lab 7

Question 1

photosynthesis

Answer 1

• light energy is trapped in the photosynthetic pigments and used to split H2O into hydrogen and oxygen
• the hydrogen from the H2O is joined to CO2 from the atmosphere to make a simple carbohydrate
• this carbohydrate can be used directly as a fuel for respiration as a precursor for any of the complex molecules of life, or can be put into storage, as ex starch, until needed for either of the first two purposes
• (summarize: radiant energy from the sun is converted to chemical energy and used to form a carbohydrate)
• only occurs in light and requires carbon dioxide

Question 2

respiration

Answer 2

• occurring simultaneously and independently
• the process used by all living things to convert the chemical energy locked up in sugars into metabolic energy for work in the cell
• CO2 is released
• occurs in light and dark and produces carbon dioxide

Question 3

bicarbonate indicator

Answer 3

• used to measure changes in CO2 concentration
• red brown colour liquid which turns yellow when CO2 is added to it and purple when CO2 is removed
• determines weather CO2 is being produced or used by organisms
• changes colour to yellow if the ph is lowered and to purple if the ph is raised