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Biology Questions
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1. Which one of the following pairs is not correctly matched?
(a) Manas sanctuary – Assam
(b) Kanha National Park – Madhya Pradesh
(c) Dachigam sanctuary – West Bengal
(d) Bandipur sanctuary – Karnataka
2. The tendency towards increased variety and density of species at community junctions is known as the
(a) edge effect
(b) variability
(c) vital index
(d) biotic potential
3. The movement of individuals into and out of population is caused by birth, death immigration and emigration. Such
a state denotes
(a) population density
(b) population turnover
(c) regulation of population
(d) basic biotic school
4. The ecological importance of predators in a community lies in the fact that they help to
(a) reduce the population of prey
(b) break up the population of prey
(c) increase the population of prey
(d) balance the population of prey
5. DDT has been banned from many developed countries because of its
(a) high toxicity to mammals
(b) high degree of persistence in the environment
(c) low toxicity to insects
(d) high solubility in water
6. Which of the following statements are correct?
(i) Ponotobdella is not a bubicolous worm.
(ii) Parental care is not observed in Icthyophis.
(iii) Upright Hippocampus holds the sea weeds by the finless tail and not snout.
Select the correct answer using the codes given below
Codes:
(a) i, ii and iii
(b) ii and iii
(c) i and ii
(d) i and iii
7. Species having wide geographical ranges often develop locally adapted population called.
(a) prototypes
(b) paratypes
(c) syntypes
(d) ecotypes
8. David Schindler divided a small oligotrophic lake in to two halves by suspending a plastic sheet across a narrow
neck in the middle of the lake, thus preventing the mixing of the waters of two sides of the plastic sheet. He then
added a large amount of phosphates to one half of the lake, leaving the other half as a control. Within a few weeks he
observed that
(a) the phosphates dissolved fully and the water become colored
(b) in the experimental part of the lake the water developed a massive bloom of plankton
(c) in the control part of the lake a luxuriant growth of phytoplankton developed
(d) all the fishes died in the experimental part of the lake
9. In an ecosystem, which of the given components would form a part such that each component influences the
properties of the other?
(i) Abiotic environment
(ii) Biotic communities
(iii) Producer communities
Select the correct answer using the codes given below:
Codes:
(a) i, ii and iii
(b) i and ii
(c) i and iii
(d) ii and iii
10. The ratio between the energy flow at different points along the food chain, when expressed as percentage is
called
(a) ecological gradient
(b) relative ratio of energy flow
(c) energy flow efficiency
(d) ecological efficiency
11. As compared to most of the plants, the red algae can thrive at greater depths in water because they
(a) possess special enzymes for photosynthesis in poor light
(b) can tolerate very cold medium
(c) possess supplementary pigments for absorption of light
(d) have developed tolerance to toxic metabolites
12. The pelagic animals remain floating in open waters without sinking to the bottom. For this ability to remain a float,
which of the following adaptations have been developed by these organisms?
(i) Reduced skeletal and shell materials.
(ii) Incorporation of large amounts of water or air in their tissues.
(iii) Glandular structures that secrete gases into them.
(iv) Hollow bones.
Select the correct answer using the codes given below:
Codes:
(a) ii, iii and iv
(b) i, ii and iii
(c) i, iii and iv
(d) i, ii and iv
13. Match list-I with list-II and select the correct answer using the codes given below the lists
List-I List-II
A. Parasitism relationship 1. Intraspecific
B. Harmful insect 2. Termite
C. Social life 3.Aphid
D. Mating competition 4. Interspecific relationship
5. Elephant
Codes:
A B C D
(a) 3 1 5 2
(b) 4 2 3 1
(c) 3 4 5 2
(d) 4 3 2 1
14. Circadian rhythm is the metabolic or behavioral rhythm of:
(a) 24 minutes cycle
(b) 24 hours cycle
(c) 24 days cycle
(d) 24 months cycle
15. BOD is a measure of polluting organic matter present in a sample of
(a) water
(b) air
(c) soil
(d) bottom mud from a pond
16. Which one of the following forests is known to be a “forest that never burns”?
(a) Coniferous forest
(b) Tropical rain forest
(c) Deciduous forest
(d) Tundra forest
17. Which of the following statements is/are true?
(i) A community and its habitat mutually interact
(ii) A community and its habitat are interdependent
(iii) A community and its habitat exist independently
Select the correct answer using the codes given below
Codes:
(a) i and ii
(b) i alone
(c) i and iii
(d) ii alone
18. Which one of the following factors is not concerned with population regulation in animals?
(a) Territorialism
(b) Hierarchy contest
(c) Threatening displays
(d) Hibernation
19. Tinamus was an endemic genus of flightless birds found in “Bird continent” located in
(a) Palearctic region
(b) Oriental region
(c) Neotropical region
(d) Nearctic region
20. Consider the following conditions
(i) The mimics or the imitative species occur in the same areas which are occupied by the model species.
(ii) Mimics are usually defenseless and they mimic the offensive or harmful animals.
(iii) Mimics are always less in number than the models.
(iv) Even if the imitation is minute, it should be external and visible.
According to Wallace, the conditions necessary for protective mimicry would indude:
(a) i and iii
(b) ii and iv
(c) i, ii and iv
(d) i, ii, iii and iv
21. Humus is
(a) totally decomposed organic matter in the soil
(b) partially decomposed organic matter in the soil
(c) totally decomposed organic matter in a pond
(d) partially decomposed organic matter in a pond
22. Consider the following statements:
In an ecosystem, energy:
(i) Movement is unidirectional.
(ii) Is lost irretrievably.
(iii) Movement is non-cyclic.
(iv) Movement is from higher to lower trophic levels. Of these statements:
(a) i, ii and iii are correct
(b) ii and iv are correct
(c) i, iii and iv are correct
(d) ii, iii and iv are correct
23. Match list-I with list-II and select the correct answer using the codes given below the lists
List-I List-II
A. Ecotone 1. Running water
B. Benthic 2. Replacement of one community by another
C. Sere 3. Transitional zone between two communities
D. Lotic 4. Zone found at the bottom of the sea
Codes:
A B C D
(a) 3 4 2 1
(b) 4 3 2 1
(c) 3 4 1 2
(d) 4 3 1 2
24. Which of the following pairs are correctly matched?
(i) Amensalism…A population is inhibited whereas the other populations remain unaffected
(ii) Predation… A population uses the other as its food.
(iii) Mutualism…. interaction favorable to both and obligatory
Select the correct answer using the codes given below
Codes:
(a) i, ii and iii
(b) i and ii
(c) i and iii
(d) ii and iii
25. Match list-I (Physico-chemical factors) with list-II (Effect) and select the correct answer using the codes given
below the lists
List-I List-II
A. Temperature fluctuations 1. Problem of osmoregulation
B. Light fluctuations 2. Shortage of food to herbivores
C. H+ 3. Affects distribution of animals
D. Low salinity 4. Major limiting factor
A B C D
(a) 2 4 3 1
(b) 4 2 3 1
(c) 2 4 1 3
(d) 4 2 1 3
26. The nature of interrelationship between corals and zooxanthellae is called
(a) cleaning symbiosis
(b) physiological symbiosis
(c) amensalism
(d) protocooperation
27. Which one of the following sets consists entirely of endangered wild life species of India?
(a) Himalayan musk deer, black buck, Indian lion, rhino, sambar
(b) Himalayan musk deer, Indian lion, rhino, wild buffalo, golden cat
(c) Egret, black bear, bison, spotted deer
(d) Himalayan musk deer, great Indian bustard, snow leopard, Kashmir stag, wild ass.
28. Biological clocks of living organisms:
(a) Are chemosensory system receptive to environmental stimuli
(b) Oscillate continuously and environment does not initiate or stop their function
(c) Are regulated by environmental stimuli
(d) Are independent of changes in environment
29. Forest floors in general support a wide variety of arthropods. The predominant forms closely associated with four
tilters are the
(a) insects
(b) ants
(c) mites
(d) spiders
30. Match list-I (Protected areas) with list-II (State) and select the correct answer using the codes given below the
lists
List-I List-II
A. Gulf of Mannar 1. Gujarat
B. Uttarakhand 2. Uttar Pradesh
C. Sunder bans 3. West Bengal
D. Rann of Kutch 4. Tamil Nadu
Codes:
A B C D
(a) 2 4 1 3
(b) 2 4 3 1
(c) 4 2 1 3
(d) 4 2 3 1
31. A community with low species diversity and high dominance is said to be
(a) unproductive but stable
(b) productive but unstable
(c) neither productive nor stable
(d) both productive and stable
32. Some insect populations have one generation per year.
Some insects also depend upon annual crop. Besides there is the phenomenon called algal bloom. In all these cases
the growth curve is
(a) sigmoid type
(b) oscillatory
(c) “J” shaped
(d) not of any definite shape or pattern
33. The maximum possible rate of increase of population of a given species under ideal conditions would depend
upon its
(a) biotic potential
(b) potential natality
(c) carrying capacity
(d) biomass
34. Apteryx is present only in
(a) India
(b) New Zealand
(c) Ireland
(d) Africa
35. The starfishes are:
(a) pelagic creatures
(b) lotic creatures
(c) abyssal creatures
(d) benthonic creatures
36. The biomass of one trophic level getting incorporated into the biomass of the next trophic level is the
(a) relative ratio of energy flow
(b) energy flow efficiency
(c) ecological efficiency
(d) ecological gradient
37. Skeletal structures of terrestrial animals are more elaborate than that of aquatic vertebrates because
(a) air is more mobile than water
(b) water contains more nutrients than air
(c) movement is much easier in air than in water
(d) density of water is much greater than that of air
38. Which one of the following not a cause leading to the endangered status of a species?
(a) Destruction of habitat
(b) Environmental pollution
(c) Unregulated commercial exploitation
(d) Migration
39. Which one of the following statements is a scientifically meaningful explanation of circadian rhythm?
(a) The behaviour of an organism is conditioned by internal physiological readiness and capacities of various sorts
but it does not fluctuate rhythmically in response to external stimuli
(b) The behaviour of an organism in its natural environment is a response to external stimuli alone and fluctuates
rhythmically
(c) The behaviour of an organism in its natural environment is a response to external stimuli and is conditioned by
internal physiological readiness and capacities of various sorts. Both external environment and internal -readiness
fluctuate rhythmically and at specific intervals
(d) The behaviour of an organism in its natural environment is a response to external stimuli and is conditioned by
internal physiological readiness and capacities of various sorts. But the external environment and internal readiness
fail to fluctuate rhythmically at intervals
40. Biological Oxygen Demand refers to the amount of oxygen required to
(a) Break down the organic materials
(b) synthesis organic compounds
(c) convert inorganic materials to their oxides and cause their precipitation
(d) facilitate respiration
41. Match list-I (Animals) with list-II (Their realm) and select the correct answer using the codes given below the lists
List-I List-II
A. Protopterus 1. Australian
B. Opossum 2. Ethiopian
C. Sphenodon 3. Nearctic
D. Prehensile tailed monkey 4. Neotropical
Codes:
A B C D
(a) 2 3 1 4
(b) 2 1 3 4
(c) 4 1 3 2
(d) 4 3 1 2
42. The animals inhabiting grass land ecosystem are characterized by
(a) good sight
(b) capacity to mimic
(c) swift locomotion
(d) acute sense of smell
43. “Ecotone “is best described as the
(a) state of equilibrium among various trophic levels in an ecosystem
(b) potentiality of an animal to adjust to new circumstances
(c) transition between two or more diverse communities
(d) maximum biomass an ecosystem can support
44. Which one of the following chemicals is not related to biological magnification?
(a) Chlorinated hydrocarbon
(b) Heavy metal
(c) Organophosphates
(d) Polychlorinated biphenyls
45. At which one of the following trophic level is DDT sprayed to control insect pests of crops?
(a) Primary producers
(b) Primary consumers
(c) Secondary consumers
(d) Tertiary consumers
46. “Parasitic flies are often more-important enemies of insect than are the Hymenoptera. Tachina fly has a large
variety of caterpillar hosts and usually succeeds in keeping several of them under complete subjugation.”
The above statement clearly establishes association between Tachina fly and caterpillars. Keeping in view the type of
mouth parts available in the order Diptera, the fly-caterpillar association is established through
(a) Ectoparasitism
(b) Endoparasitism
(c) Predation
(d) Oviposition
47. Which of the following pair is correctly matched?
(a) Saprozoic — Synthesize food with chlorophyll
(b) Symbiotic — Lives completely on other organisms
(c) Holozoic — feeds on other organisms
(d) Holophytic — sucks the blood of the host
48. With the increasing use of DDT, the number of DDT resistant mosquitoes has increased to a great extent. In the
middle of the present century, their number was insignificant, but now they constitute the major portion of mosquito
population in India.
The type of selection operating in this situation is:
(a) Lamarckian selection
(b) Natural selection
(c) Disruptive selection
(d) Artificial selection
49. Which one of the following sets of environmental factors refers to the only density dependent factors?
(a) Temperature, food, disease, light
(b) Food, predation, disease, accumulation of metabolites
(c) Temperature, salinity, predation, disease
(d) Food, salinity, accumulation of metabolites, light
50. Consider the following organism:
(i) Pheretima
(ii) Calanus
(iii) Shark
(iv) Herring
The correct sequence of arrangement of the organisms in order of their trophic levels is—
(a) i, ii, iv, iii
(b) ii, i, iv, iii
(c) i, ii, iii, iv
(d) ii, i, iii, iv