All 24 MCQs of 9th Class Biology Chapter 3, The Cell, with answers and the reason each option is right or wrong: the 14 textbook exercise MCQs plus 10 more board-style MCQs. Punjab Board new syllabus.
Try each one first: tap an option to check it, then read the reasoning and why the others are wrong.
A note about the questions
The wording follows published solved exercises and every answer was re-checked by hand, so the wording or the order of options may differ slightly from your print.
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Set A: Textbook exercise 14 MCQs
The multiple-choice questions at the end of Chapter 3 in your book, in the book's option order.
Q3.1Mitochondria and Plastids
The process of cellular respiration occurs in:
Answer(b) Mitochondria
Step by step
Respiration releases energy → mitochondria.
Why the others are wrong
(a) controls the cell.
(c) protein synthesis.
(d) packaging.
Remember
Mitochondria = powerhouse.
Q3.2Organelles
The smooth endoplasmic reticulum (SER) is primarily involved in the synthesis of:
Answer(b) Lipids
Step by step
Smooth = no ribosomes = no protein making.
Why the others are wrong
(a) that is RER.
(c) Wrong.
(d) made in the nucleus.
Remember
SER → lipids; RER → proteins.
Q3.3Organelles
Ribosomes are composed of:
Answer(a) RNA and protein
Step by step
rRNA = ribosomal RNA.
Why the others are wrong
(b) that is chromatin.
(c) Wrong.
(d) Wrong.
Remember
Ribosome → RNA.
Q3.4Organelles
What is the primary function of ribosomes?
Answer(b) Protein synthesis
Step by step
Two subunits join during protein synthesis.
Why the others are wrong
(a) mitochondria.
(c) SER.
(d) nucleus.
Remember
Ribosome = protein factory.
Q3.5Organelles
Which cell organelle is involved in packaging and modifying proteins?
Answer(c) Golgi apparatus
Step by step
RER makes → Golgi modifies and packs → vesicles.
Why the others are wrong
(a) Wrong.
(b) Wrong.
(d) RER makes proteins; Golgi packages them.
Remember
Golgi = post office.
Q3.6Organelles
Which cell organelle is responsible for breaking down waste materials?
Answer(d) Lysosome
Step by step
Lysis = breaking.
Why the others are wrong
(a) packaging.
(b) Wrong.
(c) energy.
Remember
Lysosome = cell's recycling bin.
Q3.7Organelles
Which of the following cell structures is involved in maintaining cell shape?
Answer(a) Cytoskeleton
Step by step
Skeleton = support and shape.
Why the others are wrong
(b) spindle formation.
(c) control centre.
(d) digestion.
Remember
Cyto-skeleton = cell's skeleton.
Q3.8Cytoplasm and Nucleus
Which specialized region of the nucleus is responsible for ribosome assembly?
Answer(b) Nucleolus
Step by step
Nucleolus is the dense body inside the nucleus.
Why the others are wrong
(a) the jelly inside the nucleus.
(c) DNA and proteins.
(d) the double membrane around the nucleus.
Remember
Nucleolus makes ribosomes.
Q3.9Cytoplasm and Nucleus
What is the main function of the nuclear pores?
Answer(d) Control of transport of molecules
Step by step
Pore = opening for traffic.
Why the others are wrong
(a) Wrong.
(b) Wrong.
(c) ribosomes.
Remember
Pores = gates.
Q3.10Organelles
Which of the following cellular structures is found in animal cells and helps in cell division?
Answer(b) Centriole
Step by step
Absent in higher plants, fungi and prokaryotes.
Why the others are wrong
(a) in all cells; does not make spindles.
(c) plant cell wall pores.
(d) Wrong.
Remember
Centriole → spindle.
Q3.11Mitochondria and Plastids
Which sub-cellular organelle plays a crucial role in energy production within the cell?
Answer(c) Mitochondria
Step by step
Powerhouse of the cell.
Why the others are wrong
(a) Wrong.
(b) Wrong.
(d) Wrong.
Remember
Energy → mitochondria.
Q3.12Specialized Cells
In a multicellular plant, which cell type is responsible for the production of glucose?
