Which of the following does not require expenditure of energy?
A. flow of sucrose and other carbohydrates once inside the sieve tubes
B. opening or closing stomata
C. accumulation of ions inside a cell
D. the loading and unloading of carbohydrates from the sieve tubes
E. transport against a concentration gradient
Answer: A
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From the outside of a flower to the inside, which of the following is the correct order of structures?
a. calyx>corolla>stamen>carpel b. corolla>calyx>stamen>carpel c. calyx>corolla>carpel>stamen d. corolla>calyx>carpel>stamen e. calyx>carpel>corolla>stamen
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