Sunday, January 5, 2014


1.    Part of the plant body where Abscisic acid is not synthesized but Cytokinins are synthesized is
    1) Leaves    2) Flowers
    3) Roots    4) Seeds
2.    If the influence of auxin on a particular part of the axis of a horizontally placed seedling is negative, then
    I) That organ shows positive phototropism
    II) That organ shows negative phtotropism
    III) That organ shows positive geotropism
    IV) That organ shows negative geotropism
    The correct combination is
    1) I and II    2) II and III
    3) II and IV    4) III and IV
3.    Avena coleotile curvature test, the bioassy for auxins, is used to
    1) Detect the presence of auxin in the Avena coleoptile tip
    2) Determine the strength of auxin in the Avena coleoptile tip
    3) Determine the activity of auxin in darkness
    4) Test the biological activity of auxin from test materials other than Avena
4.    Which of the following phytohormones have similar effect on leaf senescence
    1) ABA and Ethylene   2) ABA and Zeatin
    3) ABA and GA   
    4) Ethylene and 2-4D
5.    Select a phytohormone synthesized from a compound known as connecting link of aerobic respiration            ( NEET )
    1) A hormone promoting seed germination
    2) A hormone promoting root initiation
    3) A hormone promoting triple response growth
    4) A hormone promoting opening of stomata
6.    The importance of coleoptile tip in phototropic curvature was first experimentally confirmed by
    1) Julius von Sachs
    2) Charles Darwin and Francis Darwin
    3) Boysen-Jenson
    4) F.W. Went
7.    Which one of the following statements concerning growth regulators is incorrect
    1) Gibberellins cause the formation of more male flowers in Cannabis
    2) Abscisic acid maintains seeds in a dormant state
    3) Cytokinins increase the K+ concentration in guard cells
    4) Some synthetic auxins control grass weeds in pulse crops
8.    Study the following statements and select the correct ones
    1) Auxin is transported from base to tip in large quantities
    2) Cells on the dark side divide rapid than those on the light side
    3) Apical dominance can be removed by the decapitation
    4) Tropic movements in plants are under the control of gibberellins
9.    Name the gaseous hormone which stimulates transverse of isodiametric growth
    1) ethylene    2) ABA
    3) sodium salt of NAA
    4) ethephon
10.    Darwin discovered that Canary Grass coeloptile bends towards light only when
    1) It is 5 cm long
    2) The seedlings is growing in blue light
    3) Coeloptile tip is intact and exposed to light
    4) Cooler nights
11.    Bioassay for gibberellin is
    1) Avena curvature test
    2) Seed dormancy test
    3) Dwarf maize test
    4) Green leaf test
12.    A green plant bends towards the source of light when exposed to the light on only one side.  Which of the following is the best explanation of the phenomenon?
    1) The apices of the stems are attracted by light
    2) The plant needs light for photoshynthesis
    3) Auxin accumulates on the shaded side to induce great cell elongation on that side
    4) Light reduces length
13.    Currect sequence of different phases of growth is
    1) Cell division, Cell differentiation, Cell eleongation
    2) Cell differentiation, Cell division, Cell elongation
    3) Cell elongation, Cell division, Cell differentiation
    4) Cell division, Cell elongation, Cell differentiation
14.    Exogenous GA induces formation of male flowers on genetically female plants of
    1) Cucurbita    2) Luffa
    3) Cucumis    4) Carica
15.    The compounds having a highly specific hydrophilic group or adenine and one non specific lipophilic group are named as
    1) auxins    2) cytokinins
    3) gibberellins    4) ethylene
16.    Maximum concentration of cytokinins occurs in
    1) growing embryos and fruits
    2) apical buds
    3) lateral buds and fruits
    4) root tips
17.    The phenomenon of delay of senescence by cytokinins is known as
    1) Richmond Lang effect
    2) Senescence of effect
    3) Loomis and Torry effect
    4) Sorokinetal effect, 1962
18.    Ethylene is a by product of
    1) developing seeds
    2) ripening in some fruits
    3) developing ovules
    4) germinating seeds
19.    Match the following
    List-I    List-II
    1) Auxin    p) GA
    2) Gibberellin    q) Indole acetic acid
    3) Cytokinin    r) Abscisic acid
    4) Dormin    s) Acetic acid
        t) Zeatin
    The correct match is
    1) a-q,b-r,c-p,d-t    2) a-q,b-s,c-p,d-t
    3) a-q,b-p,c-t,d-r    4) a-q,b-t,c-p,d-r
20.    For the production of flowering
    1) only a short exposure to appropriate photoperiod is required
    2) exposure to appropriate photoperiod at any short intervals is required
    3) short exposure to appropriate photoperiod at intervals of one hour is required
    4) continuous exposure to appropriate photopheriods are required for flowering
21.    The hormone capable of replacing the requirement of long photoperiods for flowering is
    1) ethylene    2) auxin
    3) gibberellin    4) cytokinin

22.    (A) : Cytokinins are antisenescent
    (R) : Effect of cytokinins is antagonistic to ethylene
    1) Both (A) and (R) are true and (R) is the correct explanation of (A)
    2) Both (A) and (R) are true and (R) is not the correct explanation of (A)
    3) (A) is true but (R) is false
    4) Both (A) are (R) wrong
23.    (A) : Gibberella fujikoroi causes bakane disease
    (R) : Fusarium moniliform is the perefect stage
    1) Both (A) and (R) are true and (R) is the correct explanation of (A)
    2) Both (A) and (R) are true and (R) is not the correct explanation of (A)
    3) (A) is true but (R) is false
    4) Both (A) are (R) wrong
24.    (A) : Gibberellins, when applied to dwarf plant increase the length of the plant
    (R) : Gibberellins induce internodal growth in some genetically dwarf varieties
    1) Both (A) and (R) are true and (R) is the correct explanation of (A)
    2) Both (A) and (R) are true and (R) is not the correct explanation of (A)
    3) (A) is true but (R) is false
    4) Both (A) are (R) wrong
25.    (A) : Cytokinins are produced in apical meristem region
    (R) : Cytokinins are essential for morphogenesis
    1) Both (A) and (R) are true and (R) is the correct explanation of (A)
    2) Both (A) and (R) are true and (R) is not the correct explanation of (A)
    3) (A) is true but (R) is false
    4) Both (A) are (R) wrong
26.    Which one of the following pairs is not correctly matched?
    1) Adenine derivative - Kinetin
    2) Carotenoid derivative - ABA
    3) Terpenes - IAA
    4) Indole compounds - IBA
    5) Gas - Ethylene
27.    Identify two physioligical processes induced by two different phytohormones having a common precursor, which is formed due to the catalytic activity of pyruvic dehydrogenase complex   [EAMCET]
    I) More female flowers in cucumber
    II) -amylase production in barley grain
    III) Acceleration of fruit ripening in tomato
    IV) Delay in sprouting of potato tubers
    The correct combination is
    1) I and II    2) I and III
    3) II and IV    4) III and IV
28.    How does prunning help in making the hedge dense?
    1) It induces the differentiation of new shoot from root stock
    2) It frees axillary buds from apical dominance
    3) The apical shoot grows faster after prunning
    4) It releases wound hormones
29.    Pick out the correct statements [Kerala CEE]
    I) Cytokinins especially help in delaing senescence
    II) Auxins are involved in regulating apical dominance
    III) Ethylene is especially used in enhancing seed germination
    IV) Gibberellins are responsible for immature falling of leaves
    1) I and III    2) I and IV
    3) II and IV    4) I and II
30.    Identify the pair of physiological effects of two phytohormones, which are synthesized from different amino acids?   [EAMCET]
    I) Formation of perennating buds in Lemna
    II) Simultaneus flowering in pineapple
    III) Bolting in cabbage
    IV) Apical dominance in Polyalthia
    1) II and IV    2) I and IV
    3) II and III    4) I and II
31.    Identify two of the following phytohormones, which regulate the stomatal movements ? [KCET]
    I) IAA   II) GA    III) Zeatin   IV) ABA
    1) I and III    2) II and III
    3) III and IV    4) II and IV
32.    One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered, while in the other set night phase was interrupted by flash of light and it did not produce flower.  Under which of the following catagoties will you place this plant?
    1) Long day    2) Darkness neutral
    3) Day neutral    4) Short day

    1) 3    2) 2    3) 4    4) 1    5) 1
    6) 2    7) 4    8) 3    9) 1    10) 3
    11) 3    12) 3    13) 4    14) 3     15) 2    16) 1    17) 1    18) 2    19) 3    20) 4     21) 3    22) 2    23) 3    24) 1    25) 2    26) 3    27) 3    28) 2    29) 4    30) 1    31) 3    32) 4   
1.    Gibberellic acid induces flowering in
    1) some plants only
    2) in long day plants under short day conditions
    3) in short day plants under long day conditions
    4) day neutral plants
2.    The hormones which regulate phloem transport are
    1) auxins    2) cytokinins
    3) gibberellins    4) ethylene
3.    Shock movement in ‘touch me not’ plant is
    1) seismonasty    2) photonasty
    3) chemonasty    4) thermonasty
4.    Increased availability of abscisic acid stimulates
    1) Lipid formation
    2) protein formation in cell
    3) starch synthesis is guard cells
    4) cellulose synthesis
5.    The tem photoperiodic after effect means
    1) providing the plant with appropriate photoperiods after the blossoming
    2) providing the plant with long exposures of appropriate photoperiods for flowering
    3) the effect of photoperiods after the flowering has occurred
    4) the production of flowers after a short exposure to appropriate photoperiods
6.    The phenomenon when plants require continuous photoperiodic treatment is known as
    1) Photoperiodic induction
    2) steady state induction
    3) fractional induction
    4) qualitative induction
7.    Photoperiodic induction can be produced
    1) when certain minumum vegetative growth has taken place
    2) when vegetative growth completely stops
    3) when plant reaches certain specific height
    4) irrespecitve of any of the above conditions
8.    The region of the spectrum which does not cause photoperiodic induction falls in
    1) blue region    2) red region
    3) green region    4) far red region
9.    Light break reaction means
    1) influence of short periods of dark in the light period
    2) influence of short periods of light in the dark periods
    3) influence of short periods of light in the dark periods
    4) production of some inhibitors during light periods
10.    Which of the following is the effect of a plant hormone which is synthesized more in the absence of light?
    1) Inhibits the development of seedless fruits
    2) Responsible for closing of stomata
    3) Induces the dormancy of seeds
    4) Length of intermodes increases


    1) 2         2) 2       3) 1        4) 3     5) 4
    6) 2    7) 1    8) 3    9) 2     10) 4

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