Ecosystem (Multiple Choice Questions and Answers)

Ecosystem

Multiple Choice Questions and Answers

1. The importance of ecosystem lies in

(a) flow of energy

(b) cycling of materials

(c) both the above

(d) none of the above

Answer: (c) both the above

2. The recycling of elements in an ecosystem is called

(a) chemical cycle

(b) geological cycle

(c) biogeochemical cycle

(d) geochemical cycle

Answer: (c) biogeochemical cycle

3. The source of energy in an ecosystem is

(a) decomposition of animals and plants by bacteria

(b) photosynthesis by plants

(c) fermentation by sugar

(d) sun light

Answer: (d) sun light

4. The first link in any food chain is always a green plant because

(a) they are widely distributed

(b) they are firmly fixed to soil

(c) they alone have the capacity to fix atmospheric carbon dioxide in the presence of sunlight

(d) there are more herbivorous animals than carnivores

Answer: (c) they alone have the capacity to fix atmospheric carbon dioxide in the presence of sunlight

5. Trophic level are formed by

(a) only plants

(b) only animals

(c) only coronavirus

(d) organism linked in food chains

Answer: (d) organism linked in food chains

6. Biological equilibrium occurs among the

(a) producers and consumers

(b) producers and decomposers

(c) producers consumers and decomposers

(d) producers themselves

Answer: (c) producers consumers and decomposers

7. A plant, being eaten by a herbivore which in turn is eaten by a carnivore, makes

(a) food chain

(b) web of food

(c) omnivores

(d) interdependence

Answer: (a) food chain

8. If all the green plant where to disappear from the Earth

(a) all the animals will die

(b) only herbivores will die

(c) only carnivores will die

(d) it will not matter to any animal

Answer: (a) all the animals will die

 9. The non green plants are as important as green plants because they

(a) cause human diseases

(b) cause diseases of other plants

(c) are useful in several industries

(d) bring about the decomposition of dead animals and plants remains

Answer: (d) bring about the decomposition of dead animals and plants remains

10. The pyramid of numbers in grassland ecosystem will be

(a) linear

(b) upright

(c) irregular

(d) inverted

Answer: (b) upright

11. The pyramid of energy is

(a) always upright

(b) always inverted

(c) both upright and inverted

(d) none of the above

Answer: (a) always upright

 12. The planktonic forms of plants are

(a) autotrophs

(b) heterotrophs

(c) chemotrophs

(d) insectivorous types

Answer: (a) autotrophs

13. A community is

(a) a collection of plants and animals

(b) organisms living in a habitat

(c) autotrophs and heterotrophs

(d) web of life

Answer: (b) organisms living in a habitat

14. Ecosystem has two components

(a) plants and animals

(b) weeds and trees

(c) biotic and abiotic

(d) frogs and mentions

Answer: (c) biotic and abiotic

 15. The organisms at the base of food chain are

(a) herbivores

(b) photosynthetic plants

(c) saprophytic plants

(d) carnivores

Answer: (b) photosynthetic plants

 16. In abiotic components of an ecosystem which of the following occurs

(a) flow of energy

(b) cycling of materials

(c) consumers

(d) flow of energy and cycling of material

Answer: (b) cycling of materials

17. In natural ecosystem, decomposers include

(a) only bacteria and fungi

(b) only microscopic animals

(c) the above two types of organisms plus macroscopic animals

(d) only the above two types of organisms

Answer: (a) only bacteria and fungi

 18. Ecosystem is

(a) both open and closed unit depending upon biomass present

(b) closed unit

(c) open unit

(d) both open and closed unit depending upon community

Answer: (b) closed unit

 19. Organisms of the same trophic level are

(a) cheetah and wild boar

(b) deer and honey bee

(c) snake and earthworm

(d) crow and cow

Answer: (b) deer and honey bee

 20. There is no difference between the following

(a) trophic level 1 and herbivores

(b) primary consumers and herbivores

(c) primary consumers and trophic level II

(d) secondary consumers and herbivores

Answer: (b) primary consumers and herbivores

 21. The driving force of the ecosystem is

(a) carbohydrates in plants

(b) biomass

(c) producer

(d) solar energy

Answer: (d) solar energy

 22. The ecosystem receive nitrogen from outside through

(a) industries

(b) electrification of nitrogen

(c) biological nitrogen fixation

(d) all the above

Answer: (d) all the above

 23. Generally the food chain has how many trophic levels?

(a) 1

(b) 2

(c) 4 or more

(d) 3

Answer: (d) 3

 24. Which of the following is a correct sequence of food chain?

(a) fallen- leaves- bacteria- insect- larvae- birds

(b) phytoplankton – zooplankton- fish

(c) grasses-fox-rabbit

(d) grasses-chamelion-insects-birds

Answer: (b) phytoplankton – zooplankton- fish

25. Which of the following word is related to Homo sapiens?

(a) herbivores

(b) carnivores

(c) autotroph

(d) omnivore

Answer: (d) omnivore

26. Which is the most stable ecosystem?

(a) mountain

(b) desert

(c) forest

(d) ocean

Answer: (d) ocean

27. Ecosystem contains

(a) producers

(b) consumers

(c) decomposers

(d) all the above

Answer: (d) all the above

 28. The term eosystem was coined by

(a) Odum

(b) Ernst Haeckel

(c) Tansley

(d) Reiter

Answer: (c) Tansley

 29. Which of the following ecosystems has highest gross primary productivity?

(a) grasslands

(b) coral reefs

(c) mangroves

(d) rainforest

Answer: (a) grasslands

 30. The 10% energy transfer law of food was given by

(a) Stanley

(b) Wiesman

(c) Lindemann

(d) Tansley

Answer: (c) Lindemann

 31. Niche of a species means

(a) the specific place where an organism lives

(b) the specific function of species

(c) the habitat and specific function of a species

(d) none of these

Answer: (c) the habitat and specific function of a species

 32. Part of the earth that inhabits living organism is called

(a) biome

(b) biotrophy

(c) biosphere

(d) biodata

Answer: (c) biosphere

 33. In a food chain, the total amount of living material is depicted by

(a) pyramid of energy

(b) pyramid of numbers

(c) pyramid of biomass

(d) all the above

Answer: (c) pyramid of biomass

 34. Pyramid of energy in a pond ecosystem is always

(a) inverted

(b) upright only

(c) irregular

(d) linear

Answer: (b) upright only

 35. The rate at which light energy is converted to the chemical energy of organic molecules in the ecosystem is

(a) gross secondary productivity

(b) net primary productivity

(c) gross primary productivity

(d) net secondary productivity

Answer: (b) net primary productivity

 36. The treeless biome includes

(a) deserts

(b) grassland

(c) tundra

(d) all of these

Answer: (d) all of these

 37. Pyramid of energy in pond ecosystem is always

(a) inverted

(b) linear

(c) upright only

(d) irregular

Answer: (c) upright only

 38. The correct sequence of food chain is

(a) bacteria- grass- rabbit- wolf

(b) grass- snake- insect- deer

(c) grass- wolf- deer- buffalo

(d) grass- insect- birds -snake

Answer: (d) grass- insect- birds -snake

 39. In an aquatic environment microscopic plants and animals are collectively known as

(a) commensals

(b) herbivores

(c) fauna and flora

(d) planktons

Answer: (d) planktons

 40. Which of the following habitats is most unstable for primary productivity?

(a) meadow

(b) forested riverbank

(c) cave

(d) pond

Answer: (c) cave

 41.  Which of the following occurs in abiotic components of an ecosystem?

(a) flow of energy

(b) cycling of materials

(c) consumers

(d) flow of energy and cycling of materials

Answer: (b) cycling of materials

 42. The transfer of energy from organism to organism in a natural community establishes

(a) food chain

(b) biological control

(c) natural barriers

(d) all of these

Answer: (a) food chain

 43. Type of ecological pyramid is occupied by

(a) herbivores

(b) carnivores

(c) produces

(d) none of these

Answer: (b) carnivores

 44. The snakes are included under

(a) saprophytes

(b) primary consumer

(c) secondary trophic level

(d) none of these

Answer: (c) secondary trophic level

 45. Zooplanktons forms are

(a) primary consumers

(b) secondary consumers

(c) carnivores

(d) primary producers

Answer: (a) primary consumers

46. Food chain are met only in the

(a) sea

(b) forests

(c) deserts

(d) in all these places

Answer: (d) in all these places

 47. In an upright pyramid of biomass, the herbivores occupy the position

(a) 4

(b) 2

(c) 3

(d) 1

Answer: (b) 2

48. Which ecosystem has the highest primary productivity?

(a) pond ecosystem

(b) lake ecosystem

(c) grassland ecosystem

(d) forest ecosystem

Answer: (d) forest ecosystem

 49.  The shape of pyramid of energy in the grassland and pond ecosystem is

(a) inverted

(b) upright

(c) inverted and upright

(d) rhomboidal

Answer: (b) upright

 50. Transition zone between two ecological types is inhabited by

(a) ecotone

(b) ecotype

(c) ecosystem

(d) ecad

Answer: (a) ecotone