The present on the surface of the pollen and the stigma determine whether they are comptatible or incompatible.

antigens

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proteins

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nucleoproteins

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lipids

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Solution

The correct option is B proteins
The compatibility or incompatibility of the pollen grains with the stigma depend upon the interaction between proteins on their surfaces. Pollen tubes are formed only if the proteins are complimentary to each other, otherwise the pollen just disintegrates without germination.

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Similar questions

Q. Self-incompatibility prevents pollen tube formation by pollen grains on the stigma of the__________.

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

Q. The part of gynoecium that determines the compatible nature of pollen is______.

Q. The part of gynoecium that determines the compatible nature of pollen is?

Q. Which of the following is an outbreeding device?

a. If pollen release and stigma receptivity are not synchronized.

b. If the anther and stigma are placed at different positions so that pollen cannot come in contact with the stigma of the same flower.

c. Self-incompatibility which prevents self-pollen (from the same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.

d. Production of the unisexual flower.

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