NEET Class 12 Biology MCQ

Test your knowledge with important NEET Class 12 Biology MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more NEET Class 12 Biology MCQs at Bissoy

• What is the reason for the increase in the BOD?
  ক

  Planting trees

  খ

  Collecting of sewage water

  গ

  Dumping of sewage in the water

  ঘ

  Cleaning of water
• How much amount of dissolved oxygen does gravely polluted water consists of?
  ক

  20 ppm

  খ

  8 ppm

  গ

  Above 4 ppm

  ঘ

  Below 4 ppm
• What amount of BOD indicates low water pollution?
  ক

  4000mg/liter

  খ

  1500mg/liter

  গ

  2000mg/liter

  ঘ

  15000mg/liter
• What amount of BOD indicates high water pollution?
  ক

  4000mg/liter

  খ

  400mg/liter

  গ

  40mg/liter

  ঘ

  4mg/liter
• What should be the amount of BOD in the drinking water?
  ক

  More than 1 ppm

  খ

  Less than 1 ppm

  গ

  5 ppm

  ঘ

  10 ppm
• What would happen if the Western Ghats ecosystems are less functional?
  ক

  No harm to the ecosystem function

  খ

  Ecosystem function is not changed

  গ

  Ecosystem function is the same

  ঘ

  Ecosystem is damaged
• What will happen if instead of 20,000 we have 100,000 species of frogs on Earth?
  ক

  Little threat to the ecosystem

  খ

  Serious threat to the safety of the ecosystem

  গ

  Ecosystem remains unchanged

  ঘ

  No threat to the ecosystem
• What will happen if instead of 20,000 we have only 15,000 species of birds on Earth?
  ক

  No threat to the ecosystem

  খ

  Little threat to the ecosystem

  গ

  Serious threat to the safety of the ecosystem

  ঘ

  Ecosystem remains unchanged
• What will happen if key species that drive major ecosystem functions are lost?
  ক

  No threat to the ecosystem

  খ

  Serious threat to the safety of the ecosystem

  গ

  Little threat to the ecosystem

  ঘ

  Ecosystem remains unchanged
• What is considered as the rivet in the ‘Rivet popper hypothesis’?
  ক

  Ecosystem

  খ

  Community

  গ

  Species

  ঘ

  Individual
• An ecosystem is joined by thousands of species, if a problem occurs causing a species to become extinct, it may not affect the proper functioning of the ecosystem initially, but as more and more species are removed, the ecosystem becomes dangerously weak over a period of time. Which hypothesis gave this sentence?
  ক

  Old planetesimal hypothesis

  খ

  Oparin-Haldane hypothesis

  গ

  New planetesimal hypothesis

  ঘ

  Rivet popper hypothesis
• Who gave the ‘Rivet popper hypothesis’?
  ক

  Karl Correns

  খ

  Robert Hooke

  গ

  Paul Ehrlich

  ঘ

  Louis Pasteur
• For what reason is rich biodiversity important?
  ক

  Community issues

  খ

  Ecosystem health

  গ

  Ecological issues

  ঘ

  Community problems
• What did David Tilman’s experimental plot show?
  ক

  More variation in productivity

  খ

  Fewer species showed less variation

  গ

  More variation from year-to-year in the total biomass

  ঘ

  More species showed less variation from year-to-year in the total biomass
• Which of the following is a feature of a stable community?
  ক

  Resistant or resilient to occasional disturbances

  খ

  More variation in productivity

  গ

  Susceptible to occasional disturbances

  ঘ

  Susceptible to invasions by alien species
• Which community should show less variation in productivity from year to year?
  ক

  Dynamic community

  খ

  Sable community

  গ

  Unstable community

  ঘ

  Reproductive community
• Which of the following event occurs in an ecosystem?
  ক

  Unidirectional movement of energy

  খ

  Coupled process of cycling of energy and nutrients

  গ

  Independent cycling of energy

  ঘ

  Recycling of micro and micronutrients at the same speed
• Which of the following is the driving force of an ecosystem?
  ক

  Biomass

  খ

  Consumer

  গ

  Producer

  ঘ

  Solar energy
• Who forms the new organic matter giving rise to secondary productivity?
  ক

  Producer

  খ

  Consumer

  গ

  Scavenger

  ঘ

  Decomposer
• What is the energy stored at the consumer level called?
  ক

  Primary energy

  খ

  Tertiary energy

  গ

  Secondary productivity

  ঘ

  Net productivity
• What happens when the food energy passes from herbivores to carnivores and to the next organism?
  ক

  Amount of energy increases

  খ

  Amount of energy decreases

  গ

  Energy becomes zero

  ঘ

  Energy remains unchanged
• On what does the number of individuals in each trophic level depend on?
  ক

  Number of individuals at upper trophic level

  খ

  Number of individuals at top-most trophic level

  গ

  Number of individuals at lower trophic level

  ঘ

  Amount of sunlight reaching the Earth’s surface
• What is the trophic level of a lion in a forest ecosystem?
  ক

  T1

  খ

  T3

  গ

  T0

  ঘ

  T4
• Which of the following organisms contain the greatest amount of energy?
  ক

  Heterotrophs

  খ

  Decomposers

  গ

  Autotrophs

  ঘ

  Scavengers
• Which of the following phenomenon is responsible for the initiation of a food chain?
  ক

  Decomposition

  খ

  Respiration

  গ

  Fixation

  ঘ

  Photosynthesis
• In which of the following, organisms completely stop their metabolic activities?
  ক

  Hibernation

  খ

  Aestivation

  গ

  Death

  ঘ

  Diapause
• Which process do some snails and fishes undergo to prevent themselves from desiccation?
  ক

  Dormancy

  খ

  Migration

  গ

  Aestivation

  ঘ

  Hibernation
• What do the desert lizards do when their body temperature drops?
  ক

  They burrow in the sand

  খ

  They hide in the soil

  গ

  They move in a shady place

  ঘ

  They bask in the sun
• Which rule states that in a cold climate, mammals possess shorter ears and limbs to minimize the heat loss?
  ক

  Bergman’s rule

  খ

  Blackman’s rule

  গ

  Allen’s rule

  ঘ

  Lindeman’s rule
• The Siberian cranes migrate to which National Park in India?
  ক

  Kaziranga National Park, Assam

  খ

  Silent Valley National Park, Kerala

  গ

  Chikla Lake Bird Sanctuary, Orissa

  ঘ

  Keoladeo National Park, Rajasthan