Photosyntesis

Question 1

What is glucose used for in a plant

Answer 1

Glucose is used to:

• build cellulose for strength and storage of starch
• starch is stored and produced instead of glucose because it will not affect the transpiration stream.
• build amino acids which are used as protein
• build nitrates which are used if a plant cannot get enough minerals
• build lipids for an energy store

Question 2

How does CO2 enter the plant and O2 leave during photosynthesis

Answer 2

Diffuses through the stomata

Question 3

Where does water from photosynthesis come

Answer 3

Comes from the soil and through the stomata

Question 4

How does carbon dioxide for photosynthesis get to cells

Answer 4

Through the stomata

Question 5

How is a leaf adapted for photosynthesis

Answer 5

Large surface area for more light to fall onto

Diffusion distances for gas is short as leaf is thin

Contain chlorophyll to absorb light

Veins to bring water to the leaves

Air spaces to allow carbon dioxide to get to cells

Stomata and guard cell to keep check of gas entering and leaving the leaf

Question 6

Balanced symbol equation for photosynthesis

Answer 6

6CO2+6H2O–>C6 H12 O6+6O2

Question 7

How does the temperature affect photosynthesis

Answer 7

• If enzymes get too hot and become denatured photosynthesis cannot take place
• A high temperature increases the rate of any reaction including photosynthesis

Question 8

How does light intensity affect photosynthesis

Answer 8

• The more light the higher the rate of photosynthesis
• Eventually photosynthesis will carry on at a constant rate no matter the light intensity as the reaction can only go so fast

Question 9

How does CO2 concentration affect photosynthsis

Answer 9

• The higher the carbon dioxide concentration the higher the rate of photosynthesis
• Eventually photosynthesis will carry on at a constant rate no matter how much carbon dioxide there is