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

12th Standard

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Biology

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

    Multiple Choice Questions

    15 x 1 = 15
  1. The interaction in nature, where one gets benefit on the expense of other is...

    (a)

    Predation

    (b)

    Mutualism

    (c)

    Amensalism

    (d)

    Commensalism

  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. The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.

    (a)
    A B C
    Conformer Regulator Partial Regulator
    (b)
       A     B     C
    Regulatorr Partial Regulator Conformer
    (c)
    A B C
    Partial Regulatorr Regulator Conformer
    (d)
    A B C
    Regulatorr Conformerr Partial Regulatorr
  4. 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

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

    (a)

    Commensalism

    (b)

    Mutualism

    (c)

    Amensalism

    (d)

    Competition

  6. Study the four statements (1 to 4) given below and select the two correct ones out of them.
    1) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.
    2) Predator starfish Pisaster helps in maintaining species diversity of some invertebrates.
    3) Predators ultimately lead to the extinction of prey species.
    4) Production of chemicals such as nicotine, strychnine by the plants is disordered.
    The two correct statements are

    (a)

    (2) and (3)

    (b)

    (3) and (4)

    (c)

    (1) and (4)

    (d)

    (1) and (2)

  7. Consider the following four conditions (A-D) and select the correct pair of them as adaptation to environment in desert lizards.
    The conditions:
    A) Burrowing in soil to escape high temperature.
    B) Losing heat rapidly from the body during high temperature
    C) Bask in sun when temperature is low
    D) Insulating body due to thick fatty dermis.

    (a)

    (A) and (C)

    (b)

    (B) and (D)

    (c)

    (A) and (B)

    (d)

    (C) and (D)

  8. When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt=rN(1-N/K):

    (a)

    When N/K is exactly one

    (b)

    When N nears the carrying capacity of the habitat

    (c)

    When N/K equals zero

    (d)

    When dearth rate is greater than birth rate

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

    (a)

    Biome

    (b)

    Niche

    (c)

    Species

    (d)

    Population

  10. Pick out the eurythermal organism

    (a)

    Fish

    (b)

    Frog

    (c)

    Tiger

    (d)

    Lizards

  11. Locomotory speed of an organism changes due to light. This phenomenon is referred as _____________

    (a)

    Photonasty

    (b)

    Photokinesis

    (c)

    Phototropism

    (d)

    Phototaxis

  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. Assertion (A): Movement of organism from one place to another and back is called migration.
    Reason (R): Eel is an example for anadromous migration.

    (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

  15. Given below are some examples for population interactions. Which among the following shows mutualism?

    (a)

    Lion and deer

    (b)

    Man and tape worm

    (c)

    Hermit crab and sea-anemone

    (d)

    Sucker fish and shark

  16. 2 Marks

    10 x 2 = 20
  17. What is Pedogenesis?

  18. Differentiate between Eurytherms and Stenotherms.

  19. Explain hibernation and aestivation with examples.

  20. What are ecological equivalents?

  21. StateIordon's rule.

  22. What does Jordon's rule state?

  23. Point out the major functions of soil.

  24. Define alpine zone

  25. How do animals like fishes and bears avoid unfavourable climatic conditions?

  26. What are the attributes of population?

  27. 3 Marks

    10 x 3 = 30
  28. What are the ways by which organisms respond to abiotic factors?

  29. Classify the adaptive traits found in organisms

  30. Differentiate J and S shaped curve

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

  32. Eurythermy is advantageous to the animal. Justify.

  33. Define population.

  34. Define migration.

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

  36. What are the four ways through which the living organisms respond to abiotic factor?

  37. Census refers to the official count or survey of population. Every 10 years our government undertake census. In India the next census will be carried out in 2021. Mention any four characters that are employed in human population census

  38. 5 Marks

    7 x 5 = 35
  39. List the adaptations seen in terrestrial animals

  40. Describe Population Age Distribution

  41. List the adaptations of aquatic animals.

  42. List out the properties of soil

  43. Write a note on grassland biome.

  44. Write in detail about Temperate forest and its types.

  45. Differentiate between r-selected species and k-selected species

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