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Biology > Photosynthesis > Flashcards

Photosynthesis Flashcards

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0
Q

How plants use glucose

A 
Respites
Stored as cellulose
                 Sucrose
                 Fatty acids, lipids
                 Starch
Amino acids--> proteins
Chlorophyll
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1
Q

Photosynthesis equation

A

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

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2
Q

How do gases enter the leaf?

A

Lower epidermis, stomata. Guard cells to open/close

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3
Q

How photosynthesis actually works….

A

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

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4
Q

Leaf tissue

A

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

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5
Q

Epidermal tissue

A

Covers the plant

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6
Q

Palisade mesophyll

A

Carries out photosynthesis

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7
Q

Spongy mesophyll

A

Air spaces to help gas diffusion

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8
Q

Xylem

A

Transpiration.
Moves water.
Dead/hollow

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9
Q

Phloem

A

Translocation.
Glucose/ amino acids
Living tubes

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10
Q

Transpiration

A

Passive

Driven by evaporation

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11
Q

Translocation

A

Active so uses energy

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12
Q

Stem tissue

A

Vascular ( xylem / phloem)

Epidermal

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13
Q

Root tissue

A

Vascular ( xylem / phloem)

Epidermal

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14
Q

Limiting factors

A

CO2
Temp
Water
Saturated chloroplasts

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15
Q

Lead adaptations for photosynthesis

A 
Green for light
Broad and flat
Thin
Stomata
Midrib/veins/vascular tissue
16
Q

Green houses and polytunnels

A 
High light intensity (increased day length)
Control temp
Control CO2
Water
Soil minerals
17
Q

Soil minerals

A

Nitrates
Phosphates
Magnesium

18
Q

Nitrates

A

Allow plants to use amino acids so proteins built

19
Q

Phosphates

A

Make new DNA

20
Q

Magnesium

A

Make new chlorophyll

21
Q

How to add minerals to soil

A

Fertiliser (organic or synthetic NPK)

Hydroponics

22
Q

Hydroponics

A

Without soil, instead roots in a hydroponic solution.

23
Q

How plants absorb minerals

A

Root hair cells

Diffusion or active transport

24
Q

Venus fly trap

A

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

25
Q

Plants need water for…

A

Cells turgid for structure
Photosynthesis
Transport dissolved minerals

26
Q

Transpiration stream

A

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

27
Q

How guard cells work

A

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

28
Q

Limiting factors

A

Factor which limits the rate of reaction
Light
CO2
Temp

29
Q

Storage of glucose in plants

A 
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)
30
Q

When do plants respire

A

All day

31
Q

When do plants photosynthesise

A

During the day

32
Q

Adaptation for nitrogen deficient soil

A

Venus fly trap traps flies (contain protein)

33
Q

What do plants lose/gain through the stomata

A

CO2
O2
Water vapour

34
Q

Why are leaves flat and thin

A

Short diffusion path for gases

35
Q

Water and mineral ions are taken up by the…

A

Roots & root hair cells

36
Q

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

A

Guard cells close stomata

37
Q

How to increase evaporation

A

Hot dry windy

38
Q

Translocation

A

Through the phloem

Dissolved sugars from leaves to rest of plant

Biology (23 decks)

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