Url copied to clipboard
Preparing pdf for download. It may take 2-3 mins to complete.

Organism And Population

Board » Bihar Board » Class 12th » English Medium » Science » Biology » L-13 : Organism And Population

Objective Questions (MCQs)

more info
Question

Online Test
Multiple Choice
Verified
ID- 10583
BSEB, 2019 (C)

1. A moss plant is unable to complete its life cycle in a dry environment due to:

  • (A) scarcity of water
  • (B) External fertilization
  • (C) Plenty of water
  • (D) None of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10585
BSEB, 2020 (A)

2. Which plant does not grow in hydrophytic environment?

  • (A) Hydrilla
  • (B) Trapa
  • (C) Nelumbo
  • (D) Acacia
Copy Question Link
Close
Multiple Choice
Verified
ID- 10586

3. Exponential population growth is:

  • (A) dN/dt = rN
  • (B) dt/dN = rN
  • (C) dN/rN = dt
  • (D) rN/dN = dt
Copy Question Link
Close
Multiple Choice
Verified
ID- 10589

4. A high density of elephant population in an area can be result in:

  • (A) Interspecific competition
  • (B) Intraspecific competition
  • (C) Mutualism
  • (D) Predation on the another
Copy Question Link
Close
Multiple Choice
Verified
ID- 10590

5. Geometric representation of age structure is a characteristic of:

  • (A) Landscape
  • (B) Ecosystem
  • (C) Biotic community
  • (D) Population
Copy Question Link
Close
Multiple Choice
Verified
ID- 10646
BSEB, 2019 (A)

6. Climax community is present in which area?

  • (A) In equilibrium
  • (B) In transition
  • (C) Bare land
  • (D) None of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10647

7. Allelopathy is due to secretion of:

  • (A) Pheromone
  • (B) Toxin
  • (C) Chemicals
  • (D) Poison
Copy Question Link
Close
Multiple Choice
Verified
ID- 10648

8. Root cap is deficient in:

  • (A) Hydrophytes
  • (B) Halophytes
  • (C) Xerophytes
  • (D) Heliophytes
Copy Question Link
Close
Multiple Choice
Verified
ID- 10649

9. Name the habitat in which decimal soil temperature vary most

  • (A) Forest
  • (B) Grassland
  • (C) Shrubland
  • (D) Desert
Copy Question Link
Close
Multiple Choice
Verified
ID- 10650

10. Which of the following forest plants control the light conditions at the ground?

  • (A) Lianas and Climbers
  • (B) Shrubs
  • (C) Tall trees
  • (D) Herbs
Copy Question Link
Close
Multiple Choice
Verified
ID- 10651

11. Salt concentration (Salinity) of the sea measured in parts per thousands is:

  • (A) 10-15
  • (B) 30-70
  • (C) 0-5
  • (D) 30-35
Copy Question Link
Close
Multiple Choice
Verified
ID- 10652

12. Which one of the following organisms reproduces sexually only once in its life time?

  • (A) Banana
  • (B) Mango
  • (C) Tomato
  • (D) Eucalyptus
Copy Question Link
Close
Multiple Choice
Verified
ID- 10653

13. "Theory of Human Population" was written by:

  • (A) Charles Darwin
  • (B) A.R. Wallace
  • (C) T.R. Malthus
  • (D) Lamarch
Copy Question Link
Close
Multiple Choice
Verified
ID- 10654
BSEB, 2015

14. Oviparious are:

  • (A) hen
  • (B) snake
  • (C) crocodile
  • (D) all of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10655

15. The maximum growth rate occurs in:

  • (A) Lag phase
  • (B) Exponential phase
  • (C) Stationary phase
  • (D) Senescent phase
Copy Question Link
Close
Multiple Choice
Verified
ID- 10656

16. Mycorrhiza is an example of:

  • (A) Decomposers
  • (B) Endoparasitism
  • (C) Symbiotic relationship
  • (D) Ectoparasitism
Copy Question Link
Close
Multiple Choice
Verified
ID- 10657

17. Plant growing in saline soil with high salt concentration are:

  • (A) Xerophytes
  • (B) Halophytes
  • (C) Heliophytes
  • (D) Hudrophytes
Copy Question Link
Close
Multiple Choice
Verified
ID- 10658

18. When birth are equal to deaths, it is:

  • (A) Plateau stage
  • (B) Exponential stage
  • (C) Early growth stage
  • (D) Acceleration stage
Copy Question Link
Close
Multiple Choice
Verified
ID- 10659

19. Which plant is found in mangrove zone?

  • (A) Rhizophora
  • (B) Acacia
  • (C) Pinus
  • (D) Tectona grandis
Copy Question Link
Close
Multiple Choice
Verified
ID- 10660

20. Soil transported by air is:

  • (A) Alluvial
  • (B) Glacial
  • (C) Colluvial
  • (D) Eolian/Aeolian soil
lightbulb_circle

EXPLANATION:

A. Alluvial is the soil transported by water.
B. Colluvial is the soil transported by gravity.
C. Glacial is the soil transported by glaciers.
D. Eolian is the soil transported by the blowing wind.

Therefore, option D is correct.

Copy Question Link
Close
Multiple Choice
Verified
ID- 10661

21. The branch of science which studies the interactions among organisms and between organisms and physical environment is called as:

  • (A) epidemiology
  • (B) ecology
  • (C) ethology
  • (D) etiology
Copy Question Link
Close
Multiple Choice
Verified
ID- 10662

22. A place has very scanty rainfall, the dominant plants there may be:

  • (A) Opuntia
  • (B) Nymphaea
  • (C) Asparagus
  • (D) both 'A' and 'C'
Copy Question Link
Close
Multiple Choice
Verified
ID- 10663

23. Which of the following algae are found in deepest ocean waters?

  • (A) Red algae
  • (B) Yellow algae
  • (C) Green algae
  • (D) Brown algae
Copy Question Link
Close
Multiple Choice
Verified
ID- 10664

24. Many animals use the diurnal and seasonal variations in light intensity and photoperiod to time their:

  • (A) migration
  • (B) reproductive activities
  • (C) suspension
  • (D) all of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10665

25. When organisms change their location to escape from harsh environment, it is called as:

  • (A) hibernation
  • (B) vernalization
  • (C) migration
  • (D) aestivation
Copy Question Link
Close
Multiple Choice
Verified
ID- 10666

26. Opuntia has spine like leaves which help in:

  • (A) reducing the rate of transpiration
  • (B) increasing the rate of transpiration
  • (C) increasing the rate of photosynthesis
  • (D) reducing the rate of photosynthesis
Copy Question Link
Close
Multiple Choice
Verified
ID- 10667

27. A behavioural strategy of adaptation called echolocation is found in:

  • (A) bats
  • (B) butterfly
  • (C) praying mantis
  • (D) arctic tern
Copy Question Link
Close
Multiple Choice
Verified
ID- 10668

28. Lichens are the associations of:

  • (A) bacteria and fungus
  • (B) algae and bacterium
  • (C) fungus and algae
  • (D) fungus and virus
Copy Question Link
Close
Multiple Choice
Verified
ID- 10669

29. Which of the following is a partial root parasite?

  • (A) Sandal wood
  • (B) Mistletoe
  • (C) Orobanche
  • (D) Ganoderma
Copy Question Link
Close
Multiple Choice
Verified
ID- 10670

30. If the age distribution is plotted for a population, the resulting structure is called as:

  • (A) age graph
  • (B) age curve
  • (C) age pyramid
  • (D) age diagram
Copy Question Link
Close
Multiple Choice
Verified
ID- 10808

31. Parameters related to age structure include:

  • (A) fecundity (birth rate)
  • (B) generation time
  • (C) death rate
  • (D) all of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10809

32. Which of the following factor has a negative effect on the population growth rate?

  • (A) Emigration
  • (B) Immigration
  • (C) Natality
  • (D) Fecundity
Copy Question Link
Close
Multiple Choice
Verified
ID- 10810

33. The maximum possible number of individuals that a habitat can support is called its:

  • (A) fecundity
  • (B) surviving ability
  • (C) carrying capacity
  • (D) biotic potential
Copy Question Link
Close
Multiple Choice
Verified
ID- 10811

34. An urn shaped population age pyramid represents:

  • (A) growing population
  • (B) static population
  • (C) declining population
  • (D) extinct population
Copy Question Link
Close
Multiple Choice
Verified
ID- 10812

35. The interdependent evolution of flowering plants and pollinating insect together is known as:

  • (A) mutualism
  • (B) coevolution
  • (C) commensalism
  • (D) cooperation
Copy Question Link
Close
Multiple Choice
Verified
ID- 10813

36. An interaction between two individuals where one is benefitted while the other is neither benefitted nor harmed is called as:

  • (A) predation
  • (B) symbiosis
  • (C) amensalism
  • (D) commensalism
Copy Question Link
Close
Multiple Choice
Verified
ID- 10814

37. Autecology is the:

  • (A) relation of heterogeneous population to its environment
  • (B) relation of a individual to its environment
  • (C) Both 'A' and 'B'
  • (D) relation of a biome to its environment
Copy Question Link
Close
Multiple Choice
Verified
ID- 10815

38. Ecotone is:

  • (A) a polluted area
  • (B) the bottom of lakes
  • (C) a zone of transition between two communities
  • (D) a zone of developing community
Copy Question Link
Close
Multiple Choice
Verified
ID- 10816

39. Biosphere is:

  • (A) component in the ecosystem
  • (B) composed of the plants present in the soil
  • (C) life in the outer space
  • (D) composed of all living organisms present on earth which interact with the physical environment
Copy Question Link
Close
Multiple Choice
Verified
ID- 10817

40. Ecological niche is:

  • (A) the surface area of the ocean
  • (B) an ecologically adapted zone
  • (C) the physical position and functional role of a spices within the community
  • (D) formed of all plants and animals living at the bottom of a lake
Copy Question Link
Close
Multiple Choice
Verified
ID- 10818

41. According to Allen's Rule, the mammals from colder climate have:

  • (A) shorter ears and longer limbs
  • (B) longer ears and shorter limbs
  • (C) longer ears and longer limbs
  • (D) shorter ears and shorter limbs
Copy Question Link
Close
Multiple Choice
Verified
ID- 10819

42. Salt concentration (salinity) of the sea measured in parts per thousand is:

  • (A) 10-5
  • (B) 30-70
  • (C) 0-5
  • (D) 30-35
Copy Question Link
Close
Multiple Choice
Verified
ID- 10820

43. Formation of tropical forests needs mean annual temperature and mean annual precipitation as:

  • (A) 18-25°C and 150-400 cm
  • (B) 5-15°C and 50-100 cm
  • (C) 30-50°C and 100-150 cm
  • (D) 5-15°C and 100-200 cm
Copy Question Link
Close
Multiple Choice
Verified
ID- 10821

44. If a population of 50 Paramecium present in a pool increases to 150 after an hour, what would be the growth rate of population?

  • (A) 50 per hour
  • (B) 200 per hour
  • (C) 5 per hour
  • (D) 100 per hour
Copy Question Link
Close
Multiple Choice
Verified
ID- 10822

45. What parameters are used for tiger census in our country's national parks and sanctuaries?

  • (A) Pug marks only
  • (B) Pug marks and faecal pellets
  • (C) Faecal pellets only
  • (D) Actual head counts
Copy Question Link
Close
Multiple Choice
Verified
ID- 10823

46. Which of the following would necessarily decrease the density of a population in a given habitat?

  • (A) Natality > mortality
  • (B) Immigration > emigration
  • (C) Mortality and emigration
  • (D) natality and immigration
Copy Question Link
Close
Multiple Choice
Verified
ID- 10824

47. A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

  • (A) 128
  • (B) 24
  • (C) 64
  • (D) 32
Copy Question Link
Close
Multiple Choice
Verified
ID- 10825

48. Amensalism is a association between two species where:

  • (A) one spices is harmed and other is benefitted
  • (B) one spices is harmed and other is umaffected
  • (C) one species is benefitted and other is unaffected
  • (D) both the species are harmed
Copy Question Link
Close
Multiple Choice
Verified
ID- 10826
BSEB, 2016

49. Hermaphrodite organism is:

  • (A) hen
  • (B) snake
  • (C) both 'A' and 'B'
  • (D) earthworm
Copy Question Link
Close
Multiple Choice
Verified
ID- 10827
BSEB, 2016 (C)

50. Locust is:

  • (A) Producer
  • (B) Primary consumer
  • (C) 'A' and 'B' both
  • (D) None of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10828
BSEB, 2017 (A), 2017 (C)

51. Population explosion results in:

  • (A) Reproduction in Income
  • (B) Reproduction in land
  • (C) Reproduction in Minerals
  • (D) All of these
Copy Question Link
Close
Multiple Choice
Verified
ID- 10829
BSEB, 2018 (A)

52. Appearance of antibiotic resistance bacteria is an example of:

  • (A) Adaptive radiation
  • (B) Transduction
  • (C) Pre existing variation
  • (D) Divergent evolution
Copy Question Link
Close