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

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