NEET Biology Solved Question Paper 2009

Multiple Choice Questions

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Stomata open or close due to the ion

  • Ca2+

  • Na+

  • K+

  • Cu+

C.

K+

Opening and closing of stomata takes place due to the presence of K+ ion. When guard cellspossess more K+, endosmosis takes place, guard cells become turgid and stomata opening takes place.

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    The specific character of C4  plants is

    • bulliform cells

    • Kranz anatomy

    • parallel venation

    • isobilateral leaf

    Answer

    In the electron transport chain, in terminal oxidation, the cytochrome, which donates electrons to O2 is

    • cytochrome- b 

    • cytochrome- c

    • cytochrome- a3

    • cytochrome- a

    Answer

    Flash of light in dark inhibits flnwering in

    • SDP

    • LDP

    • LSDP

    • DNP

    Answer

    Which of the following clogs the cavity of the xylem vessels?

    • Tylosis

    • Cystolith

    • Hydathode

    • Raphide

    Answer
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    Which of the following has multiflagellate sperms?

    • Equisetum

    • Riccia

    • Lycopodium

    • Anthoceros

    Answer

    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

    Wilting of leaves at noon and their recovery toward evening is known as

    • incipient wilting

    • temporary wilting

    • midday desiccation

    • permanent wilting

    Answer

    Internodal elongation is stimulated by

    • auxin

    • cytokinin

    • gibberellin

    • phenol

    Answer
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    Which of the following induces and promotes cell division?

    • ABA

    • Auxin

    • Cytokinin

    • Gibberellin

    Answer