What do you mean by :
1. hypotonic
2. isotonic
3. hypertonic solutions

1. A hypotonic solution has less solute and more water potential.

2. If two solutions are of the same concentration they have the same water potential and are considered isotonic.

3. A hypertonic solution has lower water potential and more solute.

yes it is weird but true

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.