Topic 6- Plant Structure and their Functions Flashcards Preview

Biology > Topic 6- Plant Structure and their Functions > Flashcards

Flashcards in Topic 6- Plant Structure and their Functions Deck (26):
1

Waxy cuticle...

Prevents water loss through transpiration
Less stomata for decreased water loss

2

Upper epidermis...

Transparent and thin for more light to pass through to the palisade layer

3

Palisade mesophyll tissue...

Contains lots of chloroplasts to absorb the light energy which has passed through

4

Spongy mesophyll tissue...

Contains air spaces to increase rate of diffusion

5

Lower epidimis...

Contains lots of stomata (see other revision card)

6

Stomata are found...

On the lower surface of a leaf

7

Stomata allow gaseous exchange which means...

Carbon dioxide (CO2) in for photosynthesis
Oxygen (02) out as a product of this reaction

8

Water vapour escapes through the stomata during...

Transpiration

9

When the guard cells are full of water...

The guard cells are turgid (swollen) and therefore the stomata opens

10

When the guard cell are not full of water and limp...

The guard cells are flaccid and the stomata close

11

Photosynthesis word equation

Chlorophyll
Carbon dioxide + Water > Glucose + Oxygen
Light

12

Balanced photosynthesis equation

6CO2 + 6H2O > C6H12O6 + 6O2

13

Photosynthesis occurs inside the...

Chloroplasts which contains chlorophyll which absorbs light

14

Photosynthesis is an .... reaction

Endothermic reaction which means energy is TAKEN IN during the reaction

15

Phloem tubes transport...

Food substances, mainly sucrose

16

Phloem tube cells are...

Living cells
Which are seen as green through a microscope

17

Phloem tube adaptations

Have small pores in the end walls to allow sucrose and food substances to flow through quicker

18

Phloem tubes transport in...

Both directions, up and down

19

Xylem tubes transport...

Water and mineral ions from root hair cells

20

Xylem tubes are...

Dead cells
Seen as brown down a microscope

21

Xylem tube adaptations

Hollow tubes with no end cell walls therefore water flow isn’t slowed down

22

Xylem tubes transport water and mineral ions...

Upwards from the root hair cells carried to the leaves via the roots and stem

23

Root hair cells are found...

On the surface of the roots

24

Root hair cell adaptations

Large surface area for absorbing water and mineral ions
Which are transported upwards from the root hair cells

25

Root hair cells absorb minerals...

By active transport, because there is a higher concentration of mineral ions in the root hair cells compared to the soil around

26

Root hair cells absorb water...

By osmosis, water molecules moving across a partially permeable membrane, from higher water concentration to lower water concentration