Q1
What is the basic unit of life?
AThe cell
BThe atom
CThe molecule
DThe organ
ICSEClass 6 (ICSE)ScienceCh 16 · Topic 1
The Cell
The cell is the basic unit of life, and all living things are made up of one or more cells, each performing essential life functions.
Core concept
Cells have a cell membrane (outer boundary), cytoplasm (jelly-like substance inside), and a nucleus (control centre) in most cells.
How it works
Plant cells have additional structures, like a cell wall (rigid outer layer) and chloroplasts (for photosynthesis), which animal cells lack.
Why it matters
Cells can be seen only under a microscope, as they are too small to see with the naked eye.
Key detail
Understanding cells helps us learn about how living things grow, function, and reproduce at the most basic level.
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• The cell is the basic unit of life.
• All living things are made of cells.
• Cells have a membrane, cytoplasm and nucleus.
• Plant cells have a cell wall additionally.
• Plant cells have chloroplasts for photosynthesis.
• Animal cells lack cell walls and chloroplasts.
• Cells are seen only under a microscope.
• Cells are key to growth and life functions.