AP BIOLOGY

Detailed explanation-1: -Water is another important material plants need to grow, and they get it by absorbing it through their roots. Water is made of two hydrogen atoms and one oxygen atom. The hydrogen in water is used to help build glucose molecules. A plant can be up to 95% water.

Detailed explanation-2: -The stem conducts water and nutrient minerals from their site of absorption in the roots to the leaves by means of certain vascular tissues in the xylem. The movement of synthesized foods from the leaves to other plant organs occurs chiefly through other vascular tissues in the stem called phloem.

Detailed explanation-3: -Plants have two transport systems-xylem and phloem . Xylem transports water and minerals. Phloem transports sugars and amino acids dissolved in water.

Detailed explanation-4: -Stems carry water and nutrients taken up by the roots to the leaves. Then the food produced by the leaves moves to other parts of the plant. The cells that do this work are called the xylem cells. They move water.