bk2 ch7.2

Question 1

What is the equation for photosyinthesis

Answer 1

light energy
6CO2 + 6H2O -> C6H12O6 + 6O2
chlotophyll (C6H12O6 = glucose)

Question 2

What are the two stages of photosynthesis?

Answer 2

Stage one is called the light reaction, stage two is the dark reaction.

Question 3

What happens in the first stage of photosynthesis?

Answer 3

In this stage, light energy is trapped and changed into chemical energy. At the same time enzymes split water into oxygen and hydrogen. Enzymes are protein molecules which act as catalysts. A catalyst is something that speeds up a chemical reaction without being used up in the reaction. Enzymes helps reactions occur faster.

Question 4

What happens in the second stage of phtosynthesis?

Answer 4

Stage two is the dark reaction, a series of enzyme-controlled reactions in which carbon dioxide and
hydrogen from water combine to form glucose.
Light energy is not needed in this stage.

Question 5

The key to the process is c_____, which are

found within the cells of plants.

Answer 5

chloroplasts

Question 6

What do chloroplasts do?

Answer 6

Chloroplasts contain the green pigment chlorophyll, which acts something like a solar cell, trapping light energy and converting it to another form. Chloroplasts act as ‘factories’ for the production of glucose.

Question 7

The process by which organisms release energy from food is called r_____.

Answer 7

respiration

Question 8

What is the formula for aerobic respiration (the most common form of respiration)?

Answer 8

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy