Bioenergetics

Question 1

What are the limiting factors for photosynthesis?

Answer 1

Temperature
Carbon dioxide concentration
Light intensity
Chlorophyll concentration

Question 2

(RP) Investigating the effect of a factor on the rate of photosynthesis.

Answer 2

1) Place a piece of pondweed in a beaker and shine a light at it using a lamp a specific distance away.
2) Record the number of bubbles of gas coming out of the pondweed in 1 minute.
3) Repeat this with the lamp at different distances from the pond weed.

Question 3

What is the inverse square law?

Answer 3

When light intensity is studied, doubling the distance between the lamp and the pondweed will reduce the light intensity by a quarter.

Question 4

What other products can glucose be made into?

Answer 4

-Insoluble starch which is stored in the stem, root or leaves.
- Fat or oil which is also stored in seeds.
-cellulose to strengthen the cell walls.
-Proteins which are used for growth and for enzymes.

Question 5

What kind of reaction is respiration?

Answer 5

Exothermic.

Question 6

Why do organisms need energy?

Answer 6

-For chemical reactions to build larger molecules.
-for movement.
-to keep warm.

Question 7

What is the equation for aerobic respiration?

Answer 7

Glucose + oxygen = Carbon dioxide + Water

Question 8

What is produced in anaerobic respiration in animals and plants?

Answer 8

Animals= glucose = lactic acid.
Plants= glucose = ethanol + carbon dioxide.

Question 9

What is metabolism?

Answer 9

It is the sum of all the chemical reactions in a cell or in the body. These reactions are controlled by enzymes and may need energy transfer. This is transferred by respiration and used to make new molecules.
This includes:
-The conversion of glucose to starch, glycogen and cellulose.
-The formation of lipid molecules.
-The use of glucose and nitrate ions to form amino acids.
-The breakdown of excess proteins into urea for excretion.