Monday, October 14, 2013

PLANT ECOLOGY

1.    The hydrophyte that have contact with water only
    1) Nymphaca    2) Ceratophyllum
    3) Vallisneria    4) Typha
2.    Find the pair of hydrophytes that are neither in contact with soil nor air
    1) Vallisneria, Hydrilla
    2) Hydrilla, Utricularia
    3) Salvita, Azolla
    4) Limnophila, Ceratophyllum
3.    Abundant aerenchyma and xylem cavity in the stele are the features found in    ( NEET )
    1) Sterm of Hydrilla
    2) Roots of Cicer
    3) Sterm of Opuntia
    4) Roots of Asparagus
4.    Select the pair of plants that show contact with soil and water, but not with air
    1) Potamogeton, Vallisneria
    2) Hydrilla, Ceratophyllum
    3) Wolffia, Sagittaria
    4) Cyperus, Typha
5.    Useful adaptation for hydrophytes
    1) Large leaves
    2) Decrease in mechanical tissue
    3) Large mechanical tissue
    4) Increase in aerenchyma
6.    Anatomically all hydrophytes are similar in having
    1) Aerenchyma    2) Collenchyma
    3) Stomata    4) Cuticle
7.    Well developed mechanical tissue and vascular tissues are seen in
    1) Hydrophytes    2) Mesophytes
    3) Xerophytes    4) Halophytes
8.    Multiple epidermis, sunken stomata with stomatal hairs in Nerium leaf represent
    1) Xerophytic adaptation
    2) Mesophytic adaptation
    3) Hydrophytic adaptation
    4) Halophytic adaptation
9.    Researchers like Robert Constanza et.al, have put an average price of US$___ trillion a year on the fundamental ecological services
    1) 33    2) 50
    3) 6    4) 18
10.    Find out the correct order of succession levels in xerarch            ( NEET )
    1) lichen moss stage, annual herb stage, perential herb stage, shrub stage, forest
    2) annual herb stage, perential herb stage, linchen moss stage, shrub stage, forest
    3) perential herb stage, annual herb stage, lichen moss stage, shrub stage, forest
    4) shrub stage, forest, annual herb stage, pernnial stage, lichen moss stage
11.    Amount of CO2 absorbed by plant to produce 180gm of glucose            ( NEET )
    1) 216 gm    2) 264 gm
    3) 192 gm    4) 108 gm
12.    Minimum diversity is found in
    1) Moss stage    2) Climax community
    3) Pioneer community     4) Seral community
13.    In ecological succession from pioneer to climax stage, the biomass shall
    1) Increase continuously
    2) Decrease
    3) Increase and then decrease
    4) No relation
14.    According to Millennium Ecosystem Assessment ecosystem services are grouped into this many categories        ( NEET )
    1) 3          2) 2          3) 4         4) 5
15.    Amount of CO2 abosorbed by plant to produce 180gm of glucose
    1) 216gm 2) 264 gms        3) 192 gm    4) 108 gms
16.    To produce 1gm dry organic matter the amount of CO2 fixed is
    1) 1.98 gm    2) 20 gm
    3) 1.63 gm    4) 40 gm
17.    The purpose of developing a carbon tax system in many countries is to
    1) reduce green house gases
    2) cut down CO2 in atmosphere
    3) cut down CO in atmosphere
    4) All the above
18.    An effective measure to prevent global warming is            ( NEET )
    1) Drip - irrigation
    2) afforestation
    3) to provide growth chambers
    4) None
19.    The amount of oxygen produced by a tree depends on
    1) the species of tree    2) the age of tree
    3) its health    4) All the above
20.    “The lungs of the world” are
    1) Plants    2) Planktons
    3) Human beings    4) a and b
Assertion & Reason Questions :
    1) If both A and R are true, and R is the correct explanation of A
    2) If both A and R are true, and R is not the correct explanation of A
    3) If A is true R is false
    4) If both A and R are false
21.    A : Hydrophytes do not possess root hairs
    R : Chief anatomical adaptation of hydrophytes is the presense of aerenchyma
22.    A : The stem of hydrophytes is soft, delicate and more or less spongy
    R : Most of the hydrophytes show poorly developed sclerenchyma and xylem
23.    A : Stomata is a free floating hydrophte plants
    R : All free floating plants are invariably flowering platns
24.    A : The phenomenon of succession is community controlled
    R : Each group of organisms changes its physical substrate and microculimate to make the conditions favourable for other group of organisms
25.    A : Crustose lichens are the pioneer community of a lithosere             ( NEET )
    R : During the climax stage of lithosere, the increasing humus content of soil favour the mesophytic vegetation
26.    Most of the plants cultivated in agriculture are actually belonging to the succession level
    1) early 10 succession            ( NEET )
    2) late 10 succession
    3) early 20 succession
    4) late 20 succession

key
1) 2    2) 2    3) 1    4) 1    5) 4
6) 1    7) 3    8) 1    9) 1    10) 1
11) 2    12) 3    13) 1    14) 3    15) 2
16) 3    17) 4    18) 2    19) 4    20) 4
21) 2    22) 1    23) 3    24) 1    25) 2
26) 4

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ASTHRA JUNIOR COLLEGE , VIJAYAWADA