Chemotropic growth of pollen tube in the pistil is in response of.

Potassium gradient

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Magnesium gradient

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Calcium gradient

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Phosphorus gradient

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Solution

The correct option is C Calcium gradient
The ovary releases chemicals that stimulates a positive chemotropic response from the developing pollen tube. In response the tube develops a defined tip growth area that promotes directional growth and elongation of the pollen tube due to a calcium gradient. The steep calcium gradient is localized in the tip and promotes elongation and orientation of the growth. This calcium gradient is essential for the growth to occur.
Hence, the correct answer is (C)

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Similar questions

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

Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.

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