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KEAM Plant Growth — practice questions

Explore 10 free Plant Growth questions in KEAM Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Growth questions and exercises with answers

Showing questions 1–10 of 10.

**Auxins** were first isolated from:Read the answer and worked solution →Which hormone is gaseous and promotes **fruit ripening**?Read the answer and worked solution →**Photoperiodism** refers to:Read the answer and worked solution →**Cytokinins** are best known for promoting:Read the answer and worked solution →Which mineral is needed for **chlorophyll synthesis**?Read the answer and worked solution →Which element is a constituent of **nitrogenase enzyme** (catalyses biological N₂ fixation)?Read the answer and worked solution →The **Richmond-Lang effect** describes the action of:Read the answer and worked solution →**Hydroponics** is:Read the answer and worked solution →Match each stage of plant developmentRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →

Worked practice questions

**Auxins** were first isolated from:

  1. Coleoptile tips of oat (Avena sativa)
  2. Pea seeds
  3. Coconut milk
  4. Rice husk
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Correct answer: A. Coleoptile tips of oat (Avena sativa)

F.W. Went (1928) isolated auxin from oat (Avena) coleoptile tips. Indole-3-acetic acid (IAA) is the most common natural auxin. Promotes cell elongation, apical dominance, root initiation.

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Which hormone is gaseous and promotes **fruit ripening**?

  1. Auxin
  2. Cytokinin
  3. Ethylene (the 'ripening hormone')
  4. ABA
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Correct answer: C. Ethylene (the 'ripening hormone')

Ethylene (C₂H₄) — only gaseous plant hormone. Triggers fruit ripening (especially climacteric fruits like banana, mango, tomato), leaf abscission, flower senescence. Commercial banana ripening uses ethephon (releases ethylene).

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**Photoperiodism** refers to:

  1. Response of plants to gravity
  2. Response of plants to **day length** (light duration) — affecting flowering
  3. Response to soil temperature
  4. Response to water stress
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Correct answer: B. Response of plants to **day length** (light duration) — affecting flowering

**Photoperiodism:** plants flower in response to the relative duration of light and dark (day length). Garner & Allard (1920). **Three classes:** short-day plants (e.g. tobacco), long-day plants (e.g. spinach), day-neutral (e.g. tomato).

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