All Free Biology MCQs with Answers

• A. 5 microns
• B. 6 microns
• C. 7 microns
• D. 8 microns

Explanation: The correct answer is 8 microns. Human capillaries typically have a diameter of about 8 to 10 microns, which is just enough to allow red…

• A. 850mm/minute
• B. 900mm/minute
• C. 750mm/minute
• D. 730mm/minute

Explanation: Cerebral circulation refers to the flow of blood through the network of blood vessels supplying the brain.

• A. 1500 ml
• B. 1600 ml
• C. 1800 ml
• D. 1900 ml

Explanation: Skin blood flow plays a major role in the distribution of thermal energy during exercise.

• A. Arteriosclerosis
• B. Atherosclerosis
• C. Thrombosis
• D. Embolism

Explanation: Atherosclerosis is a condition that specifically involves the buildup of cholesterol and plaque on the artery walls, leading to thickening…

• A. Vasa vasorum
• B. Tunica media
• C. Tunica externa
• D. Tunica interna

Explanation: Vasa vasorum is a network of small blood vessels that supply oxygen and nutrients to the walls of larger blood vessels, such as arteries…

• A. Medulla oblongata
• B. Diencephalom
• C. Cerebrum
• D. Cerebellum

Explanation: The largest part of the brain, the cerebrum initiates and coordinates movement and regulates temperature.

• A. Hypothalamus
• B. Hippocampus
• C. Amygdala
• D. All of the above

Explanation: The limbic system is a complex network of brain structures located in the forebrain.

• A. Hypothalamus
• B. Cerebellum
• C. Medulla
• D. Midbrain

Explanation: Hunger centers, which regulate appetite and hunger, are primarily located in the hypothalamus of the brain.

• A. Thalamus
• B. Medulla oblongata
• C. Right cerebral hemisphere
• D. Left cerebral hemisphere

Explanation: The correct answer is the left cerebral hemisphere. This hemisphere is crucial for language and speech functions, containing key areas…

• A. Cerebrum
• B. Cerebellum
• C. Medulla
• D. Hypothalamus

Explanation: The cerebrum is the largest part of the brain and is responsible for processing and interpreting sensory information, including sound…

• A. Ivan Pavlov
• B. E.L. Thorndike
• C. Konrad Lorenz
• D. Wolfgang Köhler

Explanation: Edward Thorndike is the correct answer because he conducted experiments using puzzle boxes to study learning in animals.

• A. Diencephalon
• B. Myelencephalon
• C. Telencephalon
• D. Metencephalon

Explanation: The hypothalamus is a region of the forebrain located below the thalamus, forming the basal portion of the diencephalon.

• A. Pia mater and dura mater
• B. Pia mater and arachnoid mater
• C. Grey matter and pia mater
• D. Dura mater and grey mater

Explanation: Cerebrospinal fluid (CSF) is a clear, colorless liquid that fills and surrounds the brain and the spinal cord and provides a mechanical…

• A. 02 pairs
• B. 04 pairs
• C. 06 pairs
• D. 08 pairs

Explanation: The cranial nerves are a set of 12 paired nerves in the back of our brain.

• A. Psychosis
• B. Euphoria
• C. Paranoia
• D. Photophobia

Explanation: Cannabis is a plant that has uses as a recreational and medicinal drug. Psychosis is a symptom that involves a disconnection from reality.

• A. Alzheimer's disease
• B. Meningitis
• C. Cerebrovascular accident (CVA)
• D. Malignant

Explanation: The correct answer is Alzheimer's disease. Alzheimer's disease is a chronic neurodegenerative disease that typically starts slowly and…

• A. Hypothalamus
• B. Medulla oblongata
• C. Cerebellum
• D. Both B and C

Explanation: The swallowing procedure is actually regulated by nerves in both the cerebellum and the medulla oblongata.

• A. Brain stem
• B. Cerebellum
• C. Cortex
• D. Cerebral Hemispheres

Explanation: The telencephalon is the most anterior part of the brain and is responsible for higher cognitive functions such as perception, learning…

• A. Instinct
• B. Maturation
• C. Habituation
• D. Imprinting

Explanation: Habituation refers to the decrease in response to repeated or continuous stimulation.

• A. Operant learning
• B. Classical conditioning
• C. Insight
• D. Imprinting

Explanation: Trial and error learning, also known as operant conditioning, involves learning through repeated experiences and adjusting behavior based…