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 ce
ll.
ll.
The correct answer is:
D.
Direction X is in; function Y is to form large sugar molecules for the plant cell.
To determine the missing direction (X) and function (Y) for the sugar molecules, we need to understand their role in the chemical reaction that takes place in the chloroplasts of plant cells.
First, we know that carbon dioxide is taken in (in) and used to make other substances containing carbon. Oxygen is produced as a product of the chemical reaction and is released out (out) of the chloroplasts.
Based on this information, we can deduce that the sugar molecules must be produced in the reaction, as they are not listed as being taken in or released out. Therefore, the missing direction (X) for the sugar molecules is in.
Now, let's consider the function (Y) of the sugar molecules. From the given information on the other substances, we can see that carbon dioxide is used to make other carbon-containing substances, while water is split to provide oxygen and hydrogen atoms for the reaction.
Since sugar molecules are essential for energy storage and are commonly produced in plant cells during photosynthesis, we can conclude that the function (Y) of the sugar molecules is to provide chemical energy for the plant cell.
Therefore, the correct answer is:
A. Direction X is in; function Y is to provide chemical energy for the plant cell.