun is the only source of energy. The energy is not recycled, but the organic matter, which passes from one trophic level to the next, is recycled by the action of decomposers.
Fishes living in a crop field with standing water are the part of a/an ________ ecosystem.
natural
indigenous
artificial
none of these
(2)
Crop fields are man-made ecosystems. If these have standing water as in the case of rice field, they can be used to culture fish. The fish in this water would be the part of an artificial ecosystem.
Which of the following is NOT a type of natural ecosystem?
Sea
Crop field
Lakes and ponds
Estuaries
(2)
A crop field is made by humans. Hence, it is not a type of natural ecosystem.
Which of the following statements is incorrect?
All green plants and blue green algae are producers.
Green plants get their food from organic compounds.
Producers prepare their own food from inorganic compounds.
Plants convert solar energy into chemical energy.
(2)
Green plants and algae are both producers which means that they can make their own food with the help of inorganic substances and sun energy, through the process of photosynthesis.
