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12th Standard Biology English Medium Principles Of Ecology 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. Ecology is the study of an individual species is called
    i) Community ecology
    ii) Autecology
    iii) Species ecology
    iv) Synecology

    (a)

     i only

    (b)

    ii only 

    (c)

     i and iv only

    (d)

    ii and iii only

  2. Read the given statements and select the correct option.
    i) Loamy soil is best suited for plant growth as it contains a mixture of silt, sand and clay.
    ii) The process of humification is slow in case of organic remains containing a large amount of lignin and cellulose.
    iii) Capillary water is the only water available to plant roots as it is present inside the micropores.
    iv) Leaves of shade plant have more total chlorophyll per reaction centre, low ratio of chl a and chl b are usually thinner leaves.

    (a)

    i, ii and iii only

    (b)

    ii, iii and iv only

    (c)

    i, ii and iv only

    (d)

    ii and iii only

  3. In soil water available for plants is

    (a)

    gravitational water

    (b)

    chemically bound water

    (c)

    capillary water

    (d)

    hygroscopic water

  4. Read the following statements and fill up the blanks with correct option.
    i) Total soil water content in soil is called _________________
    ii) Soil water not available to plants is called _________________
    iii) Soil water available to plants is called

    (a)
    (i) (ii) (iii)
    Holard Echard Chresard
    (b)
    i ii iii
    Echard Holard Chresard
    (c)
    i ii iii
    Chresard Echard Holard
    (d)
    i ii iii
    Holard Chresard Echard
  5. Ophrys an orchid resembling the female of an insect so as to able to get pollinated is due to phenomenon of

    (a)

    Myrmecophily

    (b)

    Ecological equivalents

    (c)

    Mimicry

    (d)

    None of these

  6. Pedogenesis refers to

    (a)

    Fossils

    (b)

    Water

    (c)

    Population

    (d)

    Soil

  7. Mycorrhiza promotes plant growth by

    (a)

    Serving as a plant growth regulators

    (b)

    Absorbing inorganic ions from soil

    (c)

    Helping the plant in utilizing atmospheric nitrogen

    (d)

    Protecting the plant from infection

  8. In a fresh water environment like pond, rooted autotrophs are

    (a)

    Nymphaea and typha

    (b)

    Ceratophyllum and Utricularia

    (c)

    Wolffia and pistia

    (d)

    Azolla and lemna

  9. Strong, sharp spines that get attached to animal’s feet are found in the fruits of

    (a)

    Argemone

    (b)

    Ecballium

    (c)

    Heritier

    (d)

    Crossandra

  10. Environment of any community is called

    (a)

    Paratope

    (b)

    Ecotype

    (c)

    Opitope

    (d)

    Biotope

  11. The study of soil is called as __________

    (a)

    Lithotripsy

    (b)

    Lithosphere

    (c)

    Pedology

    (d)

    Pedigree analysis

  12. Identify the indicators of fire.

    (a)

    Pucinia

    (b)

    Pyricularia

    (c)

    Pyronema

    (d)

    Peziza

  13. Statement 1: Holoparsites depend totally on other organisms for nutrition.
    Statement 2: Durnta is holoparasite.

    (a)

    Statement 1 is correct. Statement 2 is incorrect.

    (b)

    Statement 1 is incorrect. Statement 2 is correct

    (c)

    Both the statements are correct.

    (d)

    Both the statements are incorrect

  14. Assertion (A) : Plains and valleys are rich in vegetation
    Reason (R): Slow drain of surface water and better water retention is noticed.

    (a)

    A is true R is false

    (b)

    R explains A

    (c)

    A and R are false

    (d)

    A and R are true. But R doesnot explains A

  15. Earth day is observed on

    (a)

    April 22nd

    (b)

    March 21st

    (c)

    July 07th

    (d)

    September 16th

    1. 2 Marks

    10 x 2 = 20
  16. What is ecological hierarchy? Name the levels of ecological hierarchy.

  17. Distinguish habitat and niche

  18. ‘Green algae are not likely to be found in the deepest strata of the ocean’. Give at least one reason.

  19. What is Phytoremediation ?

  20. What is Albedo effect and write their effects?

  21. What is ecological hierarchy?

  22. Define
    (a) Autecology
    (b) Synecology

  23. What is Albedo effect?

  24. Given below are few types of plants. Mention their habitats.
    (a) Halophytes
    (b) Chasmophytes
    (c) Cryophytes
    (d) Psammophytes.

  25. Name any two positive interactions with an example for each.

    1. 3 Marks

    10 x 3 = 30
  26. What is mutualism? Mention any two example where the organisms involved are commercially exploited in modern agriculture.

  27. Mention any two significant roles of predation plays in nature.

  28. Why do submerged plants receive weak illumination than exposed floating plants in a lake?

  29. What is seed ball?

  30. What is thermal stratification? Explain its types.

  31. Explain briefly about the three types of fire.

  32. Direction of mountain determines the richness of vegetation - Justify.

  33. Mention any two species that exhibits protective mimicry.

  34. What is co-evolution? Explain with example.

  35. Point out the Anatomical adaptations exhibited by the Halophytes.

    1. 5 Marks

    7 x 5 = 35
  36. How is anemochory differ from zoochory?

  37. Explain Raunkiaer classification in the world’s vegetation based on the temperature

  38. What is soil profile? Explain the characters of different soil horizons.

  39. Enumerate the anatomical adaptations of xerophytes.

  40. What are the advantages of seed dispersal?

  41. Explain various edaphic factors that affect vegetation.

  42. Point out any five morphological adaptations of epiphytes.

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