JAMB Biology past questions and answers

1. Question 1

   JAMB 2024Classification

   Which of the following animals is an amphibian?

   1. AOption A: hen
   2. BOption B: chameleon
   3. COption C: tilapia
   4. DOption D: newt
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   Answer: D, newt

   The newt is an amphibian (class Amphibia).

2. Question 2

   JAMB 2024Excretion and respiration

   In humans, gaseous exchange takes place in the

   1. AOption A: trachea
   2. BOption B: alveoli
   3. COption C: bronchi
   4. DOption D: larynx
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   Answer: B, alveoli

   The alveoli have thin, moist walls for exchange.

3. Question 3

   JAMB 2024Nutrition

   Most digestion and absorption of food takes place in the

   1. AOption A: stomach
   2. BOption B: large intestine
   3. COption C: oesophagus
   4. DOption D: small intestine
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   Answer: D, small intestine

   The ileum completes digestion and absorbs food.

4. Question 4

   JAMB 2024Genetics

   In pea plants, the allele for tall (T) is dominant over the allele for short (t). What is the expected phenotypic ratio of the offspring of a cross between Tt and tt parents?

   1. AOption A: 1 tall : 1 short
   2. BOption B: 3 tall : 1 short
   3. COption C: All tall
   4. DOption D: All short
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   Answer: A, 1 tall : 1 short

   Tt × tt gives equal numbers of Tt and tt: 1 : 1.

5. Question 5

   JAMB 2024Reproduction

   Which of these seeds has one cotyledon?

   1. AOption A: Bean
   2. BOption B: Maize
   3. COption C: Groundnut
   4. DOption D: Cowpea
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   Answer: B, Maize

   Maize is a monocotyledon.

6. Question 6

   JAMB 2023Excretion and respiration

   Flatworms such as Planaria excrete through

   1. AOption A: nephridia
   2. BOption B: flame cells
   3. COption C: Malpighian tubules
   4. DOption D: kidneys
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   Answer: B, flame cells

   Flame cells remove waste in flatworms.

7. Question 7

   JAMB 2023Reproduction

   In humans, fertilisation normally takes place in the

   1. AOption A: uterus
   2. BOption B: vagina
   3. COption C: oviduct
   4. DOption D: ovary
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   Answer: C, oviduct

   Sperm meet the ovum in the oviduct (fallopian tube).

8. Question 8

   JAMB 2023Nutrition

   Which enzyme is found in saliva?

   1. AOption A: Pepsin
   2. BOption B: Trypsin
   3. COption C: Ptyalin
   4. DOption D: Lipase
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   Answer: C, Ptyalin

   Ptyalin (salivary amylase) starts starch digestion in the mouth.

9. Question 9

   JAMB 2023Genetics

   In fruit flies, the allele for normal wings (N) is dominant over the allele for vestigial wings (n). What is the expected phenotypic ratio of the offspring of a cross between Nn and Nn parents?

   1. AOption A: 1 normal wings : 1 vestigial wings
   2. BOption B: 3 normal wings : 1 vestigial wings
   3. COption C: All normal wings
   4. DOption D: All vestigial wings
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   Answer: B, 3 normal wings : 1 vestigial wings

   Nn × Nn gives three offspring with at least one N to every nn: 3 : 1.

10. Question 10

    JAMB 2023Classification

    Which of the following animals is a reptile?

    1. AOption A: tortoise
    2. BOption B: dolphin
    3. COption C: hen
    4. DOption D: caecilian
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    Answer: A, tortoise

    The tortoise is a reptile (class Reptilia).

More Biology: WAEC Biology past questions.