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17.3 - Photosynthesis > Basic knowledge of Photosynthesis > Flashcards

Basic knowledge of Photosynthesis Flashcards

1
Q

What is photosynthesis ?

A

process in which energy in the form of light from the sun is used to build complex organic molecules such as glucose

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2
Q

What is light energy transferred to ?

A

chemical energy

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3
Q

What is the name given to organisms that can photosynthesise ?

A

autotrophic

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4
Q

What are heterotrophic organisms ?

A

obtain complex organic molecules by eating other organisms

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5
Q

What does carbon dioxide and water produce ?

A

glucose and oxygen

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6
Q

Where does photosynthesis take place ?

A

chloroplasts

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7
Q

What provides a large surface area in chloroplasts ?

A

network of membranes

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8
Q

Why is it important chloroplasts have large surface area ?

A

maximise absorption of light

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9
Q

What do membranes form ?

A

flattened sacs called thylakoids

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10
Q

What do thylakoids stack together to form ?

A

grana

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11
Q

What are grana joined together by ?

A

membranous channels called lamellae

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12
Q

Where are pigments found ?

A

embedded within thylakoid membrane

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13
Q

What are pigments ?

A

molecules that absorb wavelength of light and reflect others

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14
Q

What is the primary pigment in photosynthesis ?

A

chlorophyll a

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15
Q

What light does chlorophyll a reflect ?

A

green

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16
Q

Give name of other pigments that also absorb different wavelengths of light

A

chlorophyll b
xanthophylls
carotenoids

17
Q

What forms the light harvesting system ?

A

other pigments and proteins

18
Q

What is the role of pigments in light harvesting system ?

A

absorb light energy of different wavelength

transfer this energy quickly to reaction centre

19
Q

What pigment is located in the reaction centre ?

A

chlorophyll a

20
Q

What is photophosporylation ?

A

synthesis of ATP using energy from light

21
Q

Why does photosynthesis stop when plants exposed to green light ?

A

green light is reflected and not absorbed which means no energy for light dependent stage

no ATP/NADP for light independent stage

17.3 - Photosynthesis (6 decks)

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