L:21 The Chloroplast and the photosynthesis

 L: 21 The Chloroplast and the photosynthesis


Introduction:

This practice will observe photosynthesis of Elodea
Materials:
Algae (Elodea)
Beaker
Test Tube
Funnel
Sodium bicarbonate solution 10% (not essential) .We have not used in practice
Light source
Metric ruler

Objectives:

1-Realate the light intensity with the photosynthesis process
2- Measure the rate of photosynthesis
3- Identify the product of the process and the variables that can affect it

Procedure:

 During photosynthesis ,plants and algae produce oxygen.The research aspect of this science it to assess how light intensitiy affects the rate at which photosynthesis occurs and the rate of oxygen production

1- Take a big beaker
2-Puts the algae inside of a glass and then fill it in the beaker of water, he added test tube with water to the point of creating a vacuum container.
3- Place your preparation close to a light distance 25 cm
4- Measure the temperature
5- Leave this preparation 1 hour and a half .After this time measure the difference of gas accumulation on the top of the test tube

Questions:

 1- Identify the dependent and independent variable of this experiment
Variable is the oxygen evolution which has hi
2- Using the data from your resuls (and the group) prepare a graph and describe what happened to the amount of gas in the test tube
3- How much gas was produced in the test tube 1 hour? And and a half?
- 0,5 cm 
 4- White the photosynthesis equation .Explain each part of the equation .Which substances are produced by photosynthesis? Which gas is produced that we need in order to live?



Investigation questions:

Which is the origin of the oxygen that we breathe?

Where are the lungs of our planet?

It is the phytoplankton in the oceans. Thus these autotrophic microorganisms produce about 95% of the oxygen that is released into the atmosphere. Oxygenic photosynthesis appeared evolutionarily with cyanobacteria, also ancestors of plastids of eukaryotic algae. For nearly 2,000 million years, to the development of land plants, photosynthesis was practically restricted to the seas. The process is based on bladed Fotosintesi carbon dioxide with water to form sugar, the result is an excess of oxygen released.