12th Biology chapter 13: full solution, notes, MCQ, & free PDF | Bihar board

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12th Biology chapter 13: cover all important question with new latest pattern. you can download Biology chapter 13 notes & full solution as PDF format in English. below we are goin to cover chapter 13 Biology class 12 Bihar board
Bihar board Biology chapter 13 class 12: specially we focused on Bihar board latest pattern of Biology, and on this post covered class 12th Biology chapter 13 based on Bihar board. check out below to get full solutions of Biology chapter 13 class 12 Bihar board.

12th Biology chapter 13 Bihar board with NCERT-Details & Highlights

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content Biology objective type MCQ question with answer
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important for exam Bihar board & other state board
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12th Biology chapter 13 all objective solutions – download PDF

 1. Growing skin cancer and high mutation rate are due to
    • (A) Acid rain
    • (B) depletion of ozone layer
    • (C) CO pollution
    • (D) CO, pollution
  Answer: (B) depletion of ozone layer
2. Which of the following is not a green house gas?
    • (A) Methane
    • (B) Chlorofluorocarbons
    • (C) CO,
    • (D) Nitrogen
 Answer: (D) Nitrogen
3. Which of the following is a Green House Gas?
    • (A) Methane
    • (B) Carbon dioxide
    • (C) Valurofluorocarbons
    • (D) all of these
Answer: (D) All of these
4. Which of the following is an insectivorous plant?
    • (A) Drosera
    • (B) Nepenthes
    • (C) Both ‘ A ‘ and ‘ B ‘
    • (D) Hydrilla
 Answer: (C) Both ‘A’ and ‘B’
5. Lichen is indicative
    •  (A) CO2 pollution
    • (B) SO2 pollution
    • (C) CO pollution
    • (D) water pollution
Answer: (B) SO2 pollution
6. The standard of noise pollution by the World Health Organization (WHO) is
    • (A) 20-30 decibels
    • (B) 45 decibels
    • (C) 75 decibels
    • (D) 90 decibels
Answer: (A) 20-30 decibels
7. Which of these plants is a hydrophyte?
    • (A) Singhada
    • (B) Hawthorn
    • (C) rosewood
    • (D) Acacia
 Answer: (A) Singhada
8. World Environment Day is celebrated on
    • (A) On December 6
    • (B) On June 5
    • (C) On January 6
    • (D) none of these
 Answer: (B) On 5th June
9. Which of these plants is a hydrophyte?
    • (A) Lime
    • (B) lotus
    • (C) Singhada
    • (D) all
Answer: (D) All
10. By which instrument is the wind velocity measured?
    • (A) Anemometer
    • (B) Hydrometer
    • (C) Lactometer
    • (D) Photometer
 Answer: (A) Anemometer

most important mcq solution 12th biology chapter 13

11. Due to excessive leaching, Fe and A rich soil is called
    • (A) laterite
    • (B) decomposers
    • (C) mortal
    • (D) heterotroph
Answer: (A) Laterite
12. The nature of an inhabitant depends on
    • (A) Distribution
    • (B) Density
    • (C) Ethnic composition
    •  (D) all of the above
 Answer: (D) All of the above
13. Due to which reasons the population is always changing?
    • (A) Physical
    • (B) organic
    • (C) Both ‘ A ‘ and ‘ B ‘
    • (D) none of these
 Answer: (C) Both A’ and ‘B’
14. Why inter-species interbreeding cannot be possible between two different species in nature?
    • (A) Due to biological constraints
    • (B) Due to environmental constraints
    • (C) Due to both types of obstacles
    • (D) none of these
Answer: (C) Due to both types of obstacles
15. Ozone level is found in
    • (A) Troposphere
    • (B) exosphere
    • (C) Mesosphere
    • (D) Stratosphere
Answer: (D) Stratosphere
16. The depletion of ozone layer is due to
    • (A) Carbon dioxide
    • (B) Chlorofluorocarbons
    • (C) Both ‘ A ‘ and ‘ B ‘
    • (D) none of these
 Answer: (B) Chlorofluorocarbons
 17. The residence having the working area of ​​a caste is made of
    • (A) Topography
    • (B) Nutrition level
    • (C) Boundary
    • (D) Environmental Niket
Answer: (D) Environmental Niket
18. The maximum growth rate is found in
    • (A) in leg position
    • (B) In the exponential state
    • (C) in steady state
    • (D) in the senescent state
Answer: (B) In the exponential state
19. Nick is Orvalp
    • (A) Co-operation between two castes
    • (B) Active co-operation between two species
    • (C) two different parasites in the same food
    • (D) resource sharing from two species
Answer: (D) Resource sharing from two species
 20. The larger size of the outer ear in the animals of the warmer parts as compared to the animals of the cold parts is due to
    • (A) Daily’s rule
    • (B) Gloger’s law
    • (C) Coop’s law
    • (D) Allen’s principle
Answer: (D) Allen’s principle

Important most mcq solution 12th biology chapter 13

21. The area of ​​the atmosphere near the earth is called
    • (A) Stratosphere
    • (B) Mesosphere
    • (C) Troposphere
    • (D) Thermosphere
Answer: (C) Troposphere
 22. Which chemical in this helps in establishing communication between the living organisms?
    • (A) Tylin
    • (B) Enzyme
    •  (C) Pheromones
    • (D) none of these
Answer: (C) Pheromones
23. The scraping of an organism according to its external environment is an example of
    • (A) Symmetry
    • (B) homogeneity
    • (C) Adaptation
    • (D) Caste formation
Answer: (C) Adaptation
24. Soil which is transported by air is called what?
    • (A) Colubial
    • (B) Aeolian
    • (C) Alluvial
    • (D) Glacial
Answer: (B) Aeolian
25. What is the main reason for the extinction of some species in tropical forests?
    • (A) Forestation
    • (B) Afforestation
    • (C) Pollution
    • (D) soil erosion
Answer: (b) Afforestation
26. The presence of biodiversity at the junction of territories of two different habitats is called
    • (A) Bottle neck effect
    • (B) ‘Edge Effect’
    • (C) Treaty location effect
    • (D) Pasteur effect
 Answer: (A) Bottle neck effect
27. A small fish sticks to the base of the shark and gets food from it. This connection is called
    • (A) Survival
    • (B) sharing
    • (C) Predation
    • (D) Parasitism
 Answer: (B) Sharing
28. What can be the result of high concentration of elephant population in an area?
    • (A) Co-operation
    • (B) Interracial competition
    • (C) Interracial competition
    • (D) predating each other
 Answer: (C) Interracial competition
 29. Animals become inactive during winter is called
    • (A) Air-conditioning
    • (B) hibernation
    • (C) Summer inactivity
    • (D) Adaptation
Ans: (B) Cold inactivity
30. Praying Matisse is a good example,
    • (A) Camoplang
    • (B) Mularian mimicry
    • (C) Banning Coloration
    • (D) social insect
Answer: (A) Camoplang

12th biology chapter 13 mcq solution bihar board 

31. In the soil profile, smog is present
    • (A) in level 0
    • (B) in A level
    • (C) in B level
    • (D) in C level
Answer: (B) In A Level
32. Which of the following soil is best for agriculture?
    • (A) clay soil
    • (B) Silt
    • (C) Mixture of loam with silt and clay
    • (D) loamy soil
 Answer: (D) Loamy Soil
33. In which year the Environment Protection Act came into force?
    • ( A ) 1986
    • ( B ) 1989
    • ( C ) 1982
    • ( D ) 1992
 Answer: (D) 1922
 34. 11th July is celebrated on
    • (A) World Population Day
    • (B) Tobacco Prohibition Day
    • (C) World Environment Day
    • (D) World Health Day
Answer: (A) World Population Day
 35. Lichen is a grouping of
    • (A) Algae and Algae
    • (B) Algae and Fungi
    • (C) roots of algae and higher plants
    • (D) Fungi and Fungi
Answer: (B) Algae and Fungi
36. The factors related to the nature and behavior of the earth’s surface are
    • (A) Mrideep
    • (B) Topographic
    • (C) role
    • (D) Geographic
 Ans: (B) Topographic
37. Which of the following use inorganic substances
    • (A) autotrophs
    • (B) decomposers
    • (C) dead parasite
    • (D) heterotroph
Answer: (A) Autotrophs
 38. The study of human population is called
    • (A) Psychology
    • (B) Demography
    • (C) Biography
    • (D) Calography
 Answer: (B) Demography
39. Insectivorous plants eat insects
    • (A) for meat
    • (B) for oxygen
    • (C) minerals
    • (D) Nitrogen
 Answer: (D) Nitrogen
40. Whose vowel is of high pitch (swarman)
    • (A) male
    • (B) woman
    • (C) Shemale
    • (D) none of these
Answer: (B) Female

BSEB 12th biology chapter 13 most objective solution

41. Science that links genetics to environment
    • (A) Ecology
    • (B) Peripherals
    • (C) Geology
    • (D) Genetics
Answer: (C) Geology
42. The leaves of aquatic plants are torn
    • (A) to reduce the surface area
    • (B) to increase the surface area
    • (C) to reduce the effect of water currents
    • (D) to increase the number of stomata
Answer: (C) To reduce the effect of water currents
43. Which of the following is the most harmful gas?
    • (A) Carbon Monoxide
    • (B) Sulfur dioxide
    • (C) Nights oxide
    • (D) none of these
 Answer: (A) Carbon Monoxide
 44. Which of the following is a green house gas
    • (A) Carbon dioxide
    • (B) Methane
    • (C) C – F.C.
    • (D) all of the above
Answer: (B) Methane
45. Plants which grow on rocks are called
    • (A) Oxelophyte
    • (B) Lithophyte
    • (C) eriophyte
    • (D) Halophyte
Answer: (B) Lithophyte
46. ​​An organism has to be killed and eaten
    • (A) Parasitism
    • (B) destruction
    • (C) Predator
    • (D) Symbiotic
 Answer: (C) Predator
47. Humans can normally tolerate sound intensity
    • (A) 20-30 decibels
    • (B) 80-90 decibels
    • (C) 120-130 decibels
    • (D) 140-150 decibels
Answer: (A) 20-30 decibels
48. The biological concept of caste is mainly based on
    • (A) on genetic isolation
    • (B) only on morphological features
    • (C) only on the method of reproduction
    • (D) on morphology and methods of reproduction
 Answer: (C) only on the method of reproduction
49. Unreversed reproductive capacity is called
    • (A) Birth rate
    • (B) Bio potential
    • (C) Carrying Capacity
    • (D) Fertility
Ans: (B) Bio potential
50. Pneumatophores are commonly found in
    • (A) in the dead
    • (B) in hydrophytes
    • (C) Mesophytes
    • (D) in saline rifts
Answer: (D) in saline rifts
51. Geometrical representation of age is a characteristic of
    • (A) Population
    • (B) landslide
    • (C) ecosystem community
    • (D) Bio
 Answer: (A) Population

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