Biology Today — January 2018

(Jacob Rumans) #1

  1. Consider the following statements and select the incorrect
    ones regarding the modifications of stem.
    I. Twiners are flexible and insensitive stems that are
    unable to coil around an upright support by itself.
    II. Procumbent trailers are shoots that spread
    horizontally along the ground with branches
    spreading in all directions.
    III. Offsets are one internode long small runners found
    in rosette plants at the surface of ground or water.
    I V. Scramblers are stem having sensitive structures that
    rise up a support by itself.
    (a) I, III and IV (b) II and III
    (c) I, II and IV (d) I, II, III and IV

  2. A bulb in which fleshy scales represent buds that occur in
    irregular concentric rings around the central floral axis is
    found in
    (a) onion (b) garlic
    (c) tulip (d) lily.

  3. A compound corymb showing indeterminate inflorescence
    in which flowers remain undeveloped is found in
    (a) Brassica oleraceae (b) Cassia fistula
    (c) Azadirachta indica (d) Foeniculum vulgare.

  4. Spines present on the areoles of Opuntia represent
    (a) stems (b) leaves
    (c) buds (d) scales.

  5. Identify the incorrect pair.
    (a) Tap root system – Asparagus
    (b) Fibrous root system – Wheat
    (c) Fasciculated roots – Dahlia
    (d) Stilt roots – Sorghum

  6. An inflorescence has a small conical receptacle surrounded
    by involucre of coloured bracts, giving the appearance
    of a flower. It comprises of pedicellate achlamydeous
    unisexual flowers with single female flower centrally placed
    surrounded by numerous centrifugally arranged male
    flowers. This type of inflorescence is identified as
    (a) verticillaster (b) hypanthodium
    (c) cyathium (d) capitulum.

  7. Select the correctly matched pair.
    (a) Unbranched stem – Marchantia
    (b) Dichotomous branching – Saraca
    (c) Monopodial branching – Eucalyptus
    (d) Dichasial branching – Sugarcane

  8. Match the columns and select the correct option.
    Column I Column II
    A. Uniparous helicoid (i) Heliotropium
    B. Biparous cyme (ii) Drosera
    C. Monochasial scorpioid (iii) Asclepias
    D. Polychasial cyme (iv) Spergula
    (a) A-(ii), B-(iv), C-(i), D-(iii)
    (b) A-(iii), B-(ii), C-(i), D-(iv)
    (c) A-(iii), B-(iv), C-(i), D-(ii)
    (d) A-(iii), B-(ii), C-(iv), D-(i)

  9. Roots carry out the function of balancing in
    (a) Cuscuta (b) Lemna
    (c) Utricularia (d) Tinospora.

  10. Identify the correct set of statements.
    I. In leguminous plants, the swollen leaf base is called
    pulvinus.
    II. In Australian acacia, the buds become fleshy and
    store mucilage.
    III. Curcuma is a straggling rhizome with sympodial axis.
    I V. The leaves in Alstonia show alternate phyllotaxy.
    (a) I and IV (b) II and III
    (c) I and III (d) II, III and IV

  11. Read the given statements and select the correct option.
    Statement 1 : Mangrove plants possess pneumatophores.


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Contributed by : Kunal Sharma (Delhi), Ajay Tyagi (U.P.)
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MPP-9 CLASS XII ANSWER KEY



  1. (c) 2. (b) 3. (d) 4. (b) 5. (c)

  2. (c) 7. (d) 8. (b) 9. (b) 10. (d)

  3. (d) 12. (d) 13. (b) 14. (b) 15. (c)

  4. (d) 17. (b) 18. (d) 19. (a) 20. (a)

  5. (d) 22. (a) 23. (d) 24. (b) 25. (c)

  6. (a) 27. (d) 28. (c) 29. (b) 30. (c)

  7. (b) 32. (b) 33. (c) 34. (d) 35. (b)

  8. (a) 37. (a) 38. (a) 39. (a) 40. (c)

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