O-LevelBiologyCoordination & Response5090/21 · Oct/Nov 2015 · Q710 Marks
A person looks up from focusing on a near object to focus on an object further away. Describe how changes that take place in named components of the person's eye produce a focused image of the distant object.
- (a)A person looks up from focusing on a near object to focus on an object further away. Describe how changes that take place in named components of the person's eye produce a focused image of the distant object.[6]
- (b)Suggest why these changes that take place in the eye are controlled by the nervous system, rather than by a hormone.[4]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [max. 6] (a) ciliary muscles ;
- [max. 6] (a) relax;
- [max. 6] (a) suspensory ligaments ;
- [max. 6] (a) tighten/become taut/pulled AW;
- [max. 6] (a) increased tension/pull on lens ;
- [max. 6] (a) lens long + thin/flatter/less fat/convex;
- [max. 6] (a) light refracted/bent (by lens);
- [max. 6] (a) (light) converges/(produces image) on retina/fovea ;
- [max. 4] (b) nervous system quicker AW/hormones slower ;
- [max. 4] (b) example of relevant situation;
- [max. 4] (b) electrical/impulses ;
- [max. 4] (b) via neurones/nerve cells;
- [max. 4] (b) hormones are chemical;
- [max. 4] (b) carried/transported via blood;
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