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The Fundamental Unit of Life — Class 9 CBSE Science MCQs with Solutions
Free Class 9 CBSE Science The Fundamental Unit of Life MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — easy
Who discovered cells first in cork slices using a primitive microscope in 1665?
A. Anton van Leeuwenhoek
B. Robert Hooke ✓ Correct
C. Robert Brown
D. Purkinje
Solution: Robert Hooke coined the term 'cell' in 1665.
Q2 — easy
Organelle known as 'Powerhouse of the cell' for generating ATP energy is:
A. Lysosome
B. Mitochondria ✓ Correct
C. Golgi apparatus
D. Plastid
Solution: Mitochondria generate ATP via cellular respiration.
Q3 — easy
Organelles called 'Suicide Bags' containing digestive enzymes are:
A. Ribosomes
B. Lysosomes ✓ Correct
C. Vacuoles
D. Centrosomes
Solution: Lysosomes contain hydrolytic enzymes that digest cellular debris or damaged cells.
Q4 — easy
Organelles responsible for protein synthesis inside cells are:
A. Lysosomes
B. Ribosomes ✓ Correct
C. Plastids
D. Vacuoles
Solution: Ribosomes manufacture proteins.
Q5 — easy
Cell wall of plant cells is composed mainly of complex carbohydrate called:
A. Chitin
B. Cellulose ✓ Correct
C. Starch
D. Glycogen
Solution: Plant cell walls consist of rigid cellulose fibers.
Q6 — easy
Movement of water molecules across a semi-permeable membrane from high to low concentration is:
A. Diffusion
B. Osmosis ✓ Correct
C. Active transport
D. Plasmolysis
Solution: Osmosis is selective water diffusion across semi-permeable membranes.
Q7 — easy
Shrinkage or contraction of plant cell cytoplasm away from cell wall in hypertonic solution is:
A. Hemolysis
B. Plasmolysis ✓ Correct
C. Endosmosis
D. Turgidity
Solution: Plasmolysis occurs when plant cells lose water in hypertonic media.
Q8 — easy
If a cell is placed in a Hypotonic solution (higher water concentration outside), it will:
A. Shrink
B. Swell up and may burst ✓ Correct
C. Remain same size
D. Plasmolyze
Solution: Endosmosis causes water to enter cell, swelling it.
Q9 — easy
If a cell is placed in a Hypertonic solution (lower water concentration outside), it will:
A. Swell
B. Lose water and shrink ✓ Correct
C. Burst
D. Divide
Solution: Exosmosis draws water out, shrinking the cell.
Q10 — easy
Which organelle modifies, packages, and dispatches cellular products?
A. Endoplasmic Reticulum
B. Golgi Apparatus ✓ Correct
C. Lysosome
D. Mitochondria
Solution: Golgi apparatus handles protein packaging and secretion.
Q11 — easy
Rough Endoplasmic Reticulum (RER) appears rough under microscope due to attached:
A. Lysosomes
B. Ribosomes ✓ Correct
C. Plastids
D. Centrioles
Solution: Ribosomes studded on RER give it a granular appearance.
Q12 — easy
Double-membrane organelles present ONLY in plant cells containing pigments/starches are:
A. Mitochondria
B. Plastids (Chloroplasts, Chromoplasts, Leucoplasts) ✓ Correct
C. Lysosomes
D. Centrosomes
Solution: Plastids are unique to plant cells.
Q13 — easy
Organelle containing its own DNA and Ribosomes, capable of self-replication, is:
A. Lysosome
B. Mitochondria (and Chloroplasts) ✓ Correct
C. Golgi body
D. Vacuole
Solution: Mitochondria and chloroplasts contain semi-autonomous DNA and ribosomes.
Q14 — easy
Type of cell division responsible for growth and tissue repair yielding 2 identical diploid daughter cells is:
A. Meiosis
B. Mitosis ✓ Correct
C. Amitosis
D. Binary fission
Solution: Mitosis produces two genetically identical diploid daughter cells.
Q15 — easy
Type of cell division producing 4 haploid gamete cells with half chromosome number is:
A. Mitosis
B. Meiosis ✓ Correct
C. Budding
D. Fission
Solution: Meiosis forms haploid sex cells (gametes).