11 Photosynthesis

The 2 factors needed for photosynthesis

Sunlight and Chlorophyll

What is chlorophyll?

The green pigment that captures light energy for photosynthesis

What are chloroplasts?

An organelle found in plant where photosynthesis occurs.

What is meant by a biochemical process

a chemical process that occurs in a living thing e.g. photosynthesis

Why does Temperature effects photosynthesis …

as enzymes require an optimum temperature

How does Carbon dioxide concentration effects photosynthesis…

As it supplies the carbon to make the glucose

What is glucose Glucose in the process of photosynthesis?

Carbohydrate produced by plants during photosynthesis

What is the fate of the oxygen produced?

Released into the atmosphere or used in respiration

What is the fate of the glucose produced?

Stored as starch or used during respiration for energy

What is the Chemical used to test for starch?

Iodine

What is the Chemical symbol for water?

H2O

What is the Chemical symbol for glucose?

C6H12O6

What is the Chemical symbol for Carbon dioxide

CO2

State the balanced chemical formula for photosynthesis?

6CO2 + 6H2O ------> C6H12O6 + 6O2

What is Elodea?

A water based plant that grows in freshwater ponds used to demonstrate photosynthesis

During the photosynthesis expt. how do you know photosynthesis has occurred?

Bubbles of oxygen are produced

What is photolysis?

The splitting of water in the presence of light

Name the 3 products of photolysis.

2 electrons, protons (H+) and oxygen

Select the fates of oxygen

It is used in plant respiration or released into the atmosphere

Where are hydrogens stored after photolysis?

In the proton pool

Why is pathway one consider cyclic photophosphorylation?

As the electrons return to the same reaction centre chlorophyll.

Why is the dark stage sometimes referred to as the light independent stage?

It does not require light

In which pathway of the light stage does photolysis occur?

Pathway 2

What happens to the electrons formed from the splitting of water?

They are returned to the original reaction centre chlorophyll

What are the 3 products of the light stage?

ATP, NADPH and Oxygen

State the 2 substances that NADPH brings to the dark stage

Hydrogen and electrons

What happens during the dark stage?

Carbon dioxide is converted to glucose.

What is the energy source of the dark phase?

ATP

What happens to NADPH after the dark stage?

It returns to the light stage

True or false, photosynthesis is not effected by temperature.

False

True or False, Artificial light can be used to increase glucose production (photosynthesis)

True

How is the rate of photosynthesis measured in the experiment when measuring the effect of light intensity

Count the number of bubbles of oxygen

What is the optimum temperature for plants?

20 - 30 degrees celsius

How can temperature be controlled during an experiment?

Using a water bath