The length of the pollen tube depends on the distance between :
(a) pollen grain and the upper surface of the stigma
(b) pollen grain on the upper surface of stigma and ovule
(c) pollen grain in anther and the upper surface of the stigma
(d) the upper surface of stigma and lower part of the style

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Solution

(b) pollen grains on the upper surface of stigma and ovule.

Pollen grains land on the surface of the stigma. Hence, the pollen tube is formed so that the pollens can reach the ovules present in the ovary.

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Question 15
Length of pollen tube depends on the distance between

(a) pollen grain and upper surface of stigma
(b) pollen grain on upper surface of stigma and ovule
(c) pollen grain in anther and upper surface of stigma
(d) upper surface of stigma and lower part of style

The mechanism which brings pollen grains on to the surface of stigma is pollination.

Q. Pollen grains are produced in
(a) stigma
(b) filament
(c) anther
(d) style

Pollination refers to the
(a)transfer of pollen from the anther to the ovary
(b)transfer of male gametes from the anther to the stigma
(c)transfer of pollen grains from anther to stigma
(d)transfer of pollen from anther to ovule

Q. Classify the given statements under the headings 'self pollination ' and 'cross pollination'.
a. Transfer of pollen grains from the anther to the stigma of the same flower.
b. Transfer of pollen grains from the anther to the stigma of a different flower.
c. No need of pollinators to transfer pollen grains.
d. Produces large amounts of pollen grains.
e. Requires pollinators to transfer pollen grains.

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The length of the pollen tube depends on the distance between : (a) pollen grain and the upper surface of the stigma (b) pollen grain on the upper surface of stigma and ovule (c) pollen grain in anther and the upper surface of the stigma (d) the upper surface of stigma and lower part of the style

(b) pollen grains on the upper surface of stigma and ovule. Pollen grains land on the surface of the stigma. Hence, the pollen tube is formed so that the pollens can reach the ovules present in the ovary.

The length of the pollen tube depends on the distance between :
(a) pollen grain and the upper surface of the stigma
(b) pollen grain on the upper surface of stigma and ovule
(c) pollen grain in anther and the upper surface of the stigma
(d) the upper surface of stigma and lower part of the style

(b) pollen grains on the upper surface of stigma and ovule.

Pollen grains land on the surface of the stigma. Hence, the pollen tube is formed so that the pollens can reach the ovules present in the ovary.