The growth of a pollen tube towards the ovule caused by a sugary substance as a stimulus in an example of :

(a) phototropism

(b) chlorotropism

(c) gravitropism

(d) chemotropism

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Solution

(d) chemotropism

The growth of pollen tubes towards the ovule caused by a sugary substance is an example of chemotropism.

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Question 18
The growth of pollen tubes towards ovules is due to

(a) hydrotropism
(b) chemotropism
(c) geotropism
(d) phototropism

'A'	'B'
1. Growth of pollen tube towards ovule 2. Growth of shoot system 3. Growth of root system 4. Growth towards water	a. Gravitropic movement b. Chemotropic movement c. Phototropic movement d. Growth-irrelevant movement e. Hydrotropic movemen

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