What happens when a pollen grain falls on a stigma?

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Solution

When pollen grains reached stigma, substances present on stigma start germination of pollen grains. After the start of germination, a tube starts to grow from pollen grain and reaches to the ovary through style. In the ovule of the ovary, stamens fuse with the pistil. This fusion form zygote by fertilization process. After the fertilization process, the ovule is developed into seed during ovary into a fruit.

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(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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