photosynthesis

Question 1

what is photosynthesis?

Answer 1

plants using carbon dioxide, water and light energy to make glucose and oxygen

Question 2

word equation for photosynthesis?

Answer 2

carbon dioxide + water -> (light energy and chlorophyll)- glucose and oxygen

Question 3

chemical equation for photosynthesis?

Answer 3

6CO2 + 6H2O -> C6H1206 + 602

Question 4

what does photosynthesis do?

Answer 4

converts light energy into stored chemical energy which can be used by the organism for respiration and for making other biological molecules

Question 5

glucose is used to make?

Answer 5

chlorophyll

Question 6

glucose is used to make lipids- what are lipids used for?

Answer 6

to make cell membranes

Question 7

glucose is used to make amino acids- what are amino acids used for?

Answer 7

joined together to make proteins e.g. enzymes

Question 8

glucose is used to make carbohydrates- what are carbohydrates used for?

Answer 8

• sucrose for transport
• starch for storage
• fructose
• cellulose- for cell walls

Question 9

to make some molecules what does the plant require?

Answer 9

mineral ions

Question 10

how are mineral ions absorbed?

Answer 10

through the roots

Question 11

what are nitrates used for?

Answer 11

• to make amino acids- (proteins)
• nucleic acids- (DNA and RNA)

Question 12

what is magnesium used for?

Answer 12

to make chlorophyll

Question 13

what are phosphates used for?

Answer 13

• to make nucleic acids (RNA and DNA)
• part of cell membrane

Question 14

what is a symptom of a deficiency of nitrates?

Answer 14

stunted growth

Question 15

what is a symptom of deficiency of magnesium?

Answer 15

yellow leaves

Question 16

what is a symptom of deficiency of phosphates?

Answer 16

• poor root growth
• purple younger leaves

Question 17

the rate of photosynthesis depends on what 3 factors?

Answer 17

1) carbon dioxide and water
2) light intensity
3) kinetic energy- temperature

Question 18

what is the limiting factor?

Answer 18

the factor which is in shortest supply

Question 19

what happens with adding more carbon dioxide?

Answer 19

• the reaction can happen faster- there are more molecules to collide with enzymes
• then we reach a point where it plateaus- adding more CO2 has no effect- there is a lack of energy

Question 20

what happens when increasing light intensity?

Answer 20

• increase the rate
• more energy for the reaction
• doesnt last forever as at high light intensities a different factor is limiting

Question 21

what happens when increasing temperature?

Answer 21

• speeds up the reaction
• enzymes and substrates have more kinetic energy- collide more often
• at high temps, the rate decreases and the reaction stops
• the enzymes have been denatured