Document page
biology 0610printed 176 · PDF 176
328 pagesrevision 46933
printed 176 · PDF 176
Page image rendered from the stored file at 110 dpi; it sharpens as you zoom. Outlines are placed from each region’s stored position on the page (612 × 792 pt).
no text layerread by OCR (tesseract5-eng@250dpi)The text layer was unusable, so the page image was read by OCR. OCR text can contain misread characters.
Source of this text: read by OCR. The better of the embedded text and OCR is kept.
1 Describe sense organs as groups of receptor cells
responding to specific stimuli: light, sound, touch,
temperature and chemicals
Identify in diagrams and images the structures of
the eye, limited to: cornea, iris, pupil, lens, retina,
optic nerve and blind spot
Describe the function of each part of the eye,
limited to:
(a) comea - refracts light
(b) iris - controls how much light enters the
pupil
(c)_ lens - focuses light on to the retina
(d) retina - contains light receptors, some
sensitive to light of different colours
(e) optic nerve — carries impulses to the brain
Explain the pupil reflex, limited to changes in
176
Supplement
Explain the pupil reflex in terms of the
antagonistic action of circular and radial muscles
in the iris
Explain accommodation to view near and distant
objects in terms of the contraction and relaxation
of the ciliary muscles, tension in the suspensory
ligaments, shape of the lens and refraction of
light
Describe the distribution of rods and cones in the
retina of a human
Outline the function of rods and cones, limited
to:
(a) greater sensitivity of rods for night vision
of different colours, for colour vision
Identify in diagrams and images the position of
the fovea and state its function