Explanation

Cells have three main parts: cell membrane (controls what enters/exits), cytoplasm (jelly-like substance where reactions occur), and nucleus (contains DNA, controls cell activities).

Plant cells additionally have: cell wall (rigid support outside membrane), chloroplasts (photosynthesis), and large central vacuole (stores water, maintains turgor pressure).

Organelles like mitochondria (energy production), ribosomes (protein synthesis), and endoplasmic reticulum (transport) perform specific functions. Cells are the basic unit of life.