Whats a cell wall? explain in detail

The cell wall

- Is rigid and thick

- Is made of cellulose

- Transports chemicals through plasmodesmata.

Plant cells are made of rigid cell walls made of cellulose. The cell wall is a layer surrounding some types of cells, just outside the cell membrane.

Hope this helped!

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.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.