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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
- (A) producers
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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| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |