Question

during the light - dependent reactions of photosynthesis, what would expect as end compounds to be produced?
a glucose
b atp and nadph
c water and nadph
d glucose and oxygen

during the second set of photosynthetic reactions, called the calvin cycle, all but one of the following.
a glucose is the end product of the calvin cycle
b by - products of the calvin cycle include water vapor and oxygen
c carbon dioxide, a reactant of photosynthesis, is utilized during the calvin cycle
d atp and nadph, high energy molecules, are utilized to produce stored chemical energy

Explanation:

First Question (Light - Dependent Reactions)

In the light - dependent reactions of photosynthesis, light energy is used to split water and generate energy - carrying molecules. Water is split into oxygen (a by - product that is released) and hydrogen ions. The energy from light is also used to generate ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). Glucose is produced in the light - independent (Calvin cycle) reactions, not the light - dependent ones. Water is a reactant (split) in light - dependent reactions, not a product. So the products of light - dependent reactions are ATP and NADPH.

• Option A: The end product of the Calvin cycle is glyceraldehyde - 3 - phosphate (G3P), which is used to make glucose, but glucose is not the direct end - product of the cycle in the same way. Also, this statement is not the false one we are looking for.
• Option B: The by - products of the light - dependent reactions are oxygen, and water vapor is not a by - product of the Calvin cycle. The Calvin cycle uses carbon dioxide and produces G3P (used for glucose etc.). So this statement is false.
• Option C: Carbon dioxide is taken in during photosynthesis and is utilized in the Calvin cycle to form organic molecules. This statement is true.
• Option D: ATP and NADPH, which are high - energy molecules produced in the light - dependent reactions, are used in the Calvin cycle to convert carbon dioxide into organic compounds (stored chemical energy). This statement is true.

Answer:

B. ATP and NADPH

Second Question (Calvin Cycle)