The onion plant began as a single cell. the cell has a x number of chromosomes how many chromosomes are in each of the cell you observed how do you know

The number of chromosomes would be X during the interphase and prophase. The number of chromosomes will double i.e become 2x during anaphase and telophase.

If the cell with X number of chromosomes has undergone mitosis than the number of chromosomes in the daughter cell would be same as the cell X.

If the cell with X number of chromosomes has undergone meiosis then the number of chromosomes in the daughter cells will become half of X.

currents is the correct answer.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added