ECOLOGY TEST ANSWER
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Ecology Test
1. The pyramids of biomass are always inverted in
a) Pond ecosystem
b) Desert ecosystem
c) Grassland ecosystem
d) Forest ecosystem
Answer A
2. The interspecific interaction between the termites and protozoans(Trichonympha sp.), present in the guts of termites is called
a)Amensalism
b)Mutualism
c)Commensalism
d)Parasitism
Answer B
3. The grazing pathway of energy flow is relatively more important then the detritus pathway in
a) Grassland ecosystem
b) Tropical forest ecosystem
c) Pond ecosystem
d) Marine ecosystem
Answer A
4. Similar environment in different continents produce similar type of ecosystems. Species occupying similar ecological niche in such disjunct ecosystems are known as
a) Ecological guilds
b) Ecotypes
c) Ecological indicators
d) Ecological equivalents
Answer D
5. A taxon facing an extremely high risk of extinction in the wild in the immediate future is regarded as
a) Endangered
b) Vulneable
c) Near threated
d) Critically endangered
Answer D
6. With reference to ecological niche, consider the following statements:
1. Often, within the same species, different stages in the organisms'life history occupy different niches.
2. In some species, niche segregation may occur between sexes. When niches of two species overlap, it always results in the elimination of one species. Which of the statements given above is/ are correct?
a) 1 and 2 only
b) 1 and 3 only
c) 2 only
d) 1, 2 and 3
Answer C
7. Among the following, which one is the most productive ecosystem in terms of mean net primary productivity (g/m2/ year)
a) Tropical rain forest
b) Tropical seasonal forest
c) Swamp and marsh
d) Coral reef
Answer B
8. Eutrophication of lakes results in
1. increase in species richness
2.increases in detritus content
3. increase in in nitrate content Which of the statements given above are correct?
a) 1, 2 and 3
c) 2 and 3 only
d) 3 only
Answer C
9. Biological Oxygen Demand (BOD) refers to the amount of oxygen required to
a) Break down the organic materials
b)Facilitate respiration
c)Synthesise organic compounds
d) Convert inorganic materials to their oxides and cause their precipitation
Answer A
10. Who among the following is assoiated with the description of Y shaped or 2 channel energy flow model applicable to both terrestrial and aquatic ecosystems?
a) Hardin
b)Odum
c) Shelford
d) Liebig
Answer B
Answer B
11. The type of vegetation in climate having temperature range 5-200C and rainfall 150-300 cm will be
a) Temperate deciduous
b) Temperate evergreen
c) Taiga
d) Grasslands
Answer A
12. Among the following which is the best indicator of water pollution due to mixing of human faeces
a) Paramecium
b) Bacillus
c) Trypanasoma
d) E.coli
Answer D
13. Among the following which is not an characteristic feature of r-selected species (June 2006)
a) Maturity at later stage
b) large clutch size
c) small size of offspring
d) maturity at early stage of life
Answer A
14. It has been observed the bacteria secretes toxin at high population density to check the population size. This phenomenon is termed as
a) Quorum sensing
b) Population control
c) Alleopathy
d) Interspecific completion
Answer A
15. The accumulation of DDT has decreased the population of pelican ducks because DDT
a) Killed all ducken
b) decreased availability of Ca for egg shells which leads into thin shelled fragile eggs
c) Stopped synthesis of eggs
d) Interfered Ca metabolism
Answer B
16. Hot spots are primarily designated on basis
a) Endemism
b) Species diversity
c) Area covered species
d) Flowering plant species
Answer A
17. Phytoplankton spends very little energy on developing protective structures against predator, this suggests that why
a) Food chain is small
b) There is less competition
c) Productivity of aquatic ecosystem is low
d) Assimilation efficiency is high in aquatic ecosystem
Answer B
18. Temporary fluctuation in population size is due to
a) Migration
b) Carrying capacity
c) Bottle neck
d) Interspecific competition
Answer C
19. Stenohaline organisms can
a) Tolerate Narrow range of salt concentration
b)Tolerate wide range of salt
c) Escapes salty conditions
d) Can secrete extra salt to keep salt amount constant
Answer A
20. Effective population size for completely monogamous species having 40 males and 10 females would be
a) 42
b) 32
c) 20
d) 10
Answer B
21.Characteristic feature of K-selected species is
a) High intrinsic rate of growth
b) small size and large number of offsprings
c) large age at first reproduction
d) short life span
Answer C
22. Biodiversity hot spots are characterized on the basis of
a) Endemic flowering plants and threat perception
b) Endemic flowering plants
c) Species of flowering plants
d) Treat perception
Answer B
23.Which national park is not correctly matched with its organism
a) Ranthambore-Bengal Tiger
b) Rajaji- Hollock gibbon
c) Kanchanjanga- Rhino ceros
d) Bandipur -Elephant
Answer B
24. Correct order for increasing order of primary productivity is
a) Ocean-Desert-Tropical deciduous forest-tropical rain forest
b) Desert- tropical deciduous- ocean -tropical rain forest
c) Tropical rain forest- ocean- tropical deciduous-Deserts
d) Tropical deciduous-Desert-ocean-Tropical rain forest
Answer A
25. Type III survivorship curve is shown by
a) Birds
b) Pelagic fishes
c) Humans
d) Phytophagous insects
Answer D
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