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    CBSE

    Subject

    Biology
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    NEET Biology : Plant Growth and Development

    Multiple Choice Questions

    141.

    Internodal elongation is stimulated by

    • auxin

    • cytokinin

    • gibberellin

    • phenol

    Answer
    • 142.

    The mutagenic agent among following is

    • ethyl methane

    • ethylene

    • 2, 4-D

    • IAA

    Answer
    • 143.

    Artificial application of auxins like IAA, IBA and NAA to unpollinated pistils can form

    • fruits with much flash

    • larger fruits

    • sweet fruits

    • seedless fruits

    Answer
    • 144.

    Which one of the following is a natural growth inhibitor?

    • NAA

    • ABA

    • IAA

    • GA

    Answer
    • 145.

    Leaf abscission is caused by

    • ABA

    • cytokinin

    • auxin

    • gibberellin

    Answer
    • 146.

    Plant length is increased by

    • apical meristem

    • lateral meristem

    • dermarogen

    • periblem

    Answer
    • 147.

    Flash of light in dark inhibits flnwering in

    • SDP

    • LDP

    • LSDP

    • DNP

    Answer
    • 148.

    First natural cytokinin was discovered by :

    • Skoog and Miller

    • Letham

    • Benson and Calvin

    • Thimann and Went

    Answer
    • 149.

    Which one is a short day plant?

    • Brassica campestris

    • Raphanus sativus

    • Glycine max

    • Papaver somniferum

    Answer
    • 150.

    The synthetic hormone used as a weedicide is

    • Indole 3-acetic acid

    • gibberellic acid

    • 2, 4- D 

    • Indole butyric acid

    Answer
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