Photosynthesis

Question 0

When did land plants first appear?

Answer 0

4.5 mya

Question 1

When did the first bacteria capable of photosynthesis appear?

Answer 1

3.5 bya

Question 2

What carries our more photosynthesis - bacteria or plants?

Answer 2

Bacteria

Question 3

What is the word equation for photosynthesis?

Answer 3

Carbon Dioxide + Water & Light = Glucose + Oxygen

Question 4

What is the chemical equation for photosynthesis?

Answer 4

6CO2 + 6H20 = C6H12O6 + 602

Question 5

Where does the energy that drives photosynthesis come from?

Answer 5

The sun

Question 6

What is the green pigment in leaves and what does it do and where is it found?

Answer 6

Chrorphyll - traps sunlight energy and chloroplasts

Question 7

What do organisms use the sugar made in photosynthesis for?

Answer 7

Respiration or as the starting point for other substances needed like cellulose.

Question 8

What is some sugar stored as?

Answer 8

Starch

Question 9

What are the three factors which affect the rate at which photosynthesis occurs?

Answer 9

Temperature
Concentration of CO2
Light intenisty

Question 10

What was photosynthesis responsible for?

Answer 10

The early oxygenation of the earths atmosphere and therefore the subsequent amount of complex animals

Question 11

What experiment could tell you the link between light, photosynthesis and the presence of starch?

Answer 11

Put a leaf disc in boiling water for one minute (to burst cell membranes)
Put test tube full of alcohol in the hot water, and put leaf disc inside test tube.
The alcohol will turn green due to the chlorophyll dissolving.
Then put the colourless disc in warm water to soften it.
Add iodine solution to disc to test for starch.
Rinse with cold water to get rid of excess iodine.
Disc will be a blue-black colour.