Turn over 15 6 Fritillaria delavayi is a small plant (height 7 cm), that grows on rocky slopes on mountains in China. The image shows Fritillaria delavayi. bright green leaves bright yellow flower For at least 2 000 years, this plant has been collected and used in Chinese medicine. It is not known to be eaten by animals. In less accessible regions, where few humans go, the plants are bright green with bright yellow flowers. In locations where bulbs are collected in high numbers, most plants have greyish- brown leaves and flowers. Scientists believe that the greyish-brown plants are the same species as the brightly‑coloured plants. (a) Explain why most of the plants in areas where bulbs are collected in high numbers have greyish-brown leaves and flowers. 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(ii) Explain why the features of the brightly-coloured plants enable them to grow successfully in the areas where they are not collected by humans. 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(Total for Question 6 = 10 marks)