All 24 MCQs of 9th Class Biology Chapter 4, Cell Cycle, with answers and the reason each option is right or wrong: the 10 textbook exercise MCQs plus 14 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 10 MCQs
The multiple-choice questions at the end of Chapter 4 in your book, in the book's option order.
Q4.1Cell Cycle and Interphase
In which phase of cell cycle, maximum growth occurs in cell?
Answer(c) G1 phase
Step by step
S = DNA copying; G2 = further growth and preparation; M = division.
Why the others are wrong
(a) division.
(b) DNA replication.
(d) some growth, but G1 is the growth phase.
Remember
G1 = Growth 1.
Q4.2Cell Cycle and Interphase
In which phase of cell cycle, the chromosomes duplicate?
Answer(d) S phase
Step by step
S = synthesis of DNA.
Why the others are wrong
(a) chromatids separate here.
(b) growth.
(c) after replication.
Remember
S = Synthesis = copying.
Q4.3Mitosis
Which of the following is NOT a characteristic of mitosis?
Answer(c) The chromosome number is halved in daughter cells.
Step by step
Mitosis: 2n → two 2n cells.
Why the others are wrong
(a) true of mitosis.
(b) true of mitosis.
(d) true of mitosis.
Remember
Halving = meiosis.
Q4.4Mitosis
At which stage of mitosis do chromosomes line up in the centre?
Answer(b) Metaphase
Step by step
Meta = middle.
Why the others are wrong
(a) chromosomes condense.
(c) chromatids move to poles.
(d) nuclei reform.
Remember
Metaphase = middle.
Q4.5Mitosis
If you observe a cell in which nuclear membrane is reforming around two sets of chromosomes, what stage of cell cycle is this?
Answer(b) Telophase
Step by step
Prophase: envelope breaks; telophase: it reforms.
Why the others are wrong
(a) chromatids still moving.
(c) envelope breaks down.
(d) no envelope.
Remember
Telo = end: rebuild.
Q4.6Mitosis
How does the centrosome contribute to mitosis?
Answer(b) Makes mitotic spindle
Step by step
Spindle fibres pull chromatids apart later.
Why the others are wrong
(a) happens in S phase.
(c) Wrong.
(d) organelles duplicate in interphase.
Remember
Centrosome → spindle.
Q4.7Mitosis
Centrosomes make mitotic spindle in:
Answer(a) Animal cells
Step by step
Centrioles are absent in higher plants and prokaryotes.
Why the others are wrong
(b) no centrosome.
(c) binary fission.
(d) Wrong.
Remember
Centrosome → animal cells.
Q4.8Meiosis
An organism has 4 pairs of chromosomes. After meiosis-I, how many chromosomes and chromatids will be present in each daughter cell?
Answer(b) 4 chromosomes and 8 chromatids
Step by step
2n = 8 → n = 4 after meiosis I.
Each chromosome = 2 chromatids → 8 chromatids.
Why the others are wrong
(a) that is the parent cell after S phase.
(c) that is after meiosis II.
(d) the number is halved.
Remember
Meiosis I halves chromosomes, not chromatids per chromosome.
Q4.9Meiosis
Which event is unique to meiosis but not mitosis?
Answer(c) Crossing over
Step by step
DNA replication, alignment and nuclear division occur in both.
Why the others are wrong
(a) before both.
(b) both.
(d) both.
Remember
Crossing over = meiosis only.
Q4.10Meiosis
Why is meiosis-II necessary after meiosis-I?
Answer(c) To separate sister chromatids
Step by step
Number was already halved in meiosis I.
Recombination (crossing over) happened in prophase I.
Why the others are wrong
(a) no replication before meiosis II.
(b) done in meiosis I.
(d) in prophase I.
Remember
Meiosis II is like mitosis: chromatids part.
Set B: More MCQs from this chapter 14 MCQs
Extra questions on the same ideas, of the kind set in board papers and class tests.
QB1Cell Cycle and Interphase
Interphase lasts for about what part of the total time of the cell cycle?
Answer(d) 90%
Step by step
Division (M phase) is short.
Why the others are wrong
(a) that is roughly M phase.
(b) Wrong.
(c) Wrong.
Remember
Interphase ≈ 90%.
QB2Cell Cycle and Interphase
Neurons that stop dividing for indefinite periods remain in:
Answer(a) G0 phase
Step by step
G0 = exit from the cycle.
Why the others are wrong
(b) Wrong.
(c) Wrong.
(d) Wrong.
Remember
G-zero = zero division.
QB3Cell Cycle and Interphase
In which phase does the cell check for DNA damage after replication and repair it?
Answer(b) G2
Step by step
Check after copying → G2.
Why the others are wrong
(a) before replication.
(c) replication itself.
(d) Wrong.
Remember
G2 = second check before division.
QB4Mitosis
The events of mitosis were discovered by:
Answer(c) Walther Flemming
Step by step
Flemming → mitosis; Hertwig → meiosis.
Why the others are wrong
(a) nucleus.
(b) meiosis.
(d) cell.
Remember
F for Flemming, first division type.
QB5Mitosis
Sister chromatids separate and move to opposite poles in:
Answer(a) anaphase
Step by step
Ana = apart.
Why the others are wrong
(b) they line up.
(c) Wrong.
(d) nuclei reform.
Remember
Anaphase = apart.
QB6Cytokinesis
In plant cells, cytokinesis takes place by the formation of a:
Answer(d) phragmoplast (cell plate)
Step by step
A rigid wall cannot be pinched, so a plate grows from the centre.
Why the others are wrong
(a) animal cells.
(b) Wrong.
(c) Wrong.
Remember
Plant = plate; animal = furrow.
QB7Significance and Errors of Mitosis
Hydra reproduces asexually by:
Answer(a) budding
Step by step
Budding uses mitosis.
Why the others are wrong
(b) prokaryotes.
(c) Wrong.
(d) meiosis makes gametes.
Remember
Hydra buds.
QB8Significance and Errors of Mitosis
Tumors that migrate and invade other tissues are called:
Answer(d) malignant tumors
Step by step
Uncontrolled mitosis → tumor.
Why the others are wrong
(a) stay in place.
(b) Wrong.
(c) Wrong.
Remember
Malignant = spreading.
QB9Meiosis
Meiosis was discovered in 1876 by:
Answer(c) Oscar Hertwig
Step by step
Flemming: mitosis.
Why the others are wrong
(a) mitosis.
(b) Wrong.
(d) Wrong.
Remember
Hertwig → halving.
QB10Meiosis
The pairing of homologous chromosomes in prophase-I is called:
Answer(d) synapsis
Step by step
Tetrad = 4 chromatids.
Why the others are wrong
(a) separation.
(b) cytoplasm division.
(c) spread of cancer.
Remember
Synapsis = joining.
QB11Meiosis
The X-shaped structures formed where non-sister chromatids are joined are called:
Answer(d) chiasmata
Step by step
Singular: chiasma.
Why the others are wrong
(a) joins sister chromatids.
(b) a homologous pair.
(c) spindle attachment proteins.
Remember
Chi (χ) = X shape.
QB12Significance of Meiosis
In flowering plants, the haploid cells produced by meiosis in flowers are called:
