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Plant tissues, organs and systems Typeit
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Plants are made up of cells arranged into collections of called organs, which each perform a special function in the organism. For example, one plant organ is the leaf. The mesophyll contains cells with lots of chloroplasts for photosynthesis, and the mesophyll is less tightly packed, with pores called for gas exchange. The opening and closing of these pores is controlled by cells, which allows the plant to tightly regulate the amount of water that is lost through the leaves in different conditions. The epidermis is the transparent outer layer of cells in a plant which allows to pass through it for photosynthesis.
The leaves work together with the roots and the stem as an for transporting materials around the plant. For example, the movement of water through a plant is called . Water is taken up by the roots through osmosis and travels in the , which is made up of dead cells stacked in long tubes and strengthened by . The root hair cells take up mineral ions by and have a large surface area to do this. is the movement of sugars around a plant in the tissue called the , made up of elongated cells. This movement of sugars is either from the to parts of the plant that are respiring and require glucose, or to parts of the plant that can store sugars for later use.