Multiple Choice Questions on Ecology - Ecosystem

1. What is true of ecosystem?
a) Primary consumers are least dependent upon producers
b) Primary consumers out number producers
c) Producers are more than primary consumers
d) Secondary consumers are the largest and most powerful
2. In an ecosystem, which one shows one way passage
a) Nitrogen
b) Carbon
c) Potassium
d) Free energy
3. Upper part of sea/ aquatic ecosystem contains
a) Plankton
b) Nekton
c) Benthos
d) Plankton and Nekton
4. Pyramid of numbers in a grassland/ tree ecosystem is
pyramid of numbers in grass land
a) Always inverted
b) Always upright
c) Both a) and b)
d) Spindle shaped
5. Food chain in which microorganisms breakdown the food formed by primary producers is
a) Parasitic food chain
b) Detritus food chain
c) Consumer food chain
d) Predator food chain
6. Pick up the correct food chain
a) grass-> chameleon-> insect-> bird
b) grass-> fox-> rabbit-> bird
c) phytoplankton-> zooplankton-> fish
d) Fallen leaves -> bacteria-> insect larvae
7. Association of animals when both partners are benefitted
a) colony
b) Mutualism
c) Commensalism
d) Ammensalism
8. Pyramid of numbers deals with the number of
a) Species in area
b) Subspecies in a community
c) Individuals in a community
d) Individuals in a tropic level
9. The sum total of the populations of the same kind of organisms constitute
a) colony
b) Genus
c) Species
d) Community
10. The dominant second trophic level, in a lake ecosystem, is

Lake ecosystem
a) Benthos
b) Plankton
c) Zooplankton
d) Phytoplankton
Answers
1. c) Producers are more than primary consumers
2. d) Free energy
3. a) Plankton
4. b) Always upright
5.  b) Detritus food chain
6. c) phytoplankton-> zooplankton-> fish
7. b) Mutualism
8. d) Individuals in a tropic level
9. c) Species
10. c) Zooplankton

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