Photosynthesis

Question 0

How plants use glucose

Answer 0

Respites
Stored as cellulose
                 Sucrose
                 Fatty acids, lipids
                 Starch
Amino acids--> proteins
Chlorophyll

Question 1

Photosynthesis equation

Answer 1

CO2+H2O——->C6H12O6+O2
Carbon dioxide + water ——————->glucose + oxygen
Light energy

Question 2

How do gases enter the leaf?

Answer 2

Lower epidermis, stomata. Guard cells to open/close

Question 3

How photosynthesis actually works….

Answer 3

Reaction 1: water + light —> hydrogen + chemical energy + oxygen
Reaction 2: | |
| |
Combines with carbon dioxide
=glucose

Question 4

Leaf tissue

Answer 4

Epidermal tissue
Vascular tissue ( xylem / phloem )
Mesophyll ( palisade / spongy)

Question 5

Epidermal tissue

Answer 5

Covers the plant

Question 6

Palisade mesophyll

Answer 6

Carries out photosynthesis

Question 7

Spongy mesophyll

Answer 7

Air spaces to help gas diffusion

Question 8

Xylem

Answer 8

Transpiration.
Moves water.
Dead/hollow

Question 9

Phloem

Answer 9

Translocation.
Glucose/ amino acids
Living tubes

Question 10

Transpiration

Answer 10

Passive

Driven by evaporation

Question 11

Translocation

Answer 11

Active so uses energy

Question 12

Stem tissue

Answer 12

Vascular ( xylem / phloem)

Epidermal

Question 13

Root tissue

Answer 13

Vascular ( xylem / phloem)

Epidermal

Question 14

Limiting factors

Answer 14

CO2
Temp
Water
Saturated chloroplasts

Question 15

Lead adaptations for photosynthesis

Answer 15

Green for light
Broad and flat
Thin
Stomata
Midrib/veins/vascular tissue

Question 16

Green houses and polytunnels

Answer 16

High light intensity (increased day length)
Control temp
Control CO2
Water
Soil minerals

Question 17

Soil minerals

Answer 17

Nitrates
Phosphates
Magnesium

Question 18

Nitrates

Answer 18

Allow plants to use amino acids so proteins built

Question 19

Phosphates

Answer 19

Make new DNA

Question 20

Magnesium

Answer 20

Make new chlorophyll

Question 21

How to add minerals to soil

Answer 21

Fertiliser (organic or synthetic NPK)

Hydroponics

Question 22

Hydroponics

Answer 22

Without soil, instead roots in a hydroponic solution.

Question 23

How plants absorb minerals

Answer 23

Root hair cells

Diffusion or active transport

Question 24

Venus fly trap

Answer 24

Nitrate difficient soil Not enough amino acids so proteins Capture insects for their amino acids

Question 25

Plants need water for...

Answer 25

Cells turgid for structure Photosynthesis Transport dissolved minerals

Question 26

Transpiration stream

Answer 26

Constant flow of water from roots to leaves through xylem driven by evaporation

Question 27

How guard cells work

Answer 27

Turgid too open (thick/thin cell wall) Plasmolysed to close Vacuole swelling

Question 28

Limiting factors

Answer 28

Factor which limits the rate of reaction Light CO2 Temp

Question 29

Storage of glucose in plants

Answer 29

``` Insoluble starch (storage) Respiration Fats and oils for storage Cellulose for strong cell walls Produce proteins (also need nitrate ions from soil to do this) ```

Question 30

When do plants respire

Answer 30

All day

Question 31

When do plants photosynthesise

Answer 31

During the day

Question 32

Adaptation for nitrogen deficient soil

Answer 32

Venus fly trap traps flies (contain protein)

Question 33

What do plants lose/gain through the stomata

Answer 33

CO2 O2 Water vapour

Question 34

Why are leaves flat and thin

Answer 34

Short diffusion path for gases

Question 35

Water and mineral ions are taken up by the...

Answer 35

Roots & root hair cells

Question 36

What does the plant do if water is being lost faster than it is being taken up by the roots

Answer 36

Guard cells close stomata

Question 37

How to increase evaporation

Answer 37

Hot dry windy

Question 38

Translocation

Answer 38

Through the phloem | Dissolved sugars from leaves to rest of plant