Humans detect the sweet taste of sucrose sugar using chemoreceptor cells in taste buds on the tongue. The red admiral butterfly, Vanessa atalanta, detects sucrose using chemoreceptor cells located on its antennae and on its tarsi (feet). The mode of action of the chemoreceptors in V. atalanta is similar to that in humans. Fig. 10.1 shows the locations of the chemoreceptor cells on $$$V$$$. atalanta. Fig. 10.1 Describe how the presence of sucrose causes an action potential in the sensory neurone associated with a chemoreceptor cell in V. atalanta. ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ................................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_41 Year：2024 Question No：10

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15.2.1 describe the rapid response of the Venus fly trap to stimulation of hairs on the lobes of modified leaves and explain how the closure of the trap is achieved

15.2.2 explain the role of auxin in elongation growth by stimulating proton pumping to acidify cell walls

15.2.3 describe the role of gibberellin in the germination of barley (see 16.3.4)

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