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绿色植物

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1091
Word Definition Topic
capillarity the tendency of water to move up a narrow tube - the effect of water molecules clinging to each other and clinging to the sides of the tube Green plants as organisms
chlorophyll the green chemical inside the chloroplasts of plant cells. It enables photosynthesis to take place. Green plants as organisms
evaporation the process in which a liquid turns into a gas Green plants as organisms
flaccid lacking turgor; lacking in stiffness or strength Green plants as organisms
guard cells specialised cells which control the opening and closing of stomata in a green plant's leaves Green plants as organisms
impermeable not allowing water to pass through Green plants as organisms
light energy energy in the form of light (from the sun). It is needed for photosynthesis, which changes light energy into chemical energy. Green plants as organisms
lignin a hard cellulose-like substance which gives rigidity to plant tissues Green plants as organisms
limiting factor Something which prevents or slows down a process. Temperature, carbon dioxide concentration and light intensity can all be limiting factors on photosynthesis. Green plants as organisms
mesophyll the inner tissue of a leaf, whose cells are green because they contain chloroplasts Green plants as organisms
mesophyll cells the inner tissue of a leaf, whose cells are green because they contain chloroplasts Green plants as organisms
palisade mesophyll the upper layer of mesophyll where photosynthesis mostly takes place Green plants as organisms
permeable allowing water to pass through Green plants as organisms
phloem vessels vein-like structures through which food is transported round a plant Green plants as organisms
respire to engage in respiration - the energy-producing process inside living cells Green plants as organisms
root hair cells tiny hairs covering the ends of the smallest roots. They give the root a very large surface area through which to absorb water and mineral salts from the soil. Green plants as organisms
spongy mesophyll the lower layer of mesophyll which contains numerous air spaces where gas exchange takes place Green plants as organisms
starch a type of carbohydrate. Plants can turn the glucose produced in photosynthesis into starch for storage, and turn it back into glucose when it is needed for respiration. Green plants as organisms
stomata tiny holes in the epidermis (skin) of a leaf - usually on the undersides of leaves. They control water loss and gas exchange by openng and closing. Singular is stoma Green plants as organisms
sucrose a complex sugar. Sugar cane and sugar beet store sucrose instead of starch - and we use it to sweeten food Green plants as organisms
suction pressure pressure caused by loss of water through a plant's leaves, which draws or sucks replacement water up the plant from the roots Green plants as organisms
transpiration the loss of water from leaves by evaporation. It is much faster when stomata are open than when they are closed Green plants as organisms
transpiration stream the constant cycling of water from the soil, into the plant through its roots, up the plant by suction pressure and capillarity to the leaves, where it is lost by evaporation to the atmosphere, or used up in photosynthesis. Green plants as organisms
tropism growth or movement towards or away from a stimulus such as light, gravity or moisture Green plants as organisms
turgid having turgor; enlarged and swollen with water Green plants as organisms
variegated with alternating green and white patches. In variegated leaves, photosynthesis only occurs in the green patches, as the white patches contain no chloroplasts. Green plants as organisms
vascular bundle vein-like structure in the roots, stems and leaves of plants, consisting of xylem and phloem tubes Green plants as organisms
xylem vessels vein-like tissues which transport water and minerals up a plant Green plants as organisms
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