How do plant cells maintain their shape?

Cell wall & cell membrane

Explanation:

T maintain the shape of cell and vacuole also maintain the shape of cells in plants.  It is the cell wall structure that helps maintain the shape of cell. Cells which doesn't possess such definite cell walls are irregular in shape.

Vacuoles create internal pressure that prevents the cell from collapsing.

Explanation:

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.