NEET BIOLOGY

Detailed explanation-1: -Complete answer: Plants change their shape by changing the amount of water in them, resulting in swelling or shrinking of the plant cells. Plant cells can change their shape with the help of the cytoskeleton present in the cytoplasm in the stress conditions.

Detailed explanation-2: -Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane. This gives the plant cell its unique rectangular shape. Animal cells simply have a cell membrane, but no cell wall.

Detailed explanation-3: -In plant cells, changes in shape are typically accompanied by an increase in size, however, the converse is not always true and increasing size may not be accompanied by differential growth. Thus, shape does not always change with increasing size, even in complex cells such as pavement cells.

Detailed explanation-4: -Thus, the shape of the animal and plant cell is primarily maintained by the cytoskeleton. Bacteria, fungi, plants and algae have an additional non-living, rigid structure called the cell wall that surrounds the plasma membrane. It maintains the shape and provides a rigid structure to the cell.

Detailed explanation-5: -Plant cells are eukaryotic cells which contain a rigid cell wall. Due to the presence of cell walls, the eukaryotic cells have a definite geometrical shape. Irregular shape is observed in the different types of animal cells due to the absence of cell walls.