Cell Organelles — Homi Bhabha Class 9 Biology MCQs with Solutions
Free Homi Bhabha Class 9 Biology Cell Organelles MCQs with step-by-step solutions (10 questions). Part of Cell Biology & Tissues. Practise online on Prepizo — no login needed.
▶ Practise Cell Organelles online (free)
Questions with solutions
Q1 — Cell Organelles · medium · theory
The basic structural and functional unit of life is the:
A. molecule
B. tissue
C. cell ✓ Correct
D. organ
Solution: The cell is the smallest unit that can carry out all life processes.
Q2 — Cell Organelles · medium · theory
The organelle known as the "powerhouse of the cell" is the:
A. nucleus
B. vacuole
C. ribosome
D. mitochondrion ✓ Correct
Solution: Mitochondria release energy (ATP) through respiration, so they are called the powerhouse of the cell.
Q3 — Cell Organelles · hard · theory
The site of protein synthesis in a cell is the:
A. vacuole
B. chloroplast
C. lysosome
D. ribosome ✓ Correct
Solution: Ribosomes assemble amino acids into proteins.
Q4 — Cell Organelles · medium · theory
The organelle that controls all the activities of the cell is the:
A. nucleus ✓ Correct
B. mitochondrion
C. cytoplasm
D. cell membrane
Solution: The nucleus directs cell activities and contains the genetic material.
Q5 — Cell Organelles · hard · theory
The green organelle in plant cells where photosynthesis occurs is the:
A. ribosome
B. nucleus
C. chloroplast ✓ Correct
D. mitochondrion
Solution: Chloroplasts contain chlorophyll and carry out photosynthesis.
Q6 — Cell Organelles · medium · theory
The scientist who first observed and named cells (in cork) was:
A. Charles Darwin
B. Louis Pasteur
C. Robert Hooke ✓ Correct
D. Gregor Mendel
Solution: Robert Hooke observed cork cells under a microscope in 1665 and coined the term "cell".
Q7 — Cell Organelles · easy · theory
Which organelle is known as the "powerhouse of the cell"?
A. Mitochondria ✓ Correct
B. Lysosome
C. Ribosome
D. Golgi apparatus
Solution: Mitochondria carry out cellular respiration and release energy in the form of ATP, which is why they are called the powerhouse of the cell.
Q8 — Cell Organelles · medium · theory
A gland cell that secretes large amounts of a digestive enzyme (a protein) would be expected to have an especially large number of which two organelles?
A. Smooth endoplasmic reticulum and peroxisomes
B. Chloroplasts and a large vacuole
C. Lysosomes and centrioles
D. Rough endoplasmic reticulum and Golgi apparatus ✓ Correct
Solution: Proteins are made on ribosomes attached to the rough endoplasmic reticulum, then modified and packaged for export by the Golgi apparatus, so a protein-secreting cell is rich in both.
Q9 — Cell Organelles · medium · theory
Assertion: Lysosomes are called the "suicide bags" of the cell. Reason: They contain powerful digestive enzymes that can break down worn-out parts of the cell itself. Which option is correct?
A. The assertion is true but the reason is false
B. The assertion is false but the reason is true
C. Both the assertion and the reason are true, and the reason correctly explains the assertion ✓ Correct
D. Both are true, but the reason does not explain the assertion
Solution: Lysosomes hold hydrolytic (digestive) enzymes; if a lysosome bursts, these enzymes digest the cell itself. That destructive ability is exactly why they are called suicide bags, so the reason explains the assertion.
Q10 — Cell Organelles · hard · theory
In a plant cell, which organelle has its OWN DNA and ribosomes AND is the site where light energy is trapped?
A. Central vacuole
B. Nucleolus
C. Chloroplast ✓ Correct
D. Golgi apparatus
Solution: Chloroplasts contain their own circular DNA and ribosomes (evidence for their endosymbiotic origin) and they hold chlorophyll, which traps light energy for photosynthesis.