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Chapter 11 Flashcards

Transport in Plants (17 cards)

1
Q

Osmosis

A

net diffusion of water molecules across partially permeable membrane from solution of high Ψ to one with low Ψ

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2
Q

Partially permeable membrane

A

membrane that’s permeable to some substances but not to others

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3
Q

Water potential (Ψ)

A

measure of ability of water molecules to move into a solution. Pure water has the highest Ψ.

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4
Q

Turgid

A

description of plant cell with high internal pressure so cytoplasm pushes against the cell wall

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5
Q

Flaccid

A

condition of plant cell where internal pressure is lost and cytoplasm doesn’t push against the cell wall

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6
Q

Plasmolysis

A

plant cell that has lost water by osmosis, cell contents shrinks and cell membrane and cytoplasm pull away from cell wall

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7
Q

Turgor

A

condition of plant when cells are turgid

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8
Q

Wilt

A

changes in plant when it loses too much water, leaves droop and collapse

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9
Q

Root hairs

A

specialised cells on surface of root, take up water and mineral ions from soil

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10
Q

Transpiration

A

loss of water vapour from leaves of plants

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11
Q

Transpiration stream

A

passage of water and mineral ions through roots, stem and leaves

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12
Q

Lumen

A

space in middle of tube such as artery or xylem

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13
Q

Lignin

A

woody material present in some cell walls, strengthens and makes cell impermeable to water

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14
Q

Sieve plate

A

specialised end wall of sieve tube, holes allow connection of cell to next cell

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15
Q

Sieve tube

A

cell found in phloem, consists of tube to transport photosynthesis products

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16
Q

Companion cells

A

specialised cell lying next to sieve tube controlling its activities

17
Q

Vascular bundles

A

xylem and phloem grouped together in stem or root