Xylem differentiation is facilitated by

auxin

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cytokinin

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gibberellin

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ethylene

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Solution

The correct option is A auxin
Auxins, cytokinins, gibberellins and ehtylene are plant growth hormones which help in the development of the plant.

S.No. Plant growth hormone Function

1. Auxin Promotes xylem differentiation i.e. cambium cells (meristematic cells) give rise to differentiated xylem cells like tracheids, xylem parenchyma.

2. Gibberellin Overcomes dwarfism in genetically dwarf plants.

3. Cytokinin Helps in the production of leaves, chloroplast in leaves, lateral shoot growth and adventitious shoot formation.

4. Ethylene Stimulates fruit ripening.

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Auxin, Cytokinin and Ethylene are examples of:

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S.No.	Plant growth hormone	Function
1.	Auxin	Promotes xylem differentiation i.e. cambium cells (meristematic cells) give rise to differentiated xylem cells like tracheids, xylem parenchyma.
2.	Gibberellin	Overcomes dwarfism in genetically dwarf plants.
3.	Cytokinin	Helps in the production of leaves, chloroplast in leaves, lateral shoot growth and adventitious shoot formation.
4.	Ethylene	Stimulates fruit ripening.