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Which plant hormone is responsible for cell division?
Cytokinin
Auxin
Gibberellin
Abscisic acid
Cytokinin
Cytokinin is the primary plant hormone responsible for promoting cell division, a process known as cytokinesis. It stimulates cell proliferation in roots and shoots, often working in tandem with auxins to regulate plant organ development.
Cytokinin is the primary plant hormone responsible for promoting cell division, a process known as cytokinesis. It stimulates cell proliferation in roots and shoots, often working in tandem with auxins to regulate plant organ development.
If a plant is a construction site, cytokinin acts as the 'hiring manager' who brings in more workers (cells) to expand the project, while auxin acts as the 'architect' deciding where the building grows.
CYTO-kinin for CYTO-kinesis (Cell division).
C10тАЛH9тАЛN5тАЛO тАФ Molecular formula of Zeatin, a common naturally occurring cytokinin.
Cytokinins, which are adenine derivatives, bind to specific membrane-bound receptors in the cell. This binding activates a signaling pathway (the two-component signaling system) that regulates the expression of genes involved in the cell cycle, specifically promoting the transition from the G2тАЛ phase to mitosis. They also delay senescence and promote nutrient mobilization.
Cytokinins promote lateral bud growth and counteract apical dominance.
They are synthesized primarily in the roots and transported to other parts of the plant.
A high cytokinin-to-auxin ratio promotes shoot development, while a low ratio promotes root development.
Used in tissue culture to induce shoot regeneration.
Helps in maintaining the shelf-life of harvested vegetables by delaying yellowing.
Plant tissue culture for micropropagation.
Agricultural use to increase yield by delaying leaf senescence.
Option B (Auxin) is primarily responsible for cell elongation and apical dominance.
Option C (Gibberellin) is responsible for seed germination, stem elongation, and fruit growth.
Option D (Abscisic acid) is a growth inhibitor that promotes dormancy and closure of stomata.
A is correct тАФ Cytokinin is the specific hormone that promotes cytokinesis and cell division in plants.
In competitive exams, remember the antagonism: Auxins promote root growth while Cytokinins promote shoot growth; their balance is the key to plant morphogenesis.
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