Which is an example of a plant with true roots?
a) algae b) ferns c) liverworts d) moss

B) ferns

Algae, liverworts and moss are examples of plants with no real stems, leaves or roots and are also known as nonvascular plants. Plants with true roots are known as vascular plants. Vascular plants have real roots, stems and leaves and contain vascular tissues. 

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.