Unit 4.1.3 Transport In Cells Flashcards Preview

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Flashcards in Unit 4.1.3 Transport In Cells Deck (43)
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1

what is being described?
the random movement of particles from an area of high concentration to an area of low concentration (down a concentration gradient) until there is no net movement (particles are evenly distributed/equilbrium reached)

diffusion

2

A concentration gradient is

the difference in concentration between one area and another - the bigger the difference the bigger the gradient

3

What factors affect rate of diffusion

temperature, concentration gradient and surface area

4

Give an example of diffusion in real life

synapses, leaves, gut, lungs, roots,

5

What part of a cell do molecules have to cross in diffusion?

cell membrane

6

In cells what diffuses?

oxygen and glucose diffuses IN and carbon dioxide diffuses OUT

7

What is an alveoli?

air sac found in the lungs - this is where diffusion of gases occurs

8

How are exchange surfaces adapted for exchange?

large surface area, moist, extensive blood supply, thin

9

If a cube has a length of 2 cm calculate its surface area, volume and surface area: volume ratio

surface area: 24
volume: 8
surface area: volume ratio 3:1

10

Osmosis is

the movement of WATER particles from an area of low solute concentration to an area of high solute concentration across a selectively permeable membrane

11

Osmosis occurs in the

roots of a plant

12

When carrying out a practical to determine the solute concentration inside a potato, why do you calculate % change in mass?

because the mass of potatoes can vary

13

When carrying out a practical to determine the solute concentration inside a potato, why do you blot the potatoes dry?

to remove any excess water as this may affect the final mass

14

Active transport is

the movement of particles from an area of low concentration to an area of high concentration (up or against a concentration gradient). Energy is required which comes from respiration.

15

Active transport in plants occurs in

the roots for the absorption of mineral ions

16

Active transport in animals occurs in

the small intestine (gut) for the absorption of glucose/sugar

17

What type of organism can rely of simple diffusion to meet its metabolic needs?

A singled cells organisms

18

Feature of single celled organisms is

it has a large surface area to volume ratio

19

Large multicellular organisms need exchange surfaces and a transport system because

they have a small surface area to volume ratio and CAN NOT obtain the materials they need by simple diffusion

20

plants require mineral ions for

healthy growth

21

Plants obtain mineral ions from the soil by

active transport

22

Structures in the small intestine are called

villi

23

These cells are adapted to absorb water and minerals from the soil

root hair cells

24

root hair cells absorb mineral ions by what process?

active transport

25

water is absorbed in the roots by what process?

osmosis

26

Active transport is also used in humans, name the location

Gut - small intestine

27

What can be said about the SA:volume ratio of a single celled organism?

it is large

28

What can be said about the SA:volume ratio of a multicellular organism

it is small

29

Exchange surfaces are adapted for exchange - how?

large SA
thin
extensive blood supply

30

exchange surfaces include

lung(alveoli), small intestine (villi), roots, leaf