10 questions from the JAMB 2025 Biology paper, with answers and explanations. Tap "Show answer" under each one when you are ready.
JAMB 2025Question 1 · Animal Biology and Comparative Physiology
The mouthpart of the mosquito, which is adapted for piercing skin and sucking liquid food, is called the
A.proboscis
B.mandible
C.labellum
D.maxilla
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Answer: A. proboscis
The mosquito's proboscis is a slender, needle-like mouthpart adapted for piercing and sucking fluids.
JAMB 2025Question 2 · Animal Biology and Comparative Physiology
Which endocrine gland, located at the base of the brain, is often referred to as the 'master gland' because it controls the secretion of several other endocrine glands?
A.thyroid gland
B.adrenal gland
C.pituitary gland
D.parathyroid gland
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Answer: C. pituitary gland
The pituitary gland regulates the activity of many other endocrine glands and is therefore called the master gland.
JAMB 2025Question 3 · Animal Biology and Comparative Physiology
In humans, the type of teeth specially adapted for tearing food is the
A.incisor
B.canine
C.premolar
D.molar
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Answer: B. canine
Canines are pointed teeth adapted for gripping and tearing food.
JAMB 2025Question 4 · Animal Biology and Comparative Physiology
Which organ in the human digestive system produces bile, which helps in the emulsification of fats?
A.pancreas
B.liver
C.stomach
D.small intestine
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Answer: B. liver
The liver produces bile, which is stored in the gall bladder and released to emulsify fats in the small intestine.
JAMB 2025Question 5 · Cell Biology and Biochemistry
Which cell organelle contains the chromosomes and controls the cell's hereditary characteristics?
A.mitochondrion
B.ribosome
C.Golgi body
D.nucleus
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Answer: D. nucleus
The nucleus houses the chromosomes (DNA) and controls the hereditary characteristics and activities of the cell.
JAMB 2025Question 6 · Cell Biology and Biochemistry
Which of the following best describes the function of the nucleus in a cell?
A.it produces energy for cellular activities
B.it synthesizes proteins on its surface
C.it transports materials within the cell
D.it controls and coordinates the activities of the cell
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Answer: D. it controls and coordinates the activities of the cell
The nucleus contains the genetic material and acts as the control centre, coordinating cellular activities.
JAMB 2025Question 7 · Classification
In the gastropod (snail), the hard, spirally-coiled structure that protects the soft body is called the
A.foot
B.mantle
C.shell
D.radula
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Answer: C. shell
The snail's shell is a hard, spirally-coiled structure secreted by the mantle that protects its soft body.
JAMB 2025Question 8 · Genetics and Evolution
A pea plant heterozygous for seed shape (Rr, round) is self-pollinated. What is the expected genotypic ratio of the offspring?
A.2:1:1
B.3:1
C.1:1
D.1:2:1
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Answer: D.1:2:1
Crossing Rr×Rr gives offspring genotypes RR:Rr:rr in the ratio 1:2:1.
JAMB 2025Question 9 · Plant Biology
The part of a flower that is usually brightly coloured and scented, and functions mainly to attract pollinating insects, is the
A.sepal
B.petal
C.stamen
D.carpel
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Answer: B. petal
Petals (collectively the corolla) are typically brightly coloured and scented to attract pollinators.
JAMB 2025Question 10 · Reproduction and Nutrition
The part of the female reproductive system where a fertilized egg implants and the foetus develops is the
A.cervix
B.vagina
C.uterus
D.ovary
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Answer: C. uterus
The uterus (womb) is where implantation occurs and the foetus develops during pregnancy.
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