biology spring 1 plant tissues and organs

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Chloroplast

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Contains the green pigment chlorophyll; the site of photosynthesis.

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Epidermis

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means ‘skin’ or ‘outermost layer’. In plants the upper epidermis is transparent so that light can pass through it and the lower layer contains the stomata.

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14 Terms

1

Chloroplast

Contains the green pigment chlorophyll; the site of photosynthesis.

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2

Epidermis

means ‘skin’ or ‘outermost layer’. In plants the upper epidermis is transparent so that light can pass through it and the lower layer contains the stomata.

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3

Leaf vein

Groups of xylem and phloem tissue in a plant.

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4

Organ

A group of different tissues that work together to carry out a particular function, eg heart and lungs.

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5

Organism

Living entity, eg animals, plants or microorganisms.

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6

Palisade Mesophyll

Plant tissue containing closely packed cells which contain lots of chloroplasts in the upper layer of a leaf. Where most light is absorbed.

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7

Phloem

The tissue in plants that transports the products of photosynthesis, including sugars and amino acids.

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8

Photosynthesis

A chemical process used by plants to make glucose and oxygen from carbon dioxide and water, using light energy.

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9

Spongy mesophyll

The plant tissue in a leaf which has loosely packed cells and air spaces between them to allow gas exchange.

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10

Starch

A type of carbohydrate. Plants can turn the glucose produced in photosynthesis into starch for storage because it is insoluble.

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11

Stomata

Tiny holes in the epidermis of a leaf. They control gas exchange by opening and closing and are involved in loss of water from leaves. Singular is stoma.

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12

Transpiration

The evaporation of water from the leaves through stomata

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13

Transpiration stream

The continuous flow of water from the roots to the leaves of a plant through the xylem

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14

Xylem vessels

Narrow, hollow, dead tubes with lignin, responsible for the transport of water and minerals in plants.

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