Biology B1 - Respiration & Photosynthesis

Question 1

What’s the formula to calculate light intensity?

Answer 1

Light Intensity = 1/distance squared

Question 2

How does light intensity obey the inverse square law?

Answer 2

If you double the distance between the plant and the light source, the light intensity is quartered.

Question 3

How do you test if chlorophyll is required in photosynthesis?

Answer 3

By using a variegated leaf, you would test for starch to know if glucose has been produced. When you test the parts of the leaf for starch, it should turn blue-black which means starch is present. The white parts shouldn’t be blue black as photosynthesis hasn’t occurred there so there isn’t any starch.

Question 4

What does the graph look like for the rate of photosynthesis over the concentration of CO2.

Answer 4

The line should be near linear but then be straight. This is because at the start, there is a limiting factor of the concentration of C02. But after a certain point, that factors doesn’t affect it anymore.

Question 5

What is oxygen debt?

Answer 5

The amount of extra oxygen needed to react with lactic acid in muscles and remove it from cells. This is due to not enough oxygen breaking down the glucose during respiration.

Question 6

What is respiration?

Answer 6

Respiration is a chemical reaction in which living cells release energy from glucose (food) by producing ATP

Question 7

What is a limiting factor?

Answer 7

A limiting factor is a variable of a system that causes a noticeable change in output or another measure of a type of system.