Photosynthesis

Question 1

Word equation for photosynthesis

Answer 1

Carbon dioxide + water -> glucose +oxygen

6Co2 + 6H20->C6H206 +6o2

Question 2

What type of reaction is photosynthesis

Answer 2

Endothermic.

Question 3

How does temp affect photosynthesis

Answer 3

• as temp increases so does photosynthesis
• as temp approaches 45°C, rate of photosynthesis drops because the enzymes controlling photosynthesis have been destroyed

Question 4

How does co2 concentration affect photosynthesis

Answer 4

• if this increases so does rate of photosynthesis

- because co2 is needed for reaction

Question 5

How does light intensity affect photosynthesis

Answer 5

-as light intensity increases so does rate of photosynthesis

Question 6

How does chlorophyll concentration affect photosynthesis

Answer 6

If plants are grown in soil without enough minerals to make chlorophyll

Question 7

How can farmers increase their growth rate of crops

Answer 7

By controlling lighting, co2 and temp

Question 8

REQ.PRAC of effect of light intensity on pondweed

Answer 8

1) place a piece of pondweed in a beaker and shine a light using a lamp at a specific distance away
2) record no. of bubbles of gas coming out of pondweed in one min
3) repeat at different distances with lamp

Question 9

Considerations and hazard

Answer 9

Take two readings and calculate mean

-avoid water being dropped

Question 10

When light intensity is studied, ____

Answer 10

Doubling the distance between the lamp and pondweed will reduce light intensity by a quarter

Question 11

Glucose may also be changed into other products such as:

Answer 11

• insoluable starch, which is stored in stem, leaves or roots
• fat or oil, stored in seeds
• cellulose, strengthen cell walls
• proteins, used for growth and for enzymes

Question 12

Nitrate ions are needed to make

Answer 12

Proteins because amino acids contain nitrogen but glucose does not