Biology · Question 241
Sperms are produced in the:
- Vas deferens
- Cowper's gland
- Seminiferous tubules
- Prostate gland
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Correct answer: C
Seminiferous tubules
Sperm develop in the seminiferous tubules of the testes.
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Biology · Question 242
Insulin is secreted by the:
- Beta cells of islets of Langerhans
- Liver cells
- Alpha cells of islets
- Cells of the adrenal gland
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Correct answer: A
Beta cells of islets of Langerhans
Pancreatic islet beta cells secrete insulin.
Biology · Question 243
Deficiency of vitamin C causes:
- Rickets
- Night blindness
- Scurvy
- Beriberi
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Correct answer: C
Scurvy
Vitamin C deficiency causes scurvy through impaired collagen formation.
Biology · Question 244
How many chambers does the human heart have?
- Five
- Four
- Two
- Three
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Correct answer: B
Four
The heart has two atria and two ventricles, making four chambers.
Biology · Question 245
Which vessel carries oxygenated blood from the lungs to the heart?
- Pulmonary artery
- Aorta
- Pulmonary vein
- Vena cava
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Correct answer: C
Pulmonary vein
Pulmonary veins return oxygenated blood from the lungs to the left atrium.
Biology · Question 246
Gaseous exchange in the lungs occurs in the:
- Pleura
- Alveoli
- Trachea
- Bronchi
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Correct answer: B
Alveoli
Gas exchange occurs across the thin alveolar-capillary barrier.
Biology · Question 247
Fertilization in humans normally occurs in the:
- Uterus
- Fallopian tube
- Ovary
- Vagina
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Correct answer: B
Fallopian tube
Fertilisation normally occurs in the uterine or fallopian tube, usually its ampulla.
Biology · Question 248
Which hormone is released from the posterior pituitary?
- Oxytocin
- TSH
- Prolactin
- Growth hormone
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Correct answer: A
Oxytocin
Oxytocin is synthesised in the hypothalamus and released from the posterior pituitary.
Biology · Question 249
How many chromosomes are normally present in a diploid human somatic cell?
- 48
- 44
- 23
- 46
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Correct answer: D
46
A typical diploid human somatic cell has 46 chromosomes in 23 pairs.
Biology · Question 250
Photosynthesis takes place in the:
- Nucleus
- Chloroplasts
- Ribosomes
- Mitochondria
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Correct answer: B
Chloroplasts
Photosynthesis occurs in chloroplasts in plant cells.