Apurebred purple flowering plant is crossed with a purebred white flowering plant, and they produce offspring that have purple flowers. which is the trait for purple flowers?

The purple flower is a dominant trait.

It can be explained with the help of the law of dominance which states that the trait which expresses itself and masks the other in a heterozygous condition is called a dominant trait.

When two purebred parents for a particular trait (like flower color in this case) are crossed, it always results in a heterozygous offspring. The trait which is expressed in the heterozygous condition is said to be a dominant trait.

Like in this case, the offspring had purple flowers. Thus, the purple flower is a dominant trait.

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.