MCQ on Ecosystem with Answers PDF | Ecology Questions for NEET pdf
1. Ecology is connected with the study of
(a) environmental factors
(b) effect of plants on environment
(c) plant adaptations
(d) All of the above
Ans. d
2. The term ‘ecology’ was actually coined by
(a) Aristotle
(b) Reiter
(c) Linnaeus
(d) Odum
Ans. b
3. Climate zone between 20-40°C is
(a) sub-tropical
(b) temperate
(c) Both (a) and (b)
(d) temperate and sub-Arctic
Ans. a
4. Winters are absent in climatic zone
(a) sub-tropical
(b) tropical
(c) alpine
(d) Arctic
Ans. b
5. Aquatic plants generally have a
(a) weil-developed vascular system
(b) reduced vascular system
(c) well-developed root system
(d) well-developed stomatal system
Ans. b
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6. Succession of communities occurs because
(a) each existing community changes the environment
(b) climatic changes lead to reduced water availability
(c) most population have a limited lifespan and die making room for others
(d) resources in an area are limited
Ans. a
7. A lake with rich nutrients is known as
(a) euphotic
(b) eutrophic
(c) aphotic
(d) oligotrophic
Ans. b
8. Study of inter-relationships between organisms and their environment is
(a) ecology
(b) ecosystem
(c) phytogeography
(d) ethology
Ans. a
9. Study of inter-relationship between an entire community and its environment is
(a) autecology
(b) resource ecology
(c) species ecology
(d) synecology
Ans. d
10. Tropical zone extends from
(a) 0-30°C
(b) 0-20°C
(c) 10-23°C
(d) 5-30°C
Ans. b
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11. A plant devoid of roots is
(a) Wolffia/Ceratophyllum
(b) Vallisneria
(c) Hydrilla
(d) Azolla
Ans. a
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12. Mean annual temperature of tropical zone is
(a) 10°C
(b) 16°C
(c) 24°C
(d) 30°C
Ans. c
13. The floating leaves of an aquatic plant has
(a) stomata on the upper surface
(b) stomata on the lower surface
(c) stomata on both the surfaces
(d) no stomata
Ans. a
14. In sub-merged hydrophytes, the stomata occurs
(a) on lower surface
(b) on upper surface
(c) no where
(d) Both (a) and (b)
Ans. c
15. Thick cuticle occurs on the leaves of plants belonging to
(a) cool habitats
(b) warm habitats
(c) dry habitats
(d) wet habitats
Ans. c
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16. Weather represents
(a) short term properties of atmosphere
(b) seasonal changes in atmosphere
(c) average variations of atmospheric conditions
(d) All of the above
Ans. a
17. Sub-merged hydrophytes have a well developed
(a) vascular system
(b) aerenchyma
(c) root system
(d) stomatal system
Ans. b
18. Stem of sub-merged hydrophytes is soft and weak because of
(a) the absence of phloem
(b) the absence of stomata
(c) the absence of xylem
(d) feebly developed supporting tissue and xylem
Ans. d
19. Which one is the famous plant ecologist of India?
(a) Charles Darwin
(b) Ramdev Mishra
(c) Birbal Sahani
(d) Jagdish Chandra Bose
Ans. b
20. The role of an organism in ecological system is known as
(a) habitat
(b) herbivory
(c) niche
(d) interaction
Ans. c
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21. The primary consumers in a pond ecosystem is
(a) phytoplankton
(b) zooplankton
(c) fishes
(d) bacteria
Ans. b
22. The organic substances which decompose slowly are
(a) chitin
(b) lignin
(c) cellulose
(d) All of these
Ans. d
23. The food chain which start from microorganism is
(a) terrestrial food chain
(b) grazing food chain
(c) detritus food chain
(d) predator food chain
Ans. c
24. Decomposers are always
(a) autotrophs
(b) primary consumers
(c) saprotrophs
(d) heterotrophs
Ans. c
25. The type of food chain in which decomposed organic matter is converted into energy rich compound is called
(a) detritus food chain
(b) grazing food chain
(c) cybernatics
(d) None of these
Ans. a
26. Consumers are also known as
(a) reducers
(b) transducers
(c) consumers
(d) producers
Ans. a
27. Biotic community which shows the number of feeding connections is categorised as
(a) food chain
(b) pyramid of number
(c) food web
(d) trophic levels
Ans. c
28. Organism having wide range of degree of tolerance are
(a) stenotypic
(b) eurotypic
(c) ecotypics
(d) ecophenes
Ans. b
29. The efficiency of any ecosystem is best depicted by the pyramid of
(a) energy
(b) number
(c) biomass
(d) volume
Ans. a
30. Energy and nutrients enter a community by the way of
(a) producer
(b) consumer
(c) scavenger
(d) detritivores
Ans. a
31. Which one is the factor of abiotic environment?
(a) Producer
(b) Consumer
(c) Decomposer
(d) Air
Ans. d
