Botany - Principles of Ecology Book Back Questions

12th Standard EM

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Biology

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. In soil water available for plants is

    (a)

    gravitational water

    (b)

    chemically bound water

    (c)

    capillary water

    (d)

    hygroscopic water

  2. 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
  3. Pedogenesis refers to

    (a)

    Fossils

    (b)

    Water

    (c)

    Population

    (d)

    Soil

  4. 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

  5. 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

  6. 3 x 2 = 6
  7. Soil formation can be initiated by biological organisms. Explain how?

  8. Sandy soil is not suitable for cultivation. Explain why?

  9. Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.

  10. 3 x 3 = 9
  11. How is rhytidome act as the structural defence by plants against fire?

  12. What is myrmecophily?

  13. What is seed ball?

  14. 2 x 5 = 10
  15. List out any five morphological adaptations of halophytes.

  16. Describe dispersal of fruit and seeds by animals.

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