Topic 12 Practice Paper: Coordination, response and drugs — question paper

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1. 1

   The peripheral nervous system consists of

   1. Athe brain and spinal cord
   2. Brelay neurones only
   3. Cnerves outside the brain and spinal cord
   4. Dglands and their hormones
   ( )
2. 2

   Between the sensory neurone and the motor neurone in a reflex arc sits the

   1. Areceptor
   2. Brelay neurone
   3. Ceffector
   4. Dsynaptic vesicle
   ( )
3. 3

   Neurotransmitter molecules cross the synaptic gap by

   1. Aactive transport by vesicles
   2. Belectrical sparking
   3. Cdiffusion
   4. Dosmosis
   ( )
4. 4

   In dim light the pupil dilates because

   1. Athe lens becomes thinner
   2. Bthe retina pulls away
   3. Cthe ciliary muscles contract
   4. Dthe radial muscles of the iris contract
   ( )
5. 5

   The three kinds of cone in the retina give humans

   1. Acolour vision
   2. Bsharper hearing
   3. Cnight vision
   4. Da wider blind spot
   ( )
6. 6

   Adrenaline is secreted in fight-or-flight situations by the

   1. Aovaries
   2. Badrenal glands
   3. Ctestes
   4. Dpancreas
   ( )
7. 7

   Insulin lowers blood glucose by making the liver

   1. Arelease glucose from glycogen
   2. Bsecrete glucagon
   3. Cconvert glucose to glycogen for storage
   4. Dfilter urea faster
   ( )
8. 8

   Shivering helps raise body temperature because

   1. Asweat evaporates faster
   2. Bblood vessels narrow
   3. Chairs stand on end
   4. Drapid muscle contraction releases heat
   ( )
9. 9

   Auxin is produced in

   1. Athe shoot tip
   2. Bguard cells
   3. Cthe flower petals
   4. Dthe root caps only
   ( )
10. 10

    Bacteria resistant to antibiotics arise because

    1. Aantibiotics mutate the patient’s cells
    2. Bsome bacteria have resistance mutations that survive treatment
    3. Cviruses transfer drug recipes
    4. Dthe liver breaks antibiotics down
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1. 11

   The eye contains several structures that work together to produce sight.

   1. (a)

      State the function of the cornea and of the lens.

      [2]
   2. (b)

      Explain the pupil reflex when light intensity increases.

      [2]
   3. (c)

      Explain why an image focused on the blind spot cannot be seen.

      [2]
2. 12

   Blood glucose concentration is one of the body’s most tightly controlled variables. (Extended)

   1. (a)

      Define homeostasis.

      [1]
   2. (b)

      Name the hormones that lower and raise blood glucose, and the gland that secretes both.

      [3]
   3. (c)

      Explain how the liver responds to each hormone.

      [2]
   4. (d)

      State the treatment of Type 1 diabetes.

      [1]
3. 13

   Seedlings are grown in a window ledge box, with light entering from one side only. After a week, all the shoots have bent towards the window. (Extended)

   1. (a)

      Name this response.

      [1]
   2. (b)

      Describe the role of auxin in producing the bending.

      [4]
   3. (c)

      State the advantage to a seedling of bending towards light.

      [2]