Biology

Lets see if what I studied earlier today stayed inside or not.

Upper layer of a leaf's epidermis is thin and transparent to allow light to reach the palisade mesophyll cells. The palisade mesophyll cells are arranged upright and are found in large numbers right below the upper epidermis of the leaf for maximum light absorption. Palisade mesophyll cells have a lot of chloroplast. Right below are the spongy mesopyll cells. The spongy mesophyll cells are loosely placed and there are large air spaces in between the cells. This allows the palisade mesophyll cells to be constantly surrounded by air so that photosynthesis can take place. Below the spongy mesophyll cells are the guard cells, stomata and lower epidermis. Guard cells control the opening and closing of the stomata to allow air to diffuse into the leaf. They regulate the rate of transpiration of a plant. Stomata are small pores in a leaf, usually located at the lower epidermis for land plants, and all around the plants in submerged plants.