The Rate of Photosynthesis.

Question 1

What is the rate of photosynthesis affected by?

Answer 1

Intensity of light.
Volume of CO2.
Temperature .

Question 2

When a plant is short of something then it becomes what?

Answer 2

Limiting factor in photosynthesis.

Question 3

The limiting factor depends on what?

Answer 3

The conditions.

Question 4

What does the limiting factor do?

Answer 4

Stops photosynthesis from happening any faster.

Question 5

Which factor is limiting at a particular time depends on what?

Answer 5

The environmental conditions.

Question 6

At night what is the limiting factor?

Answer 6

Light.

Question 7

In winter what is the limiting factor?

Answer 7

Temperature.

Question 8

If its warm enough and bright enough, what is the limiting factor?

Answer 8

The amount of CO2.

Question 9

You can do experiments to work out the…

Answer 9

Ideal conditions for photosynthesis in a particular plant.

Question 10

What is the easiest type of plant to use?

Answer 10

Water plant.

Canadian pondweed.

Question 11

How is Canadian pondweed easy to use?

Answer 11

Easily measure the amount of oxygen produced in a given time to show how fast photosynthesis is happening.

Question 12

What is made during photosynthesis?

Answer 12

Oxygen.

Question 13

How can you measure the amount of oxygen produced?

Answer 13

Count bubbles given off.

Collect the oxygen in a gas syringe - accurate.

Question 14

How many important graphs are there for rate of photosynthesis?

Answer 14

3.

Question 15

Not enough light slows down what?

Answer 15

Rate of photosynthesis.

Question 16

Light provides what?

Answer 16

Energy needed for photosynthesis.

Question 17

If the light level is raised then what happens?

Answer 17

Rate of photosynthesis increases steadily.

Only to a certain point.

Question 18

Beyond a certain point why wont the light level make a difference?

Answer 18

It will either be temperature or CO2 which is the limiting factor.

Question 19

If you plot the rate of photosynthesis against ‘the distance of lamp from the beaker’ what do you get?

Answer 19

Weird-shape graph.

Question 20

To get a correct graph what do you need to measure?

Answer 20

Light intensity at the beaker using light meter.

Question 21

Too little carbon dioxide slows down what?

Answer 21

Rate of photosynthesis.

Question 22

The amount of CO2 only increases the rate of photosynthesis until…

Answer 22

A certain point.

Question 23

When the graph flattens it shows that Co2?

Answer 23

Not the limiting factor anymore.

Question 24

Name a way to control the amount of CO2?

Answer 24

Dissolve different amounts of sodium hydrogen-carbonate in the water, which gives of CO2.

Question 25

The temperature has to be…

Answer 25

Just right.

Question 26

If the temperature is the limiting factor its v=because…

Answer 26

Its too low.

Question 27

Enzymes needed for photosynthesis work…

Answer 27

Slowly at low temperatures.

Question 28

What happens if the plant gets too hot?

Answer 28

Enzymes needed for photosynthesis will be damaged.

Question 29

What temp do the enzymes become damaged?

Answer 29

About 45 degrees.

Question 30

What is the best way to control the temp?

Answer 30

Put flask in a water bath.