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
The conservation of specific chromosome numbers in sexually reproducing organisms is achieved by
(A) Asexual reproduction
(B) Meiosis
(C) Mitosis
(D) Amitosis
Option b – Meiosis
Identify the event that is NOT a characteristic feature of mitosis in somatic cells.
(A) Splitting of centromere
(B) Disappearance of the nucleolus
(C) Chromosome movement
(D) Synapsis
Option d – Synapsis
Which of the following role centromere performs during cell division?
(A) Genetic recombination in non-homologous chromosomes.
(B) Formation of the cell plate in cytokinesis
(C) Formation of the furrow in the cell membrane
(D) Poleward movement of chromosomes
Option d – Poleward movement of chromosomes
Identify the INCORRECT statement/s about the Go stage. i. It is also known as the quiescent stage. ii. The Go phase of the cell cycle represents the cells that exit from the cell cycle. iii. Cells in this stage do not enter the cell cycle unless required. iv. Cells in this stage are metabolically inactive.
(A) ii and iii
(B) only i
(C) only ii
(D) only iv
Option d – only iv
Identify the event that does not occur once a cell enters the M phase.
(A) Formation of spindle fibers.
(B) The disappearance of the nuclear envelope, the endoplasmic reticulum, and the Golgi apparatus.
(C) DNA replication
(D) Poleward movement of chromosomes
Option c – DNA replication
Identify the CORRECT statements about DNA replication and centriole duplication (in animal cells). i. DNA replication begins in the cytoplasm. ii. DNA replication begins in the nucleus. iii. Centriole duplicates in the nucleus. iv. Centriole duplicates in the cytoplasm.
(A) ii and iv
(B) i and iv
(C) i and iii
(D) ii and iii
Option a – ii and iv
The beginning of diplotene is marked by
(A) dissolution of the synaptonemal complex
(B) terminalisation of chiasmata
(C) the disappearance of nucleolus and mitochondria
(D) formation of the synaptonemal complex
Option a – dissolution of the synaptonemal complex
Identify the event that does NOT occur in Meiosis – I.
(A) Genetic recombination between homologous chromosomes.
(B) Reduction in chromosome number in each cell.
(C) Splitting of the centromere of each chromosome.
(D) Crossing over between two homologous chromosomes.
Option c – Splitting of the centromere of each chromosome.
Assertion: Meiosis increases genetic variability and aids the process of evolution. Reason: In meiosis, crossing over occurs between two homologous chromosomes resulting new combination of genes.
(A) Both assertion and reason are true and the reason is the correct explanation of assertion.
(B) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(C) The assertion is true but the reason is false.
(D) Both assertion and reason are false.
Option a – Both assertion and reason are true and the reason is the correct explanation of assertion.
If the DNA of cells destined to form gametes undergo mutation, then would this mutation be inherited by the next generation? Why?
(A) No, as gametes are formed by the mitosis of specialized haploid cells.
(B) No, as gametes are formed by the meiosis of specialized haploid cells.
(C) Yes, as gametes are formed by the mitosis of specialized diploid cells.
(D) Yes, as gametes are formed by the meiosis of specialized diploid cells.
Option d – Yes, as gametes are formed by the meiosis of specialized diploid cells.
The event I – Cell growth in terms of increase in the cytoplasm. Event II – DNA replication. The above events (I and II) take place during cell division. Considering these events identify the correct option given below.
(A) I am a constant process and II occurs only once in the cell cycle.
(B) I and II both are a continuous process.
(C) Both I and II occur only once in a cell cycle.
(D) I occur only once in a cell cycle and II is a continuous process.
Option a – I am a constant process and II occurs only once in the cell cycle.
……… tissue in higher plants is capable of dividing throughout its life.
(A) Collenchymatous tissue
(B) Meristematic tissue
(C) Parenchymatous tissue
(D) Sclerenchymatous tissue
Option b – Meristematic tissue
A child resembles its parents but is not exactly like them. This is because of
(A) replication of DNA
(B) chromosomal aberrations. genetic variations produced by crossing
(C) between two non-homologous chromosomes.
(D) genetic variations produced by crossing over at the time of gamete formation.
Option d – genetic variations produced by crossing over at the time of gamete formation.
Which of the following structures/events is incorrectly explained?
(A) Bivalent: a complex structure formed by a pair of the synapsed homologous chromosome.
(B) Synaptonemal complex: a complex structure formed along with the synapsis of chromosomes.
(C) Crossing over the exchange of genetic material between two non-homologous chromosomes.
(D) Chiasmata: X-shaped structure formed at the site of crossovers.
Option c – Crossing over the exchange of genetic material between two non-homologous chromosomes.
Identify the CORRECT function of the plasma membrane in eukaryotic cells.
(A) Transport of molecules across it by the means of protein carriers.
(B) Synthesis of lipids and proteins.
(C) Packaging of molecules, to be delivered to intracellular targets.
(D) Sites for aerobic respiration and translation.
Option a – Transport of molecules across it by the means of protein carriers.
………. are small disc-shaped structures at the surface of centromeres.
(A) Centrioles
(B) Chromonemata
(C) Kinetochores
(D) Spindle fibers
Option c – Kinetochores
The phase of mitosis in which chromosomes lose their individuality ( Fundamental Unit of Life Class 9 MCQ )
(A) Anaphase
(B) Telophase
(C) Prophase
(D) Metaphase
Option b – Telophase
Identify the structures required for the movement of chromosomes in mitosis.
(A) Mesosomes
(B) Peptide chains
(C) Plasmalemma
(D) Spindle fibers
Option d – Spindle fibers
With respect to mitosis identify the CORRECT statement.
(A) Karyokinesis precedes cytokinesis.
(B) Cytokinesis precedes karyokinesis and causes the breakage of centromeres.
(C) Karyokinesis follows cytokinesis
(D) Both karyokinesis and cytokinesis occur simultaneously
Option a – Karyokinesis precedes cytokinesis.
Which checkpoint should be predominantly activated when a cell has stalled DNA replication fork?
(A) Both G₂M and M
(B) G₂/M
(C) M
(D) G₁/S
Option b – G₂/M
Cell restores the nucleo-cytoplasmic ratio by
(A) carrying out synthesis of cytoplasm
(B) producing more protoplasm
(C) carrying out mitotic division
(D) entering G₂ phase
Option c – carrying out mitotic division
Which of the following is the CORRECT function of enzyme ‘recombinase’ during meiosis?
(A) Crossing over between sister chromatids of non-homologous chromosomes
(B) Crossing between non-sister chromatids of homologous chromosomes.
(C) Condensation of chromosomes
(D) Formation of the synaptonemal complex
Option b – Crossing between non-sister chromatids of homologous chromosomes.
How many times splitting of the centromere takes place in meiosis?
(A) Only once during anaphase I
(B) Only once during prophase II
(C) Only once during anaphase II
(D) Twice during meiosis I and II
Option c – Only once during anaphase II
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