Ecosystem MCQs Of NEET previous year questions
The students who are targeting for NEET exam should prepare for all the important chapters of NEET syllabus to secure good marks in NEET 2022. Candidates planning to appear in the medical exam must have knowledge about the weightage of chapters. Biology section carries the maximum weightage.
Ecosystem Previous Year MCQs And Answers
1. Which ecosystem has the maximum biomass? (NEET 2017)
(a) Grassland ecosystem
(b) Pond ecosystem
(c) Lake ecosystem
(d) Forest ecosystem
Solution : D
2. The primary producers of the deep sea hydrothermal vent ecosystem are: (NEET II 2016)
(a) green algae
(b) chemosynthetic bacteria
(c) blue green algae
(d) coral reefs
Solution : B
3. Which of the following would appear as the pioneer organisms on bare rocks? (NEET I 2016)
(a) Mosses
(b) Green algae
(c) Lichens
(d) Liverworts
Solution : C
4. Which one of the following is a characteristic feature of cropland ecosystem? (NEET I 2016)
(a) Absence of weeds
(b) Ecological succession
(c) Absence of soil organisms
(d) Least genetic diversity
Solution : D
5. The term ecosystem was coined by (NEET I 2016)
(a) E. Haeckel
(b) E.Warming
(c) E.P. Odum
(d) A. G. Tansley
Solution : D
6. Most animals that live in deep oceanic waters are (2015)
(a) tertiary consumers
(b) detritivores
(c) primary consumers
(d) secondary consumers
Solution : B
7. During ecological succession (2015)
(a) the numbers and types of animals remain constant
(b) the changes lead to a community that is in near equilibrium with the environment and is called pioneer community
(c) the gradual and predictable change in species composition occurs in a given area
(d) the establishment of a new biotic community is very fast in its primary phase
Solution : C
8. In which of the following both pairs have correct combination? (2015)
(a) Gaseous nutrient Nitrogen and Sulphur cycle Sedimentary Carbon and Phosphorus nutrient cycle
(b) Gaseous nutrient Sulphur and Phosphorus cycle Sedimentary Carbon and Nitrogen nutrient cycle
(c) Gaseous nutrient Carbon and Nitrogen cycle Sedimentary Sulphur and Phosphorus nutrient cycle
(d) Gaseous nutrient Carbon and Sulphur cycle Sedimentary Nitrogen and Phosphorus nutrient cycle
Solution : C
9. The mass of living material at a trophic level at a particular time is called (2015 Cancelled)
(a) net primary productivity
(b) standing crop
(c) gross primary productivity
(d) standing state
Solution : B
10. Vertical distribution of different species occupying different levels in a biotic community is known as
(2015 Cancelled)
(a) zonation
(b) pyramid
(c) divergence
(d) stratification
Solution : D
11. Secondary succession takes place on/in (2015 Cancelled)
(a) newly created pond
(b) newly cooled lava
(c) bare rock
(d) degraded forest
Solution : D
12. Most animals are tree dwellers in a (2015 Cancelled)
(a) temperate deciduous forest
(b) tropical rainforest
(c) coniferous forest
(d) thorn woodland
Solution : B
13. In an ecosystem the rate of production of organic matter during photosynthesis is termed as (2015 Cancelled)
(a) secondary productivity
(b) net productivity
(c) net primary productivity
(d) gross primary productivity
Solution : D
14. Match the following and select the correct option. (2014)
A. Earthworm (i) Pioneer species
B. Succession (ii) Detritivore
C. Ecosystem service (iii) Natality
D. Population growth (iv) Pollination
A B C D
(a) (i) (ii) (iii) (iv)
(b) (iv) (i) (iii) (ii)
(c) (iii) (ii) (iv) (i)
(d) (ii) (i) (iv) (iii)
Solution : D
15. Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (AD). Identify the blanks. (2014)
Solution : C
16. If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? (2014)
(a) 0.02 J
(b) 0.002 J
(c) 0.2 J
(d) 0.0002 J
Solution : A
17. Natural reservoir of phosphorus is : (NEET 2013)
(a) rock
(b) fossils
(c) sea water
(d) animal bones
Solution : A
18. Secondary productivity is rate of formation of new organic matter by (NEET 2013)
(a) consumers
(b) decomposers
(c) producers
(d) parasites
Solution : A
19. Which one of the following processes during decomposition is correctly described? (NEET 2013)
(a) Catabolism – Last step in the decomposition under fully anaerobic condition
(b) Leaching – Water soluble inorganic nutrients rise to the top layers of soil
(c) Fragmentation – Carried out by organisms such as earthworm
(d) Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
Solution : C
20. Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N 2 ) to the atmosphere? (Karnataka NEET 2013)
(a) Aerobic nitrate oxidation and nitrite reduction
(b) Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
(c) Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes
(d) Anaerobic ammonium oxidation and denitrification
Solution : D
21. Which of the following is a primary consumer in maize field ecosystem? (Karnataka NEET 2013)
(a) Grasshopper
(b) Wolf
(c) Phytoplankton
(d) Lion
Solution : A
22. When man eats fish which feeds on zooplanktons which have eaten small plants, the producer in this chain is
(Karnataka NEET 2013)
(a) small plants
(b) fish
(c) man
(d) zooplankton
Solution : A
23. Which one of the following is not a gaseous biogeochemical cycle in ecosystem? (2012)
(a) Sulphur cycle
(b) Phosphorus cycle
(c) Nitrogen cycle
(d) Carbon cycle
Solution : B
24. Identify the possible link “A” in the following food chain. (2012)
Plant→Insect→Frog→"A"→Eagle
(a) Rabbit
(b) Wolf
(c) Cobra
(d) Parrot
Solution : C
25. Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels? (2012)
(a) Level PC is “insects” and level SC is “small insectivorous birds”.
(b) Level PP is “phytoplanktons” in sea and “whale” on top level TC
(c) Level one PP is “pipal trees” and the level SC is “sheep”
(d) Level PC is “rats” and level SC is “cats”
Solution : A
26. Which one of the following is not a functional unit of an ecosystem? (2012)
(a) Energy flow
(b) Decomposition
(c) Productivity
(d) Stratification
Solution : D
27. The upright pyramid of number is absent in (2012)
(a) pond
(b) forest
(c) lake
(d) grassland
Solution : B
28. The rate of formation of new organic matter by rabbit in a grassland, is called (Mains 2012)
(a) net productivity
(b) secondary productivity
(c) net primary productivity
(d) gross primary productivity
Solution : B
29. The second stage of hydrosere is occupied by plants like (Mains 2012)
(a) Azolla
(b) Typha
(c) Salix
(d) Vallisneria
Solution : D
30. Identify the likely organisms (1), (2), (3) and (4) in the food web shown below. (Mains 2012)
Solution : A
31. Mass of living matter at a trophic level in an area at any time is called (2011)
(a) standing crop
(b) detritus
(c) humus
(d) standing state
Solution : A
32. Of the total incident solar radiation the proportion of PAR is (2011)
(a) about 70%
(b) about 60%
(c) less than 50%
(d) more than 80%
Solution : C
33. Which one of the following statements is correct for secondary succession? (2011)
(a) It begins on a bare rock.
(b) It occurs on a deforested site.
(c) It follows primary succession.
(d) It is similar to primary succession except that it has a relatively fast pace
Solution : B
34. Which one of the following statements for the pyramid of energy is incorrect ? (2011)
(a) Its base is broad.
(b) It shows energy content of different trophic level organisms.
(c) It is inverted in shape.
(d) It is upright in shape
Solution : C
35. Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time? (Mains 2011)
(a) Sparrow
(b) Lion
(c) Goat
(d) Frog
Solution : A
36. Both hydrarch and xerarch successions lead to (Mains 2011)
(a) medium water conditions
(b) xeric conditions
(c) highly dry conditions
(d) excessive wet conditions
Solution : A
37. The breakdown of detritus into smaller particles by earthworm is a process called (Mains 2011)
(a) humification
(b) fragmentation
(c) mineralisation
(d) catabolism
Solution : B
38. The biomass available for consumption by the herbivores and the decomposers is called (2010)
(a) net primary productivity
(b) secondary productivity
(c) standing crop
(d) gross primary productivity
Solution : A
39. Which of the following representations shows the pyramid of numbers in a forest ecosystem? (Mains 2010)
(a) D
(b) A
(c) B
(d) C
Solution : C
40. The correct sequence of plants in a hydrosere is (2009)
A. Volvox → Hydrilla → Pistia → Scirpus → Carex → Quercus
B. Pistia → Volvox → Scirpus → Hydrilla → Quercus → Carex
C. Quercus → Carex → Volvox → Hydrilla → Pistia→ Scirpus
D. Quercus → Carex → Scirpus → Pistia → Hydrilla → Volvox
Solution : A
41. Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem? (2009)
(a) Fish
(b) Zooplankton
(c) Frog
(d) Phytoplankton
Solution : A
42. Consider the following statements concerning food chains. (2008)
A. Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
B. Removal of most of the carnivores resulted in an increased population of deers
C. The length of food chains is generally limited to 34 trophic levels due to energy loss
D. The length of food chains may vary from 2 to 8 trophic levels.
Which two of the above statements are correct?
(a) A, D
(b) A, B
(c) B, C
(d) C, D
Solution : C
43. The slow rate of decomposition of fallen logs in nature is due to their (2008)
(a) anaerobic environment around them
(b) low cellulose content
(c) low moisture content
(d) poor nitrogen content
Solution : D
44. About 70% of total global carbon is found in (2008)
(a) oceans
(b) forests
(c) grasslands
(d) agroecosystems
Solution : A
45. Which one of the following ecosystem types has the highest annual net primary productivity? (2007)
(a) Tropical deciduous forest
(b) Temperate evergreen forest
(c) Temperate deciduous forest
(d) Tropical rainforest
Solution : D
46. Which one of the following is not used for construction of ecological pyramids? (2006)
(a) Fresh weight
(b) Dry weight
(c) Number of individuals
(d) Rate of energy flow
Solution : A
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