Which of the following correctly states the roles of the xylem and guard cells in the process of photosynthesis?

Plants convert energy from sunlight into sugar in a process called photosynthesis each plant contains a branched system of tubes called xylem which is responsible for water transport from the roots (where it is taken up) to the leaves (where it is used in photosynthesis).

If the allele for curly hair is incompletely dominant and a mother is homozygous for curly hair and the father is homozygous for straight hair, the percentage of the offspring that will exhibit characteristics of both parents is 100%. 

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