All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19,844 questions · page 932 of 993
- A. Lymphocytes
- B. Monocyte
- C. Eosinophils
- D. Basophils
Explanation: Option [A] Lymphocytes are the agranulocytes .They create antibodies to fight against bacteria, viruses, and other potentially harmful…
Correct answer: Monocyte- A. External pressure applied becomes greater than the systolic pressure
- B. External pressure applied is equal to systolic pressure
- C. External pressure applied is less than the systolic pressure
- D. External pressure applied is zero
Explanation: The correct answer is A. External pressure applied becomes greater than the systolic pressure.
Correct answer: External pressure applied becomes greater than the systolic pressure- A. Prothrombin
- B. Fibrinogen
- C. Immunoglobulin
- D. Globulin
- E. Both A and B
Explanation: Prothrombin is a protein made by the liver. Prothrombin helps blood to clot.
Correct answer: Both A and B- A. Aorta
- B. Arteries
- C. Veins
- D. Both options A and B
Explanation: The elastic fibres are essential in the recoil and the stretch of the blood vessel in order to survive high blood pressure.
Correct answer: Veins- A. Arteries
- B. Capillaries
- C. Veins
- D. Arterioles
Explanation: Valves in veins are one-way(semi lunar) flaps that help prevent blood from flowing backward in the circulatory system.
Correct answer: Veins- A. Heart directly
- B. Pre-capillary sphincters
- C. Meta-arterioles
- D. Valves
Explanation: The flow of blood in the capillaries is primarily adjusted by pre-capillary sphincters, which regulate the entry of blood into the…
Correct answer: Pre-capillary sphincters- A. iliac vein
- B. iliac artery
- C. temporal artery
- D. Sciatic artery
Explanation: The descending aorta is bifurcated into two vessels called the common iliac arteries (Option B).
Correct answer: iliac artery- A. Midbrain.
- B. Medulla.
- C. Pons.
- D. Cerebellum.
Explanation: Medulla controls several automatic functions, such as breathing, heart rate, blood pressure and swallowing.
Correct answer: Medulla.- A. Alzheimer's disease.
- B. Epilepsy.
- C. Parkinson's disease.
- D. None of these.
Explanation: Alzheimer's disease is a brain disorder that slowly destroys memory and thinking skills and eventually the ability to carry out the…
Correct answer: Alzheimer's disease.- A. Bulimia nervosa.
- B. Anorexia nervosa.
- C. Dyspepsia.
- D. Salmonella.
Explanation: Bulimia nervosa, also known as simply bulimia, is an eating disorder characterized by binge eating followed by purging; and excessive…
Correct answer: Bulimia nervosa.- A. Biological rhythms, territorial, courtship and development
- B. The responses that do produce same result in different conditions
- C. Aggression, mating and altruism
- D. The responses that are predetermined like differentiation
Explanation: A is incorrect because development is not a type of reflexes and instincts.B is incorrect because reflexes and instincts are extremely…
Correct answer: Aggression, mating and altruism- A. Cerebrum
- B. Cerebellum
- C. Medulla
- D. Hypothalamus
Explanation: The medulla is responsible for, among other things, the controlling of involuntary activities, such as heartbeat, respiration, etc.
Correct answer: Medulla- A. Epilepsy
- B. Parkinson's Disease
- C. Alzheimer's Disease
- D. Huntington's Disease
Explanation: Epilepsy is a neurological disorder characterized by unpredictable and recurrent seizures.
Correct answer: Epilepsy18634. The part of the hind brain responsible for the balance and equilibrium of the body is called:
- A. Medulla
- B. Cerebellum
- C. Pons
- D. Thalamus
Explanation: The cerebellum is important in maintaining body position, and balance and coordinating movements of the body.
Correct answer: Cerebellum- A. Lumbar vertebrae
- B. Coccyx
- C. Vertebral column
- D. Cranium
Explanation: Cranium, which is a part of the skull is made up of 8 bones to form a brain box to protect the brain.
Correct answer: Cranium- A. Fever
- B. Alzheimer's Disease
- C. Epilepsy
- D. Parkinson's Disease
Explanation: Parkinson's disease is caused by the loss of brain cells; these cells are associated with the release of dopamine.
Correct answer: Parkinson's Disease- A. Parkinson's Disease
- B. Epilepsy
- C. Alzheimer's Disease
- D. Diabetes
Explanation: Alzheimer's disease is a neurological disorder characterized by a progressive decline in cognitive function, memory loss, and difficulty…
Correct answer: Alzheimer's Disease- A. Meningitis
- B. Alzheimer's Disease
- C. Epilepsy
- D. Parkinson's sensory
Explanation: A key point in this MCQ is chaotic activity in the motor AND SENSORY areas, which gives a meaning to seizures.
Correct answer: Epilepsy18639. The CNS is protected by:
- A. Three layers of meninges
- B. One layer of moninx
- C. 4 layers of meninges
- D. 2 layers of meninges
Explanation: The CNS is covered with three layers of protective coverings called meninges.
Correct answer: Three layers of meninges- A. Parkinson's disease
- B. Alzheimer's disease
- C. Lesch-Nyhan syndrome
- D. Fragile X-syndrome
Explanation: There is evidence that high levels of aluminium may contribute to the onset of Alzheimer's disease.
Correct answer: Alzheimer's disease