The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of (a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism
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Answer:
chemotropism
Explanation:
this is because the pollen grains move towards the ovule with the chemical as pheromones..
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Answer:
(d) Chemotropism
Explanation:
The growth of pollen tubes towards ovules is due to chemotropism. Fertilization of flowers by pollen is achieved because the ovary releases chemicals that produce a positive chemo-tropic response from the developing pollen tube.
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