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Biology A level > Osmosis > Flashcards

Osmosis Flashcards

1
Q

Definition

A

The net movement of water molecules through a partially permeable membrane from a region of high concentration to a region of low concentration.

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2
Q

Solute definition

A

Substances that dissolve in a solvent

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3
Q

Solute and water move…

A

randomly due to kinetic energy

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4
Q

equation for water potential

A

water potential = osmotic (solute) potential + turgor (hydrostatic) pressure
s + p

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5
Q

negative wp =

A

lower water potential

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6
Q

lower water potential means..

A

higher osmotic potential

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7
Q

water potential definition

A

the potential for water molecules to move freely

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8
Q

High –>

A

low

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9
Q

osmotic potential definition

A

Difference in pressure inside a cell compared to the pressure outside the cell

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10
Q

Hydrostatic presssure defintion

A

the pressure of the fluid applied to the cell membrane by solution inside the cell/ container

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11
Q

adding solute means

A

lower water potential
always -ve Wp

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12
Q

more concentrated solution means

A

more -ve WP

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13
Q

osmosis moves

A

down concentration gradient

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14
Q

pure water

A

Wp of 0kpa at standard conditions - 25oc and 100kpa
low Wp

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15
Q

adding solute

A

lowers WP

as lower conc of water per unit vol
therefore Wp = -ve value

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16
Q

more solute dissolved

A

more -ve Wp
affects pressure on membrane

17
Q

Hypotonic

A

low solute conc
high wp

18
Q

hypertonic

A

high solute conc
low wp

19
Q

Hypotonic defintion

A

osmotic conc of solution surrounding cell is lower than of the cell
water in

20
Q

isotonic

A

Osmotic conc are equal
no net movement
dynamic equilibrium

21
Q

Hypertonic definition

A

osmotic conc of solution surrounding cell is higher than of the cell
water out

22
Q

water in….

A

animal - lysed
plant - turgid
hypotonic

23
Q

Water same

A

animal - normal
plant - flaccid/ incipient plasmolysis

24
Q

water out

A

animal - shrivelled
plant - plasmolysed

25
Q
A

Biology A level (23 decks)

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