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12th Standard Bio-Zoology English Medium Organisms and Populations Reduced Syllabus Important Questions 2021

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. Which of the following is an r-species

    (a)

    Human

    (b)

    Insects

    (c)

    Rhinoceros

    (d)

    Whale

  2. Match the following and choose the correct combination from the options given below.

    Column I Column II
    A. Mutalism 1. Lion and deer
    B. Commensalism 2. Round worm and man
    C. Parasitism 3. Birds compete with squirrels for nuts
    D. Competition 4. Sea anemone on hermit crab
    E. Predation 5. Bernacles attached to Whales.

     

    (a)

    A- 4, B-5, C-2, D –3, E-1

    (b)

    A- 3, B-1, C-4, D – 2, E-5

    (c)

    A- 2, B-3, C-1, D – 5, E-4

    (d)

    A- 5, B-4, C-2, D – 3, E-1

  3. Which of the following is correct for r-selected species

    (a)

    Large number of progeny with small size

    (b)

    large number of progeny with large size

    (c)

    small number of progeny with small size

    (d)

    small number of progeny with large size

  4. Animals that can move from fresh water to sea called as______

    (a)

    Stenothermal

    (b)

    Eurythermal

    (c)

    Catadromous

    (d)

    Anadromous

  5. "Birds and mammals attain greater body size in colder regions than warmer regions." - Choose the correct option.

    (a)

    Bergmann's rule

    (b)

    Jordon's rule

    (c)

    Sewall wright effect

    (d)

    Allen's rule

  6. Birds sitting on cows to eat insects is an example of ____________

    (a)

    Competition

    (b)

    Mutualism

    (c)

    Commensalism

    (d)

    Amensalism

  7. Nuts are eaten by birds and squirrels. This is an example of an interaction called _____________

    (a)

    Commensalism

    (b)

    Mutualism

    (c)

    Amensalism

    (d)

    Competition

  8. People who have migrated from the planes to an area adjoining Rohtang Pass about six months back

    (a)

    Have more RBC's and their haemoglobin has a lower binding affinity to O2

    (b)

    Are not physically fit to play games like football

    (c)

    Suffer from altitude sickness with symptoms like nausea, fatigue, etc.

    (d)

    Have the usual RBC count but then haemoglobin has very high binding affinity to O2.

  9. A biologist studies the population of eats in a barn. He found that the average natality was 250, average mortality is 240, immigration is 20 and emigration to be 30. The  in population is

    (a)

    10

    (b)

    15

    (c)

    05

    (d)

    Zero

  10. Identify the proper sequence in increasing order of population

    (a)

    Species ⟶ Population ⟶ Community ⟶ biome

    (b)

    Population ⟶ Community ⟶ Species ⟶ biome

    (c)

    Biome ⟶ Species ⟶ Community ⟶ Population

    (d)

    Community ⟶ Population ⟶ Biome ⟶ Species

  11. Functional status of an organism in its community is _______________

    (a)

    Biome

    (b)

    Niche

    (c)

    Species

    (d)

    Population

  12. Assertion (A): Snake is a stenotherm.
    Reason (R): Organism can tolerate narrow temperature fluctuations

    (a)

    Both A and R are correct R explain A

    (b)

    A is correct R is incorrect

    (c)

    R does not explain A

    (d)

    Both A and R are incorrect

  13. Assertion (A): Diapause is carried out to overcome abiotic stress.
    Reason (R): Animals become inactive during winter.

    (a)

    Both A and R are correct R explain A

    (b)

    A is correct R is incorrect

    (c)

    R does not explain A

    (d)

    Both A and R are incorrect

  14. Maximum reproductive capacity of an organism under favorable condition is referred to as_______________

    (a)

    Carrying capacity

    (b)

    Biotic potential

    (c)

    Natality

    (d)

    Fecundity

  15. As altitude increases _____________

    (a)

    O2 density increases

    (b)

    Precipitation decreases

    (c)

    Temperature increases

    (d)

    Snowing decreases

  16. 2 Marks

    10 x 2 = 20
  17. What is Acclimatisation?

  18. What is Zero Stress?

  19. Differentiate between Eurytherms and Stenotherms.

  20. State Bergmann's rule.

  21. What is Ethology?

  22. Name the physiological adaptations seen in animals.

  23. Name the types of migration in fishes.

  24. Which is the largest biome on Earth? Classify it

  25. What is a forest? Name the major forest biomes.

  26. How the cold deserts are characterized? Give an example.

  27. 3 Marks

    10 x 3 = 30
  28. Differentiate Natality and Mortality

  29. Give an account of population regulation

  30. Draw a diagram to show age distribution in a increasing population.

  31. Draw a sketch to show J and S shaped growth form of a population.

  32. List some adaptations seen in animals to overcome extreme winters and summers

  33. What is phototaxis?

  34. Define migration.

  35. Define the terms (a) guilds (b) ecological equivalents

  36. Define temperature. How it impacts the life of an organism?

  37. Name the kind of interaction in the following pairs.
    (a) Shark and Suckerfish
    (b) Cat and Rat
    (c) Lion and Deer

  38. 5 Marks

    7 x 5 = 35
  39. Give an account of the properties of soil.

  40. List the adaptations seen in terrestrial animals

  41. Describe Growth Models/Curves.

  42. List the adaptations of aquatic animals.

  43. Write a note on grassland biome.

  44. Explain structural and behavioural adaptations seen in organism.

  45. Rainfall shortage affects the normal lift In desert biome scanty rainfall occurs. Bm many organisms are living there. Discuss ~ characteristics of desert biomes.

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