Topic 2.9: Photosynthesis Flashcards Preview

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Flashcards in Topic 2.9: Photosynthesis Deck (14):
1

Define photosynthesis

Photosynthesis is the process by which cells synthesise organic compounds (e.g. glucose) from inorganic molecules (CO2 and H2O) in the presence of sunlight

2

Define chlorophyll

Chlorophyll is a green pigment found in photosynthetic organisms that is responsible for light absorption

3

Which portion of the em spectrum does chlorophyll absorb the most?

absorbs blue, then red

4

Which portion of the em spectrum does chlorophyll absorb the least?

reflects green

5

Define light dependent reaction

The light dependent reactions convert light energy from the Sun into chemical energy (ATP)

6

Define light independent reaction

The light independent reactions use the chemical energy to synthesise organic compounds (e.g. carbohydrates)

7

What is the first step of the light dependent reaction?

Light is absorbed by chlorophyll, which results in the production of ATP (chemical energy)

8

After Light is absorbed by chlorophyll, which results in the production of ATP (chemical energy) what is the next step of the light dependent reaction?

Light is also absorbed by water, which is split (photolysis) to produce oxygen and hydrogen

9

After Light is also absorbed by water, which is split (photolysis) to produce oxygen and hydrogen what is the last step of the light dependent reaction?

The hydrogen and ATP are used in the light independent reactions, the oxygen is released from stomata as a waste product

10

What is the first step of the light independent reaction?

ATP and hydrogen (carried by NADPH) are transferred to the site of the light independent reactions

11

After ATP and hydrogen (carried by NADPH) are transferred to the site of the light independent reactions what is the next step of the light independent reaction?

The hydrogen is combined with carbon dioxide to form complex organic compounds (e.g. carbohydrates, amino acids, etc.)

12

After The hydrogen is combined with carbon dioxide to form complex organic compounds (e.g. carbohydrates, amino acids, etc.) what is the last step of the light independent reaction?

The ATP provides the required energy to power these anabolic reactions and fix the carbon molecules together

13

Where do light dependent reactions take place?

in the thylakoids

14

Where do light independent reactions take place?

stroma

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