(a)[4]
Using the information in Fig. 2.1, describe the differences in the distribution of rods and cones.
(b)[2]
Nocturnal animals are active during the night. Suggest how the number of receptor cells in the retina of a nocturnal animal differs from that in the retina of an animal active during the day. Explain your suggestion.
(c(i))[1]
State the name given to this response.
(c(ii))[1]
State the name of the effector that contracts during this response.
(c(iii))[1]
State the name of the type of action shown by the paired effectors during this response.
(d(i))[3]
State the names of the structures labelled A, B and C in Fig. 2.2.
(d(ii))[2]
Explain how part C in Fig. 2.2 travels across the synaptic gap.