Try each question on your own first. Use the Show Answer button only after you have selected your option, then read the explanation and revise the related concept from your chapter notes.
1. Who discovered cells first in 1665 while observing a thin slice of cork?
A. Robert Brown
B. Robert Hooke
C. Leeuwenhoek
D. Purkinje
Answer: B. Robert Hooke
Explanation: Robert Hooke observed cork cells under a simple microscope in 1665 and termed them 'cell' (meaning little rooms).
2. Which cell organelle is known as the "Powerhouse of the Cell"?
A. Lysosome
B. Golgi Apparatus
C. Mitochondrion
D. Endoplasmic Reticulum
Answer: C. Mitochondrion
Explanation: Mitochondria generate cellular energy in the form of ATP (Adenosine Triphosphate) molecules, earning them the name powerhouse of the cell.
3. Which organelle is called the "Suicide Bag" of a cell?
A. Ribosome
B. Lysosome
C. Vacuole
D. Plastid
Answer: B. Lysosome
Explanation: Lysosomes contain powerful digestive enzymes. If the cell gets damaged, lysosomes may burst and digest their own cell.
4. What is the primary chemical component of a plant cell wall?
A. Protein
B. Lipid
C. Cellulose
D. Starch
Answer: C. Cellulose
Explanation: The plant cell wall is mainly composed of cellulose, a complex carbohydrate providing structural strength to plants.
5. Which organelle plays a crucial role in protein synthesis?
A. Mitochondria
B. Ribosome
C. Vacuole
D. Smooth Endoplasmic Reticulum
Answer: B. Ribosome
Explanation: Ribosomes are the cellular sites where amino acids are assembled into proteins.
6. Who discovered the nucleus in the cell in 1831?
A. Robert Hooke
B. Robert Brown
C. Schleiden
D. Schwann
Answer: B. Robert Brown
Explanation: Robert Brown discovered and named the nucleus inside living cells in 1831.
7. A plant cell shrinks when placed in a hypertonic solution due to loss of water. This process is called:
A. Endosmosis
B. Plasmolysis
C. Diffusion
D. Imbibition
Answer: B. Plasmolysis
Explanation: When a living plant cell loses water through osmosis in a concentrated solution, the cell contents shrink away from the cell wall (plasmolysis).
8. Kitchen of the plant cell is:
A. Mitochondria
B. Chloroplast
C. Endoplasmic Reticulum
D. Chromoplast
Answer: B. Chloroplast
Explanation: Chloroplasts contain green chlorophyll pigments that prepare food via photosynthesis, making them the kitchen of plant cells.
9. Which of the following organelles contain their own DNA and ribosomes?
A. Mitochondria and Plastids
B. Lysosomes and Vacuoles
C. Golgi apparatus and ER
D. Ribosomes and Nucleus
Answer: A. Mitochondria and Plastids
Explanation: Both mitochondria and plastids have their own independent DNA and ribosomes, enabling them to produce some of their own proteins.
10. Chromosomes are made up of:
A. DNA only
B. Protein only
C. DNA and Protein
D. RNA and Lipid
Answer: C. DNA and Protein
Explanation: Chromosomes consist of double-stranded DNA wrapped tightly around histone proteins.
This page contains a chapter-wise objective practice set. Try the questions without checking the answer first, then use the explanation to understand the point you missed. The current page contains 10 questions, so you can practise in smaller sets when you are revising.
Quick revision tip
After the practice set, write down the question numbers you missed and revise only those concepts once more. This makes MCQ practice more useful than repeatedly attempting the same questions without reviewing mistakes.
