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Fundamental Unit of Life Class 9 mcq. We covered all the Fundamental Unit of Life Class 9 mcq in this post for free so that you can practice well for the exam.
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mcq on Fundamental Unit of Life for NEET Students
How is the constant chromosome number maintained in Organisms that reproduce sexually?
a) Asexual reproduction
b) Meiosis
c) Mitosis
d) Amitosis
Option b – Meiosis
Which of the following does not typically occur during mitosis in body cells?
a) Centromere division
b) Nucleolus fades away
c) Chromosomes migrate
d) Synapsis
Option d – Synapsis
During cell division, what function does the centromere serve?
a) Recombination between unrelated chromosomes
b) Formation of the division plate in cytokinesis
c) Initiating furrow formation in the membrane
d) Facilitating movement of chromosomes toward the poles
Option d – Facilitating movement of chromosomes toward the poles
Which statement about the G₀ phase is incorrect?
i. Also called the quiescent stage
ii. Refers to cells that exit the cycle
iii. These cells don’t re-enter the cycle unless needed
iv. Metabolic activity is absent in these cells
a) ii and iii
b) only i
c) only ii
d) only iv
Option d – only iv
What is absent when a cell enters mitotic phase?
a) Spindle fiber formation
b) Disassembly of nucleus and Golgi
c) DNA duplication
d) Chromosome separation toward poles
Option c – DNA duplication
Choose the accurate statements about DNA replication and centriole duplication in Animal cells.
i. DNA copying starts in the cytoplasm
ii. DNA replication starts inside the nucleus
iii. Centriole duplication happens within the nucleus
iv. Centrioles duplicate in the cytoplasm
a) ii and iv
b) i and iv
c) i and iii
d) ii and iii
Option a – ii and iv
What signals the start of the diplotene stage?
a) Breakdown of synaptonemal complex
b) Terminalisation of chiasmata
c) Nucleolus and mitochondria disappear
d) Formation of synaptonemal complex
Option a – Breakdown of synaptonemal complex
Which of the following does not take place during the first meiotic division?
a) Exchange of genetic material between homologs
b) Halving of chromosome number
c) Centromere division
d) Crossing over
Option c – Centromere division
Assertion: Meiosis promotes variation, aiding Evolution.
Reason: Gene combinations are shuffled via crossing over between homologous chromosomes.
a) Both are true and the reason explains the assertion
b) Both are true but the reason does not explain the assertion
c) Assertion is true but the reason is false
d) Both are false
Option a – Both are true and the reason explains the assertion
If gamete-forming cells undergo genetic mutations, will the change be inherited?
a) No, as gametes form through mitosis from haploid cells
b) No, as gametes form through meiosis from haploid cells
c) Yes, as gametes form through mitosis from diploid cells
d) Yes, as gametes form through meiosis from diploid cells
Option d – Yes, as gametes form through meiosis from diploid cells
Event I: Cell’s cytoplasm increases
Event II: DNA duplication
When do these occur?
a) Event I is ongoing; Event II occurs once per cycle
b) Both are continuous processes
c) Each occurs once per cycle
d) I occurs once; II continues throughout
Option a – Event I is ongoing; Event II occurs once per cycle
Which plant tissue continues to divide during the entire lifespan?
a) Collenchyma
b) Meristem
c) Parenchyma
d) Sclerenchyma
Option b – Meristem
Why does a child resemble parents yet not look identical?
a) Due to DNA replication
b) Due to chromosomal changes
c) Because of recombination between unrelated chromosomes
d) Because crossing over introduces variations during gamete formation
Option d – Because crossing over introduces variations during gamete formation
Which description is inaccurate?
a) Bivalent: pairing of homologous chromosomes
b) Synaptonemal complex: forms during chromosome pairing
c) Crossing over: gene exchange between non-homologous chromosomes
d) Chiasma: X-shaped region at crossover points
Option c – Crossing over: gene exchange between non-homologous chromosomes
What is the key Transport-related function of the plasma membrane?
a) Facilitating Molecule movement using carrier proteins
b) Synthesizing lipids and proteins
c) Packing cellular products for delivery
d) Supporting Respiration and protein synthesis
Option a – Facilitating Molecule movement using carrier proteins
What are the tiny disc-like parts found at the centromere region?
a) Centrioles
b) Chromonemata
c) Kinetochores
d) Spindle threads
Option c – Kinetochores
During which mitotic phase do chromosomes lose their distinct shape?
a) Anaphase
b) Telophase
c) Prophase
d) Metaphase
Option b – Telophase
Which component aids in chromosome movement during mitosis?
a) Mesosomes
b) Polypeptides
c) Cell membrane
d) Spindle fibers
Option d – Spindle fibers
Choose the accurate statement regarding mitotic division.
a) Nuclear division occurs before cytoplasmic division
b) Cytoplasmic division precedes nuclear division
c) Cytokinesis happens first, breaking centromeres
d) Both nuclear and cytoplasmic divisions are simultaneous
Option a – Nuclear division occurs before cytoplasmic division
Which checkpoint responds when DNA replication is incomplete?
a) Both G₂/M and M phase checkpoints
b) G₂/M checkpoint
c) M checkpoint
d) G₁/S checkpoint
Option b – G₂/M checkpoint
How does a cell re-establish the balance between its nucleus and cytoplasm?
a) Through new cytoplasm synthesis
b) By generating more protoplasm
c) By undergoing mitosis
d) Entering G₂ phase
Option c – By undergoing mitosis
During meiosis, what function does recombinase enzyme perform?
a) Recombination between unrelated chromatids
b) Crossover between non-sister chromatids of homologs
c) Compaction of chromosomes
d) Synaptonemal complex formation
Option b – Crossover between non-sister chromatids of homologs
How many times does the centromere divide during meiosis?
a) One time in anaphase I
b) One time in prophase II
c) One time in anaphase II
d) Once during both meiotic divisions
Option c – One time in anaphase II
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