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National 5 Biology UNIT1 > Photosynthesis > Flashcards

Photosynthesis Flashcards

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1
Q

What is photosynthesis?

A

series of enzyme controlled reactions that allows green plants to make their own food using light energy from the sun.

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2
Q

What is the equation for photosynthesis?

A

chlorophyll

Carbon dioxide+water+light energy——> glucose+oxygen

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3
Q

What are carbon dioxide and water known as in photosynthesis?

A

raw materials

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4
Q

How do green plant receive light energy?

A

chlorophyll absorbs/traps light energy from the sun

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5
Q

What is glucose considered as ?

A

a useful product

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6
Q

What is oxygen considered as?

A

a waste product

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7
Q

What can be used to test for starch?

A

Iodine solution turns blue/black

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8
Q

How many stages are there to carry out photosynthesis?

A

2

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9
Q

What is stage 1 called?

A

light reaction/photolysis(of water)

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10
Q

Where does photolysis take place?

A

In the chloroplast

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11
Q

What happens to the water at photolysis?

A

water is split to produce hydrogen and oxygen.

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12
Q

Where does the hydrogen go after photolysis?

A

second stage

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13
Q

What happens to the oxygen after photolysis?

A

released as a by-product

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14
Q

What is generated also during photolysis?

A

ATP (Light energy converted to chemical energy in the form of ATP)

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15
Q

How is oxygen released as a by-product?

A

by diffusion

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16
Q

How does hydrogen travel to stage 2?

A

via a hydrogen carrier molecule

17
Q

What is stage 2 known as?

A

Carbon fixation

18
Q

Where does carbon fixation take place?

A

in the chloroplast

19
Q

How is carbon fixation controlled?

A

enzyme controlled reaction

20
Q

What is used to help make glucose?

A

hydrogen and ATP from photolysis and carbon dioxide

21
Q

What is a limiting factor ?

A

a factor which if in short supply limits or holds up the process f photosynthesis

22
Q

What are the 3 main limiting factors?

A

light intensity
carbon dioxide concentration
temperature

23
Q

What is the need for supplementary lighting in horticulture?

A

In winter there is little light in early morning and evening

24
Q

What is the need for carbon dioxide enrichment in horticulture?

A

provides crop with optimum CO2 concentration

25
Q

What is the need for heating in horticulture?

A

provides crops with optimum temperature

National 5 Biology UNIT1 (8 decks)

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