Oxygen production is used to measure the rate of photosynthesis.

Variables: The variables that might affect the rate of photosynthesis
in this experiment are:

Temperature: When the temperature rises so does the rate of
photosynthesis; this is because as the temperature around the plant
rises the enzymes controlling photosynthesis inside the chloroplasts
heat up and start moving around faster, the fast moving molecules
collide with other fast moving enzymes causing them to react.

elodea lab photosynthesis animation

Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis.4.

rate of photosynthesis lab results.Extracts from this document.

Light intensity, carbon dioxide levels, temperature.
Problem: To what extent does distance from a light source (5cm, 10cm, 15cm) affect the rate of photosynthesis (measured in bubbles / 3 min.) in Elodea water plants.
Elodea Lab Background: Today you will be working with the aquatic plant, elodea, also known as anacharis.

Hypothesis According to the concept of photosynthesis, elodea could.

The oxygen production will only be abundant if the light is normal, or red or blue wavelengths.
CO2 Conclusions
The Photosynthesis rate can be observed by measuring the rate of decrease in carbon dioxide concentration.

Observation: Students will see the oxygen bubbles exiting, or on the surface of the elodea leaf.

Photosynthesis Experiment in Elodea in Direct ..

A further question for research is, what is the amount of sodium bicarbonate that will not increase the speed of photosynthesis anymore, and the speed of rising punches will reach a plateau?

Rate of Photosynthesis in Elodea ernstiae ..

In this procedure, algae, immobilised in calcium alginate, provide a standardised amount of photosynthetic material, enabling semi-quantitative experiments to be undertaken. The rate of carbon dioxide uptake by the immobilised cells is used to measure the rate of photosynthesis; this can be done simply by observing the colour change of hydrogencarbonate indicator, either by eye or using a colorimeter.

Elodea Photosynthesis Lab - Ken Pitts

Light colour: Certain colours of light can change the rate of
photosynthesis in green plants such as elodea depending on how well
the light can be absorbed into the plants chlorophyll.

The Elodea plant is much simpler (less complex structurally) than the onion or cork.

Photosynthesis lab report elodea - …

I think this
because I already know that a plant needs sunlight to be able to
perform photosynthesis as shown in the formula below:


Water + Carbon dioxide>> Sunlight>> chlorophyll>> Glucose + oxygen

Also I know that if you increase anything on the left-hand side of
this formula (the part I have boxed on the diagram above), everything
on the right hand side will increase (Increase of input = increase of
output.)This means that if the concentration of light were to be
increased, the levels of glucose and oxygen (The rate of
photosynthesis) will increase.

How does this investigation demonstrate that plants give off oxygen during  photosynthesis?

affect the rate of photosynthesis in Elodea at a ..

Introductory school investigations of photosynthesis include the evolution of oxygen by Canadian pond weed (Elodea canadensis), Cabomba caroliniana* or Ceratophyllum demersum, or testing for starch in Pelargonium leaves that have been decolourised. Both methods are difficult to quantify, and the second method often misleads students.

How does the rate of photosynthesis change when sodium bicarbonate is added  to the water?

Sep 21, 2010 · Elodea Plant Cells

To do so, the plant must use carbondioxide and water in a process called.
89 LAB 7 – Photosynthesis Introduction In order to survive, organisms require a source of energy and molecular building blocks to construct all of their biological.
Photosynthesis Lab.