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Question

Growth of pollen tube towards embryo sac is

A
Geotropism
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B
Thigmotaxis
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C
Chemotropic
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D
Phototaxis
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Solution

The correct option is C Chemotropic
In angiosperms and some gymnosperms, the male gametes are transported to the embryo sac to complete the process of fertilisation. When a pollen grain lands on a stigma, the pollen tube continues to go down the pistil till it reaches the embryo sac. Its growth is chemotropic (grows toward a source of chemicals) likely toward calcium, boron, and/or auxin. The ovule is the source of the chemical. Thus, the correct answer is option C.

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