The Fundamental Unit of Life (Class 9 Science)
The cell is the fundamental unit of life, and all living organisms are composed of one or more cells. Understanding cell structure and function is crucial
TL;DR: The cell is the fundamental unit of life, and all living organisms are composed of one or more cells. Understanding cell structure and function is cru…
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The cell is the fundamental unit of life, and all living organisms are composed of one or more cells. Understanding cell structure and function is crucial
The Fundamental Unit of Life MCQs with Answers & Explanations
Q1. Who discovered the cell?
- Antonie van Leeuwenhoek
- Louis Pasteur
- Robert Hooke ✓ (correct)
- Schleiden
Explanation: Robert Hooke discovered the cell in 1665 while observing a thin slice of cork under a microscope.
Q2. The cell membrane is made of:
- DNA
- Carbohydrates only
- Cellulose
- Proteins and lipids ✓ (correct)
Explanation: The cell membrane is composed of a phospholipid bilayer with embedded and peripheral proteins.
Q3. Which of the following organelles is found only in plant cells?
- Chloroplast ✓ (correct)
- Nucleus
- Ribosome
- Mitochondria
Explanation: Chloroplasts are found only in plant cells and are responsible for photosynthesis.
Q4. The powerhouse of the cell is the:
- Ribosome
- Mitochondria ✓ (correct)
- Nucleus
- Chloroplast
Explanation: Mitochondria are the powerhouse of the cell, producing ATP through aerobic respiration.
Q5. The control center of the cell is:
- Chloroplast
- Mitochondria
- Nucleus ✓ (correct)
- Endoplasmic reticulum
Explanation: The nucleus is the control center containing DNA and controlling all cellular activities.
Q6. Prokaryotic cells lack:
- Cytoplasm
- Ribosomes
- Cell membrane
- Nucleus ✓ (correct)
Explanation: Prokaryotic cells do not have a membrane-bound nucleus, unlike eukaryotic cells.
Q7. The site of protein synthesis in the cell is:
- Ribosome ✓ (correct)
- Nucleus
- Mitochondria
- Golgi apparatus
Explanation: Ribosomes are the sites where proteins are synthesized according to instructions from mRNA.
Q8. The cell wall in plant cells is made of:
- Lipids
- Cellulose ✓ (correct)
- Carbohydrates
- Proteins
Explanation: The cell wall in plant cells is made of cellulose, which provides structural support.
Q9. Which organelle modifies and packages proteins?
- Lysosome
- Chloroplast
- Golgi apparatus ✓ (correct)
- Rough endoplasmic reticulum
Explanation: The Golgi apparatus modifies, packages, and ships proteins to their destinations.
Q10. Lysosomes are known as the suicide sacs of the cell because they:
- Transport materials
- Synthesize proteins
- Store energy
- Contain digestive enzymes that can destroy the cell ✓ (correct)
Explanation: Lysosomes contain powerful digestive enzymes that can break down cellular components if released.
Q11. What is the cell?
- Basic unit of life ✓ (correct)
- Part of organ
- Part of atom
- Part of tissue
Explanation: The cell is the basic structural and functional unit of all living organisms.
Q12. What are the two main types of cells?
- Plant and animal cells
- Prokaryotic and eukaryotic cells ✓ (correct)
- Large and small cells
- Active and inactive cells
Explanation: Cells are classified as prokaryotic (no membrane-bound nucleus) or eukaryotic (with membrane-bound nucleus).
Q13. What is the control center of the cell?
- Cell membrane
- Mitochondria
- Nucleus ✓ (correct)
- Ribosome
Explanation: The nucleus is the control center that contains genetic material and controls cell activities.
Q14. What is the powerhouse of the cell?
- Ribosome
- Chloroplast
- Nucleus
- Mitochondria ✓ (correct)
Explanation: Mitochondria is the powerhouse of the cell, producing ATP energy through respiration.
Q15. Which organelle is responsible for photosynthesis?
- Chloroplast ✓ (correct)
- Nucleus
- Mitochondria
- Ribosome
Explanation: Chloroplasts are present in plant cells and perform photosynthesis to produce food and oxygen.
Q16. What is the cell membrane?
- A rigid outer wall
- A flexible barrier controlling what enters and exits cell ✓ (correct)
- Inside the nucleus
- Part of cytoplasm
Explanation: The cell membrane is a semi-permeable boundary that controls the movement of substances in and out of the cell.
Q17. What is cytoplasm?
- Part of nucleus
- Outside cell boundary
- Thick fluid inside cell containing organelles ✓ (correct)
- Genetic material
Explanation: Cytoplasm is the jelly-like substance filling the cell, containing all organelles except the nucleus.
Q18. Which is true of plant cells but not animal cells?
- Mitochondria
- Nucleus
- Cell membrane
- Cell wall and chloroplasts ✓ (correct)
Explanation: Plant cells have cell walls (outside membrane) and chloroplasts, which animal cells lack.
Q19. What are ribosomes?
- Sites of protein synthesis ✓ (correct)
- Energy producers
- Genetic material
- Storage organelles
Explanation: Ribosomes are organelles where proteins are synthesized following instructions from DNA.
Frequently Asked Questions
What is the difference between prokaryotic and eukaryotic cells?
Prokaryotic cells lack a membrane-bound nucleus and organelles, while eukaryotic cells have both.
Why is the nucleus called the control center of the cell?
The nucleus contains DNA which directs all cellular activities including protein synthesis and cell division.
More Class 9 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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