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KEAM Cytokinin — practice questions

Explore 2 free Cytokinin questions in KEAM Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Cytokinin questions and exercises with answers

Showing questions 1–2 of 2.

**Cytokinins** are best known for promoting:Read the answer and worked solution →The **Richmond-Lang effect** describes the action of:Read the answer and worked solution →

Worked practice questions

**Cytokinins** are best known for promoting:

  1. Cell division (cytokinesis) and delay of leaf senescence
  2. Stomatal closure under stress
  3. Fruit ripening
  4. Apical dominance
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Correct answer: A. Cell division (cytokinesis) and delay of leaf senescence

Cytokinins (e.g. kinetin, zeatin) — first identified from coconut milk (Skoog). Promote cell division and shoot/lateral bud development. Delay leaf senescence (Richmond-Lang effect). Synthesised in roots, transported to shoots.

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The **Richmond-Lang effect** describes the action of:

  1. Auxin in stem elongation
  2. Cytokinins in delaying leaf senescence
  3. Gibberellins in seed germination
  4. ABA in dormancy
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Correct answer: B. Cytokinins in delaying leaf senescence

Richmond & Lang (1957): applying kinetin (a cytokinin) to detached leaves DELAYS yellowing/senescence. Cytokinins retain chlorophyll, protein and RNA in aging leaves. Used in horticulture (cut flowers).

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