12th Biology chapter 14: full solution, notes, MCQ, & free PDF | Bihar board

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12th Biology chapter 14: cover all important question with new latest pattern. you can download Biology chapter 14 notes & full solution as PDF format in English. below we are goin to cover chapter 14 Biology class 12 Bihar board
Bihar board Biology chapter 14 class 12: specially we focused on Bihar board latest pattern of Biology, and on this post covered class 12th Biology chapter 14 based on Bihar board. check out below to get full solutions of Biology chapter 14 class 12 Bihar board.

12th Biology chapter 14 Bihar board with NCERT-Details & Highlights

name of content 12th Biology chapter 14 full solution
content Biology objective type MCQ question with answer
name of subjects  class 12 Biology
important for exam Bihar board & other state board
pattern & Level  NCERT & State level question

12th Biology chapter 14 all objective solutions – download PDF

1. Green plants in an ecosystem are
    • (A) producers
      (B) consumers
      (C) decomposers
      (D) none of these
 Answer: (A) Producer
2. Which of the following food chain is correct?
    • (A) Grass, Wheat and Mango
    • (B) Grass, Goat and Lion
    • (C) Goat, Cow and Grass
    • (D) Grass, fish and goat
Answer: (B) Grass, Goat and Lion
3. Name the term ecosystem
    •  (A) Morgan
    • (B) a. Yes . tansley
    • (C) Lamarck
    • (D) none
 Answer: (B) A. Yes . tansley
4. is a bisexual animal
    • (A) Chicken
    • (B) snake
    • (C) Both ‘ A ‘ and ‘ B ‘
    • (D) earthworm
Answer: (D) Earthworm
5. Which of the following animals is not a hermaphrodite
    • (A) Leech
    • (B) earthworm
    • (C) tapeworm
    • (D) House fly
 Answer: (D) House fly
6. What is Tiha?
    • (A) Producer
    • (B) primary consumer
    • (C) both
    • (D) none of these
Ans: (B) Primary consumer
7. Wagh is a consumer
    • (A) First class
    • (B) Second class
    • (C) Class III
    • (D) none of these
Answer: (B) Second class
8. Energy flows in the food chain in an ecosystem
    • (A) one-way
    • (B) bidirectional
    • (C) Multidirectional
    • (D) all of these
Answer: (A) One Direction
9. The main source of energy in the ecosystem is
    • (A) green plants
    • (B) Sun
    • (C) Air
    • (D) all
Answer: (B) Sun
10. The cold dormancy that occurs in some animals is
    • (A) rhythmic
    • (B) topical
    • (C) Probably
    • (D) momentary
Answer: (A) Rhythmic

most important mcq solution 12th biology chapter 14

11. Under what are the physical and chemical characteristics of soils studied?
    • (A) Climate factor
    • (B) Bio factor
    • (C) Soil Factors
    • (D) Hopographic factor
Answer: (B) Bio-factors
12. What is the reduction in energy transfer from vegetarian to non-vegetarian level?
    • ( A ) 5 %
    • ( B ) 10 %
    • ( C ) 20 %
    • ( D ) 30 %
 Answer: (B)10%
13. Who first proposed the ecological pyramid?
    • (A) Charles Elton
    • (B) R. Hees
    • (C) R – A – Lindemann
    • (D) J-V. Living by
Answer: (A) Charles Elton
14. Which ecosystem has the highest successful primary productivity?
    • (A) Grassland
    • (B) mangroves
    • (C) Coral Reef
    • (D) Rain Forest
Answer: (B) Mangroves
15. Mark the odd thing
    • (A) Pistia
    • (B) Hydilla
    • (C) Vallisnorrhea
    • (D) Casuarina
 Answer: (D) Casuarina
16. discovered bacteria
    • (A) Mangroves
    • (B) Leuwenhoek
    • (C) Pasteur
    • (D) none of these
Answer: (B) Leuvenhook
17. Which one of the following does not participate in the formation of ecological pyramids?
    • (A) dry weight
    • (B) Number of individuals
    • (C) rate of energy flow
    • (D) fresh load
Answer: (D) Fresh Weight
18. The main reason for the extinction of some species in tropical forests is
    • (A) Forestation
    • (B) aforestation
    • (C) Pollution
    • (D) Soil Erosine
Answer: (B) Aforestation
19. Pyramid of energy is
    • (A) always inverted
    • (B) always straight
    • (C) both inverted and upright
    • (D) none of these
Answer: (B) Always upright
20. The largest collector of sulfur is
    • (A) Atmosphere
    • (B) rocks
    • (C) Ocean
    • (D) none of these
 Answer: (B) Rocks
21. Soil development takes place due to embracing of rocky surface.
    • (A) Force Science
    • (B) Ideology
    • (C) Pedo genesis
    • (D all of the above
Answer: (C) .Pedo Genesis

Important most mcq solution 12th biology chapter 14

22. Animals of cold region are small extremites, it is
    • (A) Allen’s law
    • (B) Classmen’s rule
    • (C) Delo’s rule
    • (D) Cope’s law
  Answer: (D) Cope’s law
23. Which does not have the original ROM?
    • (A) hydrophyte
    • (B) saline physique
    • (C) topography
    • (D) Heliophyte
Answer: (A) Hydrophytes
24. A hydrocephalus is
    • (A) Cape Paris
    • (B) Aprav
    • (C) Acacia
    • (D) Heparix
  Answer: (B) Aprav
25. Soil carried by gravity is
    • (A) Saluvial
    • (B) ascites
    • (C) Glacier
    • (D) Minod
Answer: (D) Minod
26. The junction of territories of two different habitats shows the presence of biodiversity at the site of
    • (A) wattle neck effect
    • (B) Edge effect
    • (C) Treaty location effect
    • (D) Pasteur effect
 Answer: (B) Edge Effect
27. The succession in the secondary naked region is called
    • (A) Primosear
    • (B) Subseer
    • (C) Marukamak
    • (D) none of these
Answer: (B) Subseer
28. What will happen if the decomposers are destroyed from an ecosystem?
    • (A) the flow of energy will stop
    • (B) the flow of minerals will stop
    • (C) the rate of decomposition will increase
    • (D) the process of photosynthesis will stop
Answer: (B) The flow of minerals will stop
29. Which one of the following statements about the pyramid of energy is false, while all other statements are true?
    • (A) It represents the energy of organisms at different trophic levels
    • (B) It is inverted in the figure
    • (C) it is straight in the figure
    • (D) Its base is wide
 Answer: (B) It is inverted in the figure
30. The most diverse organism in an ecosystem is
    • (A) Producer
    • (B) Consumer
    • (C) decomposers
    • (D) non-vegetarian
 Answer: (C) Decomposers
31. What is the pyramid of energy in an aquatic ecosystem?
    • (A) always straight
    • (B) always in reverse
    • (C) bell shaped
    • (D) none of these
 Answer: (A) Always straight
32. Energy transferred from one nutrient level to another nutrient level is
    • ( A ) 5 %
    • ( B ) 10 %
    • ( C ) 15 %
    • ( D ) 20 %
 Answer: (B)10%

12th biology chapter 14 mcq solution bihar board 

33. decomposers are
    • (A) self
    • (B) autotrophs
    • (C) Organotroph
    • (D) host
 Ans: (B) Self-sustaining
34. Which ecosystem has the highest primary productivity?
    • (A) Pond
    • (B) ocean
    • (C) Desert
    • (D) Forest
Answer: (D) Forest
35. In an ecosystem
    • (A) Primary producers are larger than primary consumers
    • (B) Primary consumers are larger than primary producers
    • (C) Primary consumers are larger than secondary consumers
    • (D) Secondary consumers are larger than primary consumers
 Answer: (D) Secondary consumers are larger than primary consumers
36. Stratification is found
    • (A) in the desert
    • (B) in tropical forest
    • (C) in deciduous forest
    • (D) in the tundra
Answer: (B) Tropical forest
37. The biological component in an ecosystem is
    • (A) Producer
    • (B) Consumer
    • (C) Disintegrator
    • (D) all of the above
Answer: (D) All of the above
38. By whom does water exchange take place in submerged plants?
    • (A) stomata
    • (B) Normal surface
    • (C) Hydethode
    • (D) lenticel
 Answer: (B) Normal surface
39. The hydrophyte with submerged root is
    • (A) Uticularia
    • (B) Trepa
    • (C) Nymphaea
    • (D) Bellisneria
 Answer: (D) Bellisneria
40. Xerophytes keep
    • (A) deep roots
    • (B) hidden stomata
    • (C) thick cuticle
    • (D) all of the above
Answer: (D) All of the above
41. The exchange of gases in the submerged alluvium takes place with
    • (A) from water bodies
    • (B) from Vatrannas
    • (C) Stomata
    • (D) normal surface
 Answer: (D) from the normal surface
42. Biological factors refer to
    • (A) Gas produced by industries
    • (B) Nutritious low soils
    • (C) living organisms
    • (D) fossil fuels
Answer: (C) Living organisms
43. The ecosystem represented by pond is
    • (A) Lentic
    • (B) lotik
    •  (C) fuel
    • (D) benthic
Answer: (A) Lentic

BSEB 12th biology chapter 14 most objective solution

44. Animals that live on the sea floor are called
    • (A) lentic
    • (B) Pelagic
    • (C) Venthik
    • (D) lotik
 Answer: (C) Venthik
45. Which of the following human activities is least harmful to the ecosystem?
    • (A) Organic Farming Firm
    • (B) Migratory agriculture
    • (C) Urban expansion
    • (D) Cultivation of gene modified plants
 Answer: (A) Organic Farming Firm
46. ​​Which of the following is not used in making ecological pyramids?
    • (A) dry weight
    • (B) Number of individuals
    • (C) rate of energy flow
    • (D) fresh load
Answer: (D) Fresh Weight
47. What does the Niche (Niket) interrelationship tell?
    • (A) Active collaboration between two species
    • (B) presence of two different parasites on the same host
    • (C) sharing of one or more resources between two species
    • (D) mutual affinity between two species
 Answer: (B) Occurrence of two different parasites on the same host
48. Which of the following is a bio-fertilizer?
    • (A) Cyanobacteria
    • (B) Virus
    • (C) Virobhoji
    • (D) all of the above
Answer: (A) Cyanobacteria
49. What fixes atmospheric nitrogen?
    • (A) Cyanobacteria
    • (B) Algae
    • (C) Virus
    • (D) none of these
Answer: (A) Cyanobacteria
50. Atmospheric humidity is measured by?
    • (A) Oxenometer
    • (B) Hygrometer
    • (C) Photometer
    • (D) potometer
Answer: (B) Hygrometer
51. Soil water available to plant roots is
    • (A) cell water
    • (B) surface water
    • (C) moisture water
    • (D) gravity water
  Answer: (D) Gravity Water
52. Shola forests are found in
    • (A) East Coast of Orissa
    • (B) in the North Eastern Himalayas
    • (C) Western Ghats (Kerala)
    • (D) Plateau of the South
Answer: (C) Western Ghats (Kerala)
53. A frog that eats herbivorous insects is
    • (A) primary consumer
    • (B) Secondary consumer
    • (C) Tertiary Consumer
    • (D) top carnivore
Ans: (B) Secondary consumer
54. Forest stage represents which of the following ecological stage?
    • (A) extreme state
    • (B) Mountainous conditions
    • (C) Vegetative condition
    • (D) none of these
Answer: (A) Extreme state
 55. The controlling factor in an ecosystem is
    • (A) soil moisture
    • (B) food
    • (C) to hunt
    • (D) heat
 Answer: (C) hunting

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