Cell: The Building Block of Life Mind Map

Cells are studied mainly with microscopes because most cells are too small to be seen clearly with the naked eye.

When answering microscope questions, mention both magnification and clarity, and write unit conversions carefully.

A cell has a basic plan with an outer boundary, living cytoplasm, and genetic material, arranged differently in different types of cells.

For comparison questions, write the common parts first and then clearly separate plant, animal, prokaryotic, and eukaryotic features.

The cell membrane, also called plasma membrane, is a thin selectively permeable boundary that controls movement of substances into and out of the cell.

In membrane transport answers, mention the direction of movement and whether energy is needed.

The cell wall is a rigid outer covering present outside the plasma membrane in plant cells, fungi, and bacteria, but absent in animal cells.

For plasmolysis, write that water moves out by osmosis and the protoplast shrinks away from the cell wall.

Cell organelles are specialised structures inside the cytoplasm that perform particular functions in eukaryotic cells.

In organelle questions, write function with the organelle name; do not list names without roles.

Eukaryotic cells need organelles because their larger and more complex cells require division of labour and controlled internal compartments.

For reasoning questions, use the phrase division of labour and support it with two organelle examples.

Cell growth and division describe how a cell increases in size, prepares its contents, and divides to form new cells.

When asked why cells divide, mention surface-area-to-volume limitation and the need for growth or repair.

Cell division is the process by which a parent cell divides to form new cells, mainly through mitosis or meiosis.

In comparison questions, always write number of daughter cells, chromosome number, and purpose.

Cell theory states that all living organisms are made of cells, the cell is the basic unit of life, and new cells arise from pre-existing cells.

Write the three postulates in separate points when asked to state cell theory.

Cell reproduction limits refer to the fact that many cells can divide only a limited number of times, while totipotency is the ability of a cell to form all cell types of an organism under suitable conditions.

For introductory answers, define totipotency simply and contrast it with specialised cells.