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Why is the growth of a pollen tube towards an ovule considered directional?

Answer and explanation

Correct answer: Because it grows in the direction of chemical signals

The governing concept is chemotropism, a directional growth response to a chemical stimulus. Chemicals released or present near the ovule guide the pollen tube toward it, allowing the male gametes to reach the female gametophyte for fertilisation. Therefore option A is correct. Sound does not guide the tube, pollen tubes have no spinal-cord connection, and insulin is an animal hormone unrelated to this plant process.

Related tags

ChemotropismPollen TubeDirectional GrowthControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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