Plant growth regulators — cell division: Which plant hormone primarily promotes cell division? Context: Cytokinesis stimulation in meristematic tissues and tissue culture. Choose the correct hormone class.

Difficulty: Easy

Cytokinins (e.g., kinetin, zeatin)
Auxins (e.g., IAA)
Abscisic acid (ABA)
Ethylene

Correct Answer: Cytokinins (e.g., kinetin, zeatin)

Explanation:

Concept
Cytokinins stimulate cell division (cytokinesis), promote shoot initiation in tissue culture, and delay senescence. Auxins promote cell elongation; ABA is generally growth-inhibitory; ethylene has diverse effects (e.g., fruit ripening).

Final Answer
Cytokinins.

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