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Biology Grade 12 Unit 5: HUMAN BODY SYSTEM

47 national exam questions have come from this unit. It runs 97 pages; one careful study pass takes about 6.3 hours, and its difficulty is easier among Biology units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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5.1 The Nervous System · read p. 237
  • 2017 E.C., Q79 – Which one of the following statements is correct about nervous system? It
5.1.1 Neurons and their functions · read p. 240
  • 2018 E.C., Q15 – What is the primary role of neurotransmitters at a synapse?
  • 2016 E.C., Q7 – Which one of the following options is a constituent of peripheral nervous system?
  • 2016 E.C., Q8 – Which one of the following structures of neurons is correctly paired with its function?
  • 2016 E.C., Q9 – Which one of the following statements explains how nerve impulse is occurred?
  • 2014 E.C., Q61 – The nerve impulse is transmitted from one neuron to another by a neurotransmitter at the
5.1.2 The Nerve Impulse and transmission · read p. 246
  • 2017 E.C., Q80 – What is the best justification for the role of voltage-gated ion channels in nerve impulse transmission? They
  • 2017 E.C., Q81 – Which one of the following ions are used to facilitate the release of neurotransmitters to the synaptic cleft before binding to postsynaptic receptor?
  • 2016 E.C., Q10 – Which one of the following statements is an acceptable justification of importance of synapse? Synapse is
  • 2015 E.C., Q3 – In the nervous co-ordination system, which of the following statements explains the synapse? It is a
  • 2015 E.C., Q6 – Which one of the following descriptions of proteins is correctly matched with its function in a cell membrane?
  • 2014 E.C., Q62 – What happens if the axon is stimulated? Formation of
  • 2009 E.C., Q29 – Fore a substance to easily pass arose the cell membrane by simple diffusion which of the following properties should it possess?
5.1.3 Neurotransmitters · read p. 252
Not asked in a national paper yet.
5.1.4 Types of the nervous system · read p. 253
Not asked in a national paper yet.
5.1.6 Reflex action · read p. 262
  • 2017 E.C., Q82 – Find the correct path way of reflex arc that prevents you from physical damage upon the sudden touching of hot plate.
  • 2015 E.C., Q4 – Two students want to demonstrate a simple spinal reflex action using the knee jerk reflex. One of them sits down with one leg loosely crossed over the other. The other hits the crossed leg just below the knee cap gently
  • 2014 E.C., Q63 – Assume you wanted to demonstrate a simple reflex action using the knee jerk reflex. You asked a friend to sit with one leg crossed over the other. Which one of the following indicates the correct demonstration?
  • 2009 E.C., Q49 – Which of the following organs serves as a coordinating system in a reflex action?
  • 2009 E.C., Q47 – A reflex that involves internal organs such as the heart is referred to as:
  • 2005 E.C., Q78 – Which of the following is the correct route that connects a stimulus and a response?
5.1.7 Drug abuse · read p. 268
Not asked in a national paper yet.
5.2 Sense organs · read p. 273
Not asked in a national paper yet.
5.2.1 Skin · read p. 274
  • 2018 E.C., Q18 – Which of the following is a function of the epidermis layer of the skin?
  • 2016 E.C., Q31 – What is the main function of the dermis of the skin?
  • 2015 E.C., Q78 – What is the function of dermis of the skin? It
5.2.2 The Tongue · read p. 278
Not asked in a national paper yet.
5.2.3 The Nose · read p. 280
Not asked in a national paper yet.
5.2.4 The Eye · read p. 281
  • 2018 E.C., Q17 – Which of the following conditions can be corrected using concave (diverging) lenses?
  • 2017 E.C., Q84 – This item is based on the following diagram of anatomy of human eye. Which labeled part is responsible for controlling the diameter of the pupil according to the light source? Question Diagram
  • 2016 E.C., Q32 – The part of the eye represented by letter 'Y' is
  • 2015 E.C., Q5 – Which one of the following eye structures is correctly matched with its function?
  • 2014 E.C., Q17 – Which student designed the most appropriate experiment?
  • 2014 E.C., Q18 – Short-sightedness is corrected by a concave lens because the problem arises due to a
  • 2014 E.C., Q16 – During image formation, light is refracted twice before it is focused on the retina. This phenomenon happens at the
5.2.5 The Ear · read p. 291
  • 2017 E.C., Q85 – Select the option that contains the correct match of human ear structure and its function.
  • 2017 E.C., Q88 – This item is based on the following list of events that happen during hearing. I. Transmission of amplified sound waves to the ear ossicles II. Movement of sensory hair as a result of vibration of the fluid in the cochle
  • 2016 E.C., Q33 – A man observed elementary school students spinning around, and realized that none of them could properly walk upright after sudden interruption of the spinning. Which one of the following is the correct reason for this c
  • 2015 E.C., Q79 – Children who play by spinning round and round fast, when they stop, they feel dizzy. Why?
  • 2014 E.C., Q65 – What is the name of the human ear part represented by letter 'F' in the above diagram?
5.2.6 The endocrine system · read p. 295
  • 2018 E.C., Q19 – Which of the following is a primary function of insulin in the body?
  • 2017 E.C., Q93 – Assume a patient with type II diabetes gets an advice to practice regular exercise to raise the number of insulin receptors. Then, how does insulin regulate the blood glucose level if it is high in this patient? It stimu
  • 2017 E.C., Q89 – Suppose low metabolic rate, cretinism and retarded mental and physical development are common problems of infants and childhood in a small village. Which condition in the endocrine system results in these problems?
  • 2017 E.C., Q90 – If a woman is admitted to hospital for giving birth, which hormone is helping her in the delivery of her baby and releasing of milk?
  • 2016 E.C., Q34 – Which of the following is the correct description of hormones? They are chemical messengers that
  • 2014 E.C., Q19 – A patient exhibited symptoms of weight loss, sweating, and irritability and the doctor suspected an endocrine malfunction that can be related to the
  • 2014 E.C., Q20 – Secretions of endocrine glands require receptors on cell membrane to be picked by their targets while exocrine secretions do not. This is because
  • 2007 E.C., Q81 – Which hormone promotes human sleepfulness in darkness and controls the sleep-wake cycle?
5.3 Homeostasis in the human body · read p. 317
Not asked in a national paper yet.
5.3.1 The structure and function of the human kidney · read p. 317
  • 2017 E.C., Q92 – How ultrafiltration takes place in the human kidney? By
  • 2017 E.C., Q94 – Imagine the water content of the blood is low when you take in much salt with your food. What would happen in your kidney to regulate this situation? Osmoreceptor stimulates the
  • 2016 E.C., Q46 – Which one of the following is the main function of Bowman's capsule of the human kidneys?
  • 2014 E.C., Q79 – What will happen if the water content of the blood is too high?
  • 2013 E.C., Q66 – A student did an experiment and found out that catabolism of amino acid produces toxic ammonia in the liver cells which gradually get converted into urea and excreted through urine. What would be the result of the experi