CBSE Class 9 Science The Fundamental Unit of Life MCQs Set 03

Question: Cell theory was proposed by
a) Robert Brown
b) Robert Hook
c) Schleiden and Schwann
d) Anton von Leeuwenhoek
Answer: c

Question: X is a double membraned organelle that oxidises food present in cell to release energy. X is
a) nucleus
b) endoplasmic reticulum
c) mitochondrion
d) chloroplast
Answer: c

Question: What is ‘autolysis’?
a) Self-replication
b) Self-digestion
c) Self-food producers
d) Food decomposer
Answer: b

Question: Which of the following cell organelles can make complex sugars from simple sugars?
a) Ribosomes
b) Lysosomes
c) Endoplasmic reticulum
d) Golgi apparatus
Answer: a

Question: Which of these is acellular?
a) Viruses
b) Bacteria
c) Protozoans
d) Fungi
Answer: a

Question: Chemical nature of carrier molecules facilitating transport across plasma membrane is
a) starchy
b) sugary
c) proteinaceous
d) fatty acidic
Answer: c

Question: Largest number of cell bodies of neuron in our body are found in
a) retina
b) spinal cord
c) brain
d) tongue
Answer: c

Question: Which structure in plant cell is responsible for providing the energy required to drive cellular processes?
a) Chloroplast
b) Mitochondrion
c) Nucleus
d) Golgi apparatus
Answer: b

Question: The part of a cell where nearly whole mass is concentrated is called
a) extra-nuclear part
b) nucleus
c) atom
d) neutron
Answer: b

Question: A cell loses water by osmosis when kept in a solution having a lower concentration of water than the cell. The given solution is
a) hyper-tonic
b) hypo-tonic
c) isotonic
d) dilute
Answer: a

Question: What are suicide bags?
a) Plastids
b) Mitochondria
c) Lysosomes
d) Ribosomes
Answer: c

Question: If the ribosome of a cell are destroyed then
a) respiration will not take place
b) fats will not be stored
c) carbon assimilation will not occur
d) proteins will not be formed
Answer: d

Question: Root hairs absorb water from soil by the process of
a) plasmolysis
b) diffusion
c) osmosis
d) endocytosis
Answer: c

Question: Find the best definition of ‘vacuole’.
a) A fluid filled structure surrounded by membrane.
b) A thread like structure containing nuclear material.
c) A jelly like substance which is present between nucleus and cell membrane.
d) The basic structural units of an organism.
Answer: a

Question: Cell wall of plants is mainly composed of
a) chitin
b) cellulose
c) lipids
d) lignin
Answer: c

Question: A plant cell placed in a hypo-tonic solution will not burst because of presence of
a) plasma membrane
b) cell wall
c) chloroplast
d) cytoplasm
Answer: b

Question: An organism has poorly defined nuclear membrane in its cells. This organism could be a/an
a) bacteria
b) animal
c) fungi
d) bird
Answer: a

Question: Which labelled organelles helped a student to conclude that it is a plant cell?
a) P and R only
b) P and S only
c) P, R and T only
d) P, R and U only
Answer: d

Question: Which cell organelle is not bound by a unit membrane?
a) Lysosome
b) Ribosome
c) Endoplasmic reticulum
d) Nucleus
Answer: c

Question: What is the important function of nucleus?
a) Photosynthesis
b) Cellular reproduction
c) Lipid synthesis
d) Protein synthesis
Answer: b

FILL IN THE BLANK

Question: The single largest cell in the world is of an ……….
Answer: Ostrich egg

Question: ………. are clear spaces present in the cytoplasm enclosed by a membrane.
Answer: Vacuoles

Question: Membrane-bound non-living structures in a cell is ……….
Answer: Vacuole

Question: RNA stands for ……….
Answer: Ribo Nucleic Acid

Question: ………. is concerned with transmission of hereditary traits from parents to offspring.
Answer: Nucleus

Question: ………. are amoeboid cells of blood.
Answer: White blood cells

Question: Genes are sub units of ………. The number and type of which vary from species to species.
Answer: Chromosomes

TRUE/FALSE

Question: Striking difference between a plant and animal cell is due to the presence of cell wall.
Answer: True

Question: Plastids are the sites of photosynthesis.
Answer: True

Question: Cell wall is a non-living layer.
Answer: True

Question: Golgi apparatus is present in prokaryotic cell.
Answer: False

Question: Cell wall is a semi-permeable membrane.
Answer: True

Question: Centrosomes are present in a plant cell.
Answer: False

Question: Animal cells have larger vacuoles.
Answer: False

Question: The oxidation of food in a cell takes place in mitochondria.
Answer: True

Question: Compounds like pectin and proteins also occur in cell wall.
Answer: True

Question: Endoplasmic reticulum may be smooth or rough.
Answer: True

ASSERTION AND REASON

Question: Assertion : The endoplasmic reticulum which lacks ribosomes is called smooth endoplasmic reticulum (SER).
Reason : SER is mainly involved in protein synthesis.
Options:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Answer: C

Question: Assertion : A plant cell bursts if placed in water.
Reason : High turgor pressure causes bursting of plant cells.
Options:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Answer: D

Question: Assertion : Cell wall is a non-living part of the cell.
Reason : It offers protection, definite shape and support.
Options:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Answer: A

Question: Assertion : Plasma membrane is selectively permeable.
Reason : Plasma membrane allows some molecules to pass through it more easily than others.
Options:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Answer: A

Question: Assertion : Mitochondria are called ‘powerhouses’ of the cell.
Reason : Mitochondria produce cellular energy in the form of ATP.
Options:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
Answer: A