(a)[2]
What is meant by the term sense organ?
(b(i))[1]
Use Fig. 2.1 to draw a label line and place a letter X to show a motor neurone.
(b(ii))[3]
Describe how events at a synapse lead to an impulse being produced in the next neurone.
(b(iii))[4]
Describe and explain accommodation in the eye when a near object is viewed. Refer to the letters in Fig. 2.1 in your answer.
(c)[4]
Describe the distribution and roles of rods and cones in the eye.
(d(i))[1]
State the word used for an alternative form of a gene.
(d(ii))[1]
State the genotype of a male who has colour blindness.