JAMB Biology questions

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

1. Question 201· Growth· JAMB

   The plant hormone that promotes the ripening of fruits is

   • Aauxin
   • Bethylene
   • Cgibberellin
   • Dcytokinin

   Show answer

   Explanation and discussion

2. Question 202· Growth· JAMB

   A period during which a viable seed does not germinate even under suitable conditions is called

   • Agermination
   • Bdormancy
   • Cpollination
   • Dmetamorphosis

   Show answer

   Explanation and discussion

3. Question 203· Growth· JAMB

   In humans, growth hormone is produced by the

   • Apituitary gland
   • Bthyroid gland
   • Cadrenal gland
   • Dpancreas

   Show answer

   Explanation and discussion

4. Question 204· Growth· JAMB

   During germination, the radicle develops into the

   • Ashoot
   • Broot
   • Cleaf
   • Dseed coat

   Show answer

   Explanation and discussion

5. Question 205· Growth· JAMB

   An insect such as the cockroach, which develops through egg, nymph and adult stages, shows

   • Ano metamorphosis
   • Bcomplete metamorphosis
   • Cincomplete metamorphosis
   • Dbudding

   Show answer

   Explanation and discussion

6. Question 206· Growth· JAMB

   Growth in animals can be measured by changes in

   • Asmell
   • Bcolour
   • Cmass or length over time
   • Dbehaviour

   Show answer

   Explanation and discussion

7. Question 207· Growth· JAMB

   Moulting and metamorphosis in insects are controlled by

   • Anerves only
   • Blight only
   • Ctemperature only
   • Dhormones such as ecdysone

   Show answer

   Explanation and discussion

8. Question 208· Growth· JAMB

   Which seed shows hypogeal germination?

   • Agroundnut
   • Bbean
   • Cmaize
   • Dcastor

   Show answer

   Explanation and discussion

9. Question 209· 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)

   Show answer

   Explanation and discussion

10. Question 210· Growth· JAMB

    Gibberellins promote

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

    Show answer

    Explanation and discussion

11. Question 211· Growth· JAMB

    In plants, new cells are produced mainly in regions called

    • Ameristems
    • Bvacuoles
    • Cstomata
    • Dlenticels

    Show answer

    Explanation and discussion

12. Question 212· Growth· JAMB

    The hormone that promotes cell elongation in plant shoots is:

    • Aauxin
    • Binsulin
    • Cadrenaline
    • Dthyroxine

    Show answer

    Explanation and discussion

13. Question 213· 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

    Show answer

    Explanation and discussion

14. Question 214· Growth· JAMB

    Complete metamorphosis in insects follows the sequence

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

    Show answer

    Explanation and discussion

15. Question 215· Growth· JAMB

    Gibberellins are plant hormones that promote

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

    Show answer

    Explanation and discussion

16. Question 216· Heredity and variation· JAMB

    Colour blindness is commoner in males because the gene is

    • Adominant
    • Bcarried only on the Y chromosome
    • Crecessive and carried on the X chromosome
    • Don an autosome

    Show answer

    Explanation and discussion

17. Question 217· Heredity and variation· JAMB

    What genotypes are possible among the children of an AS father and an AA mother?

    • ASS only
    • BAS and SS
    • CAA only
    • DAA and AS

    Show answer

    Explanation and discussion

18. Question 218· Heredity and variation· JAMB

    The number of chromosomes in a normal human body cell is:

    • A46
    • B44
    • C23
    • D48

    Show answer

    Explanation and discussion

19. Question 219· Heredity and variation· JAMB

    Two parents both have blood group A with genotype AO. What is the probability that their child has blood group O?

    • A¼
    • B½
    • C¾
    • D0

    Show answer

    Explanation and discussion

20. Question 220· Heredity and variation· JAMB

    A couple already has three daughters. What is the probability that their fourth child will be a boy?

    • A¾
    • B¼
    • C½
    • D1/16

    Show answer

    Explanation and discussion