What is the main function of the cell wall in a plant cell

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule