The Fundamental Unit of Life — Flashcards
Karnataka Board · Class 9 · Science
20 flashcards for The Fundamental Unit of Life (Karnataka Board Class 9 Science) to test yourself on key terms and facts.
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A student observes onion peel under a microscope and sees box-like structures. What are these structures called and who first discovered them?
Answer
These structures are called cells. They were first discovered by Robert Hooke in 1665 when he observed cork under a microscope. He named them 'cells' because they resembled small rooms or compartments…
Why do we add safranin or iodine solution when preparing temporary mounts of cells?
Answer
We add stains like safranin or iodine to make different parts of the cell visible under a microscope. Different regions of cells have different chemical compositions and take up stains differently, ma…
What happens when a plant cell is placed in a hypertonic solution?
Answer
The cell loses water by osmosis as water moves from the cell (lower solute concentration) to the external solution (higher solute concentration). This causes the cell contents to shrink away from the …
Why don't animal cells burst when placed in pure water, but plant cells can withstand it?
Answer
Plant cells have a rigid cell wall made of cellulose that provides structural support and prevents bursting even when the cell takes up water and swells. Animal cells lack this cell wall and would bur…
How does an Amoeba obtain its food?
Answer
Amoeba uses endocytosis to obtain food. The flexible plasma membrane engulfs food particles from the external environment, forming food vacuoles inside the cell where digestion occurs.
What is the difference between prokaryotic and eukaryotic cells?
Answer
Prokaryotic cells (like bacteria) have no nuclear membrane - their genetic material is freely distributed in the cytoplasm in a region called nucleoid. Eukaryotic cells (plants, animals) have a well-d…
Why are mitochondria called the powerhouses of the cell?
Answer
Mitochondria produce ATP (Adenosine Triphosphate), which is the energy currency of the cell. They release energy needed for all chemical activities and life processes. Their inner membrane is folded t…
A student places dried raisins in plain water and then in concentrated sugar solution. What changes occur and why?
Answer
In plain water (hypotonic solution), raisins swell as water enters by osmosis. In concentrated sugar solution (hypertonic solution), raisins shrink as water moves out. This demonstrates osmosis - move…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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