Get access to the common mistakes students make in their A-Level
physics exams. Inspired by The Examiner's reports this is an un-
missable opportunity to find out where precious marks are
dropped. The leaves are the part of a plant where most
photosynthesis takes place. If you cut a leaf in half and look
at the cut end you will see something like this: - Waxy cuticle,
this gives the leaf a waterproof layer, which lets in light. -
Upper epidermis - provides an upper surface. - Palisade cells,
which are packed full of chloroplasts. - Spongy mesophyll.
Collection of damp, loosely packed cells. - Lower epidermis is
the layer of cells on the lower surface. - Air space inside the
leaf, allows contact between air and moist cell surfaces. -
Stoma, a hole in the leaf which gases diffuse through. - Guard
cells, which change shape to close the stoma. See the section on
for more details on plant structure. One amazing feature of
leaves is that they have tiny holes in them to let the gases
carbon dioxide and oxygen enter a