A food scientist carries out two tests on a volunteer. In test 1, a few grains of sugar are placed on the volunteer's tongue. In test 2, a warm lamp is held a few centimetres from the back of the volunteer's hand without touching it.
Which option identifies the stimulus detected by the receptors in each test?
test 1: chemicals carried in the air; test 2: temperature
test 1: chemicals dissolved in saliva; test 2: temperature
test 1: chemicals carried in the air; test 2: light
test 1: chemicals dissolved in saliva; test 2: light
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.