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Plant structures and functions GapFill
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Like animals, plants are made from a number of different tissues, each adapted differently for its varying functions. The tissues of plants line the outside of the plant. They are often waxy and work to the cells. If a part of a plant is active in performing photosynthesis, it will have a lot of - these cells are packed full of . Beneath this tissue layer, there is often with large air spaces to increase concentration gradients of gases for the plant.
Transpiration (the movement of water out of the leaves of plants) can be affected by a number of environmental factors, including change in temperature, humidity, air movement and . When moving water, root hair cells absorb water by a process known as osmosis. Minerals are absorbed by , and hollow xylem tubes allow water to form a continuous chain through the plant to the leaves.
Plants produce hormones, though they do not have glands as animals do. They use the hormones to control their and how they coordinate themselves. The hormone auxin causes unequal growth rates in roots and due to uneven distribution across the plant. This hormone is responsible for the response to light, known as . The response to gravity is known as . Auxin has many uses in agriculture and horticulture, including as a killer and a rooting powder.
Ethene is important in plant cell division, and is commonly used to control while fruit is being stored or transported. Gibberellins also play a vital role in the process of seed and are often used commercially to ensure and fruits grow large.