Photosynthesis Flashcards

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1
Q

What is photosynthesis

A

Photosynthesis is the chemical change which happens in the leaves of green plants. It is the first step towards making food- not just for plants but ultimately every animal on the planet.

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2
Q

What is the photosynthesis reaction described as and why

A

Endothermic because of the absorption of energy from the sun.

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3
Q

What is the equation for photosynthesis

A

Sunlight
Carbon dioxide + water —————> Glucose + oxygen
Chlorophyll

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4
Q

Symbol equation of photosynthesis

A

6CO(2)+6H(2)O———> C₆H₁₂O₆ +6 O ₂

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5
Q

Uses for photosynthesis

A

Respiration - glucose used to produce energy
Storage- converted to starch and oils for storage
Other useful substances- glucose can be converted into cellulose of cell walls, chlorophyll and protein for growth.

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6
Q

The starch test

A

Look over purple sheet.

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7
Q

What is destarching

A

If the result for starch is positive at the end of the experiment, it shows that the starch must have been produced during the investigation.

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8
Q

What factors affect photosynthesis

A

Light
Chlorophyll to absorb the light
Carbon dioxide
Water
A suitable temperature

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9
Q

Why is water not a limiting factor

A

If a plant is short of water the stomata will close over. This prevents entry of carbon dioxide. So it is really lack of carbon dioxide and not water.

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10
Q

What two ways are leaves adapted to photosynthesise

A

To maximise light absorption
To maximise gas exchange

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11
Q

What is the cuticle

A

The cuticle is the waxy covering which prevents water loss within the leaf

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12
Q

What does the xylem do

A

Transports water

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13
Q

What does the phloem do

A

Transports sugar (food)

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14
Q

What is the function of of the mesophyll cells

A

Palisade are packed with chloroplasts and where most photosynthesis occurs

There are two types palisade and spongy

Spongy have a large surface area for gas exchange

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15
Q

What are the stomata

A

Let’s Carbon dioxide in. Tiny holes on bottom of leaves
.

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16
Q

What are guard cells

A

The cells that surround stomata. Control the size of the holes Bach’s of water

17
Q

What is the point when photosynthesis and respiration are equal called

A

The compensation point

18
Q

What is hydrogen carbonate indicator

A

Indicates the levels of carbon dioxide
Remember my red lip

19
Q

What chemical absorbs carbon dioxide

A

Sodium hydroxide

20
Q

What chemical is a source of carbon dioxide

A

Sodium hydrogen carbonate

21
Q

How does the leaf make energy at night

A

Respiration. No light therefore the use of glucose and oxygen for energy.

22
Q

What is the compensation point

A

It occurs at dawn and dusk. It is when the rate of photosynthesis and respiration are equal. Therefore there is no gas exchange as the CO2 produced in respiration is used for photosynthesis and vice versa for oxygen.