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Fruits and seeds have a high concentration of which of the following plant hormones?
Auxin
Gibberellin
Cytokinin
Abscisic acid
Cytokinin
Cytokinins are a class of plant growth substances (phytohormones) that promote cell division (cytokinesis) in plant roots and shoots. Because fruits and seeds undergo rapid cell division, differentiation, and growth during their development, they contain the highest concentration of naturally occurring cytokinins.
Cytokinins are a class of plant growth substances (phytohormones) that promote cell division (cytokinesis) in plant roots and shoots. Because fruits and seeds undergo rapid cell division, differentiation, and growth during their development, they contain the highest concentration of naturally occurring cytokinins.
Think of cytokinins as the 'construction supervisors' that order cells to divide and multiply. Just like a mega-construction site needs the highest number of supervisors to build rapidly, developing fruits and seedsтАФwhich are actively growing and multiplying their cellsтАФrequire the highest concentration of cytokinins.
CYTOkinin = CYTOkinesis (Cell division) in young seeds & fruits!
Cytokinin┬а/┬аAuxin┬аRatio тАФ controls organogenesis in plant tissue culture (High ratio тЖТ Shoots, Low ratio тЖТ Roots)
Cytokinins are synthesized mainly in root apices and developing young tissues, such as seeds, fruits, and young leaves. During seed development and fruit setting, rapid cell division occurs, creating a high physiological demand for cell division-promoting hormones. Cytokinins also induce nutrient mobilization and delay senescence (aging) in these developing storage tissues.
Cytokinins (e.g., Zeatin, Kinetin) are natural plant hormones essential for cell division (cytokinesis).
Developing seed embryos and growing fleshy fruits have the highest metabolic demand for cell division, resulting in peak cytokinin concentration.
Cytokinins also counteract the apical dominance caused by auxin, encouraging lateral shoot growth.
The Richmond-Lang effect refers to the ability of cytokinins to delay leaf senescence (aging) by keeping chlorophyll intact.
Used in plant tissue culture to promote shoot formation from callus.
Applied in agriculture to increase fruit size and delay senescence in leaf crops.
Option A (Auxin): Synthesized at shoot tips; responsible for cell elongation and apical dominance, not cell division in fruits/seeds.
Option B (Gibberellin): Responsible for stem elongation, bolting, and breaking seed dormancy.
Option D (Abscisic Acid): Known as the 'stress hormone' or growth inhibitor; induces seed dormancy and stomatal closure during drought.
C is correct тАФ Cytokinins are present in high concentrations in regions of rapid cell division, particularly in developing fruits and seeds.
For competitive exams, remember hormone pairings: Auxin vs Cytokinin (Apical Dominance vs Lateral Growth) and Gibberellin vs Abscisic Acid (Germination/Growth vs Dormancy/Stress).
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