B8 - Photosynthesis

Question 1

where does photosynthesis occur in leaves

Answer 1

chloroplasts in leaves in plants

Question 2

what is the name of green pigment in the leaves

Answer 2

chlorophyll

Question 3

what type of reaction is photosynthesis

Answer 3

endothermic

Question 4

what type of energy is used in photosynthesis

Answer 4

light energy

Question 5

give the word equation for photosynthesis

Answer 5

carbon dioxide + water –> glucose + oxygen

Question 6

define the term limiting factor

Answer 6

anything that limits the rate of a reaction when it is in short supply

Question 7

give 4 limiting factors of photosynthesis

Answer 7

• temperature
• carbon dioxide concentration
• light intensity
• amount of chlorophyll

Question 8

describe how light intensity affects rate of photosynthesis

Answer 8

increasing light intensity increases the rate of photosynthesis until another factor becomes limiting

Question 9

describe how carbon dioxide concentration affects rate of photosynthesis

Answer 9

increasing carbon dioxide concentration increases the rate of photosynthesis until another factor becomes limiting

Question 10

describe how temperature affects rate of photosynthesis

Answer 10

increasing temperature increases the rate of photosynthesis as the reaction rate increases - at high temperatures enzymes are denatured so the rate of photosynthesis quickly decreases

Question 11

why are limiting factors important in the economics of growing plants in greenhouses

Answer 11

greenhouses need to produce the maximum rate of photosynthesis whilst making profit

Question 12

how do plants use the glucose produced in photosynthesis (5)

Answer 12

• respiration
• convert it into insoluble starch for storage
• produce fat or oil for storage
• produce cellulose to strengthen cell walls
• produce amino acids for protein synthesis