The diagram below shows a lima bean seedling. Several of its parts are labeled. A student plants the seedling in pot of soil. He observes the growth of the seedling and records his observations in his science notebook. Which description did the student record in his science notebook? (7.13A)   a Due to negative phototropism, part A grew upward.  b Due to negative geotropism, part C grew upward.  c Due to positive phototropism, part B grew downward.  d Due to positive geotropism, part C grew downward.

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