AP BIOLOGY

Detailed explanation-1: -Leaves are ideal for photosynthesis because they are usually broad and flat, giving plenty of surface area for light to be absorbed. They are also thin, which means diffusion of gases such as carbon dioxide can happen quickly.

Detailed explanation-2: -Nodes. A node is an area on a stem where buds are located (figure 6). It is a site of great cellular activity and growth. It is here that small buds develop into leaves, stems or flowers. When pruning, it is important to locate a plant’s nodes.

Detailed explanation-3: -Plant photosynthesis occurs in leaves and green stems within specialized cell structures called chloroplasts. One plant leaf is composed of tens of thousands of cells, and each cell contains 40 to 50 chloroplasts.

Detailed explanation-4: -The leaf is a lateral, generally flattened structure borne on the stem. It develops at the node and bears a bud in its axil. The axillary bud later develops into a branch. Leaves originate from shoot apical meristems and are arranged in an acropetal order.