If i do a starch test on a plant cell that comes from a plant exposed to sunlight, which parts of the plant cell will be stained blueblack?
1. nucleus
2. cell wall
3. cytoplasm
4. vacuole
I wrote the answer as 4, the vacuole, but the correct answer says 3, the cytoplasm. Shouldn't the vacuole contain the cell sap??
sorry! There's a mistake.
the four choices are:
1. nucleus
2. cell wall
3. chloroplast
4. vacuole
So which one is the correct option?
2.cell wall
The correct answer is indeed option 3, the cytoplasm, and not option 4, the vacuole. Let me explain the reason behind it.
During the process of photosynthesis, plants convert sunlight into chemical energy in the form of glucose. This glucose is then stored in the form of starch granules within the plant cells. When conducting a starch test, you add iodine solution to the plant cells. Iodine reacts with starch and forms a blue-black color.
Now, when a plant is exposed to sunlight, the presence of light triggers photosynthesis, resulting in the production of glucose via the chloroplasts in the plant cell. The glucose is then metabolized within the cytoplasm of the cell. It is important to note that the breakdown of glucose occurs within the cytoplasm, not the vacuole.
While the vacuole does contain cell sap, which is primarily composed of water and other substances, it does not typically store starch granules. Starch granules are mainly stored in specialized plastids called amyloplasts, which are present within the cytoplasm.
Therefore, when you conduct a starch test on a plant cell that has been exposed to sunlight, the starch granules will be broken down within the cytoplasm, resulting in the blue-black staining in this part of the cell, not the vacuole.
It's essential in science to pay attention to the specific details of an experiment or process to accurately understand and answer questions related to it.