Plant Cell, Photosynthesis, Plant Parts
enter the cells of the leaf, and the products of photosynthesis, ..
For photosynthesis to occur, plants need: · Light energy from the sun · Chlorophyll to absorb light energy · Carbon dioxide from the atmosphere and from respiration in plant cells · Water which is absorbed by the roots and transported to the leaves by the xylem tubes....
A summary of Leaf in 's Plant Structures
Explore the upper epidermis; are there any stomates here? (Do not confuse an occasional pit gland with a stomate.) The stomate leads to a substomatal cavity that is continuous with the air spaces in the middle region of the leaf. The middle of the leaf contains photosynthetic tissue (mesophyll) interspersed with the vascular tissue of the veins. Look at the arrangement of the photosynthetic cells of the middle region of the leaf. Notice that the cells of the upper layer (the palisade mesophyll) are very close to each other while there are much more extensive air spaces among the cells of the lower layer (the spongy mesophyll).
are needed for the process of photosynthesis.
Plants get carbon dioxide from the air through their leaves. The carbon dioxide diffuses through small holes in the underside of the leaf called stomata. (singular: stoma. plural: stomata)
The lower part of the leaf has loose-fitting cells, to allow carbon dioxide to reach the other cells in the leaf. This also allows the oxygen produced in photosynthesis to leave the leaf easily.
Carbon dioxide is present in the air we breathe, at very low concentrations. Even though it forms about .04% of the air, it is a needed factor in light-independent photosynthesis.
In higher concentrations, more carbon is incorporated into carbohydrate, therefore increasing the rate of photosynthesis in light-independent reactions.
A typical plant cell contains about 10 ..
The function of a leaf is photosynthesis – to absorb light and carbon dioxide to produce carbohydrates. The equation for photosynthesis is: