Q1
What does the cell membrane do?
AControls what enters and exits the cell
BProduces energy
CContains genetic material
DNothing specific
ICSEClass 9 (ICSE)BiologyCh 2 · Topic 1
The Cell - Structure and Functions
The cell, the basic unit of life, has specific structures like the nucleus, mitochondria, and cell membrane, each performing essential funct
Core concept
The cell membrane controls what enters and exits the cell, while the nucleus contains genetic material and controls cell activities.
How it works
Mitochondria are the 'powerhouse of the cell', producing energy through cellular respiration for the cell's activities.
Why it matters
Plant cells have additional structures like a cell wall (for support) and chloroplasts (for photosynthesis), which animal cells lack.
Key detail
Understanding cell structure and function helps us appreciate how living things grow, function, and maintain life at the most basic level.
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• The cell membrane controls entry and exit.
• The nucleus contains genetic material.
• It controls cell activities.
• Mitochondria are the 'powerhouse of the cell'.
• They produce energy through respiration.
• Plant cells have cell walls and chloroplasts.
• Animal cells lack these structures.
• Cell structure explains growth and life functions.