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B4 > photosynthesis > Flashcards

photosynthesis Flashcards

1
Q

what does photosynthesis mean?

A

using light to make food

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2
Q

what is the green pigment in carrot leaves called?

A

chlorophyll

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3
Q

what is the word equation for photosynthesis?

A

carbon dioxide + water — glucose + oxygen

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4
Q

what type of sugars are glucose and sucrose?

A

soluable

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5
Q

what does soluble mean?

A

it can flow through liquid

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6
Q

what can glucose be converted into for storage?

A

starch

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7
Q

why is starch better for storage than glucose?

A

because it is insoluble

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8
Q

what are glucose and starch used for in plants?

A

energy growth and other storage products

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9
Q

what is the chemical symbol for glucose?

A

C6 H12 06

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10
Q

what else is glucose and starch converted into in a plant?

A

cellulose to make new cell walls
proteins for growth and repair
fats and oils

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11
Q

why is glucose unsuitable for storage?

A

because it easily dissolves and can be lost from the cell. It also increases the concentration of cell contents which could damage the cells

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12
Q

what are the properties of starch?

A

is insoluble
not very reactive
does not affect water concentration

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13
Q

what are isotopes?

A

different forms of the same element

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14
Q

how is oxygen made in a plant?

A

the water is split up into oxygen gas and hydrogen ions

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15
Q

what is starch made up of?

A

many glucose molecules joined together

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16
Q

give 2 reasons why plants need to grow faster in spring and summer months?

A

the higher the temperature increases the rte of reaction of enzymes involved in photosynthesis
The extra light and warmth

17
Q

why do pea plants need to be covered by glass in February?

A

to keep them warm

18
Q

what are the conditions needed in a greenhouse?

A

warmth
extra carbon dioxide
increased light

19
Q

name 3 factors that could limit photosynthesis?

A

light intensity
temperature
carbon dioxide level

20
Q

where is carbon dioxide taken in through a plant?

A

its leaves

21
Q

what does a plant do at night?

A

it takes in oxygen for respiration and releases carbon dioxide

B4 (8 decks)

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