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The growth of pollen tubes towards ovule...

The growth of pollen tubes towards ovules is due to

A

hydrotropism

B

chemotropism

C

geotropism

D

phototropism

Text Solution

Verified by Experts

The correct Answer is:
B
The growth of a pollen tube towards ovule is induced by a chemical (sugar) substance secreted by the ripened stigma of flower into the style towards ovary.
It is an example of chemotropism, pollen grain responds to stimulus by growing a polen tube in downward direction, towards ovule for fertilisation.
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Knowledge Check

  • Growth of pollen tube is

    A
    Apical
    B
    Basal
    C
    Intercalary
    D
    Diffused.

  • The movement of pollen tube towards ovule is

    A
    Chemotropism
    B
    Haptotropism
    C
    Chemonastic
    D
    Photonasty

  • Movement of pollen tube towards ovule is

    A
    Chemotropism
    B
    Hapototropism
    C
    Thigmotropism
    D
    Phototropism.

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