Unit 4.2 Plant tissues, organs and organ systems Flashcards Preview

11B1 - AQA Biology Trilogy > Unit 4.2 Plant tissues, organs and organ systems > Flashcards

Flashcards in Unit 4.2 Plant tissues, organs and organ systems Deck (41)
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1

Epidermal tissue function is

covers the plant

2

Palisade mesophyll tissue function is

trap sunlight for photosynthesis - packed full with chloroplasts

3

Spongy mesophyll tissue function is

contains lots of air spaces to allow gases to diffuse in and out of cells

4

Xylem function

to transport water from the roots up and down the plant

5

Phloem function

to transport glucose from the leaves up and down the plant

6

Translocation...

Is the mass movement of sugars up and down the plant

7

Meristem tissue function

found at the growing tips (shoots and roots) and can differentiate into lots of different types of plant cells

8

Upper epidermis tissue function is

transparent so that light can pass through

9

Stomata function is

composed of 2 guard cells - this allows the gases to diffuse into and out of the leaf

10

The phloem tubes are made up of

elongated living cells

11

Xylem tubes/vessels are made up of

dead cells

12

Define the transpiration stream

movement of water from the roots, through the xylem and out of the stomata

13

Transpiration is

the evaporation of water from the leaves of a plant via its stomata

14

Transpiration is fastest when it is

windy, dry air, sunny and warm

15

Transpiration is slow when it is

cold, dark, humid and not windy

16

How can you estimate the rate of transpiration?

By measuring the rate of water uptake using a potometer

17

Name the cell that makes up the stomata

guard cells

18

How do guard cells respond when there is plenty of water available?

they become turgid and the stomata open

19

How do guard cells respond when there is not a lot of water available?

they shrink and become flaccid and the stomata close

20

How do they stomata respond to the dark

they close to conserve water

21

Which side of a leaf do you find more stomata

underside

22

Why is there fewer stomata on the upper surface of a leaf?

because it is sunnier and warmer - having less stomata reduced water loss

23

why is the upper epidermis transparent?

to allow light to pass through

24

What type of cells is the xylem made from ?

dead cells

25

Xylem tubes are strengthened by what material?

lignin

26

The movement of water from the roots up the stem and out through the leaves is called the...

transpiration stream

27

This word describes the evaporation and diffusion of water from the leaf via the stomata

transpiration

28

Phloem tubes are made up from what type of cell?

living cells

29

In a plant is glucose transported down the plant OR up and down the plant?

up AND down

30

The movement of glucose up and down the plant is called?

translocation