JAMB Biology questions: Growth

27 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Growth· JAMB

   In a root, the region of most active cell division is the

   • Aroot cap only
   • Broot hair zone
   • Ccortex
   • Droot tip (apical meristem)

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   Explanation and discussion

2. Question 22· Growth· JAMB

   Gibberellins promote

   • Aleaf fall
   • Bstem elongation and seed germination
   • Cfruit ripening only
   • Ddormancy

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   Explanation and discussion

3. Question 23· Growth· JAMB

   In plants, new cells are produced mainly in regions called

   • Ameristems
   • Bvacuoles
   • Cstomata
   • Dlenticels

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4. Question 24· Growth· JAMB

   The hormone that promotes cell elongation in plant shoots is:

   • Aauxin
   • Binsulin
   • Cadrenaline
   • Dthyroxine

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5. Question 25· Growth· JAMB

   Seeds kept in a sealed jar filled with boiled water fail to germinate. The most likely missing condition is

   • Awater
   • Boxygen
   • Cwarmth
   • Dlight

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6. Question 26· Growth· JAMB

   Complete metamorphosis in insects follows the sequence

   • Aegg, pupa, larva, adult
   • Begg, nymph, adult
   • Clarva, egg, pupa, adult
   • Degg, larva, pupa, adult

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7. Question 27· Growth· JAMB

   Gibberellins are plant hormones that promote

   • Aroot curvature towards gravity
   • Bfruit ripening
   • Cleaf fall
   • Dstem elongation and seed germination

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   Explanation and discussion