Q1
What does the nucleus do?
AControls cell activities, contains DNA
BProduces energy
CControls entry/exit
DProvides support only
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 10 · Topic 1
Cell and Cell Organelles
Cells are the basic units of life, containing organelles that perform specific functions essential for the cell's survival and operation.
Core concept
The nucleus controls cell activities and contains genetic material (DNA), acting as the cell's control centre.
How it works
Mitochondria are the 'powerhouses' of the cell, producing energy (ATP) through cellular respiration for the cell's activities.
Why it matters
The cell membrane controls what enters and exits the cell, maintaining a boundary between the cell and its environment.
Key detail
Plant cells have additional structures like a cell wall (for support) and chloroplasts (for photosynthesis), not found in animal cells.
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• Nucleus: controls activities, has DNA.
• Cell's control centre.
• Mitochondria: cell's powerhouse.
• Produces energy (ATP) via respiration.
• Cell membrane: controls entry/exit.
• Maintains cell-environment boundary.
• Plant cells: cell wall, chloroplasts.
• Not found in animal cells.