The table shows the direction and function of substances in a chemical reaction that takes place in the chloroplasts of plant cells. The table is missing a title and information at W, X, and Y.
Title:____________________
Substance Direction In the Reaction
(In or Out) Function In the Reaction
Carbon dioxide In Used to make other substances containing carbon
Oxygen Out Is a product of the chemical reaction
W In Provides the main energy source for the reaction
Sugar molecules X Y
Water In Splits and is used to provide oxygen and hydrogen atoms for the reaction
What is the direction, X, and function, Y, for the sugar molecules?
A.
Direction X is out; function Y is to provide chemical energy for the plant cell.
B.
Direction X is in; function Y is to provide heat energy for the plant cell.
C.
Direction X is out; function Y is to form more chlorophyll for the plant cell.
D.
Direction X is in; function Y is to form large sugar molecules for the plant cell.
To determine the direction and function for the sugar molecules in the chemical reaction, we need to analyze the given information from the table.
First, let's look at the direction. It is stated that water is entering the reaction, but the substance W is missing. Based on the information provided for other substances, it can be inferred that W is likely an input, just like carbon dioxide and water. Therefore, the direction for the sugar molecules (X) is most likely in.
Next, let's consider the function. From the table, different functions have been described for the other substances. Carbon dioxide is used to make other substances containing carbon, and water is split to provide oxygen and hydrogen atoms. Based on these functions, we can deduce that the function of the sugar molecules (Y) is likely related to providing energy for the plant cell.
Among the provided answer choices, only option A aligns with our deductions:
Direction X is in, indicating that the sugar molecules enter the reaction.
Function Y is to provide chemical energy for the plant cell.
Therefore, the correct answer is A.