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CBSE Questions for Class 8 Biology Cell Structure And Functions Quiz 2 - MCQExams.com
CBSE
Class 8 Biology
Cell Structure And Functions
Quiz 2
A nervous system is comprised of ________ cells.
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Red Blood
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Muscle
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Fat
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Nerve
Explanation
The nervous system is comprised of nerve cells which help in control and coordination in the body.
The correct option is D.
Which of the following is not a cell?
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Red Blood Corpuscle (RBC)
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Bacterium
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Spermatozoa
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Virus
Explanation
The virus is an acellular microscopic infection-causing agent. It has only a protein cover and a nucleic acid (either DNA or RNA). These are intracellular parasites that depend upon the host for nutrition.
So, the correct answer is option D.
How are plant cells different from animal cells?
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Plant cells have cell wall, animal cells do not have cell wall.
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Plant cells have chloroplast, animal cells not do not have chloroplast.
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Both A and B.
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None of these.
Explanation
Plant cells have cell wall, plastids, and a large central vacuole, which are not found in animal cells. The cell wall is a rigid covering that protects the cell, provides structural support and gives shape to the cell.
The chloroplasts, found in plant cells, contain a green pigment called as chlorophyll, which captures the light energy that drives the reactions of plant photosynthesis.
Thus, the correct answer is option C.
Which cell organelle controls most of the activities of the cell?
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Endoplasmic reticulum
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Nucleus
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Mitochondria
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Golgi body
Explanation
Correct option: B
Explanation:
The
nucleus
is one of the most
important organelles
and the storehouse of the
genetic material
of the cell.
It controls many important regulatory functions such as
replication, transcription,
and all other activities of the cells.
The
endoplasmic reticulum
can be
smooth or rough
depending on the presence/absence of ribosomes.
The
RER
is involved in protein synthesis and
SER
in lipid synthesis.
Mitochondria
is essential as it produces the energy required for the cell.
The
Golgi body
has functions such as packaging and transportation of molecules.
Hence, the
cell organelle that controls most of the activities of the cell is the "
nucleus
".
Name the cell organelle which is called the 'Control room of the cell':
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Nucleus
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Mitochondria
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Chloroplast
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Ribosome
Explanation
The nucleus, in addition to its role in inheritance, acts as the regulator of the activities of the cell. Hence, it is the control room of the cell.
So, the correct answer is option A.
The word 'prokaryote' means a cell __________.
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With many nuclei
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With one nucleus
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With primitive nucleus
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Without chloroplast
Explanation
The literal meaning of 'prokaryote' is a cell having 'primitive karyon'. The term 'karyon' means 'nucleus'. A primitive nucleus is not bound by a nuclear membrane.
Hence, the correct option is C.
Find out a suitable term from the following for the various components of cells.
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Tissue
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Cell organelles
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Chromosomes
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Genes
Explanation
A cell is the basic unit of life. It is made up of the cell membrane, cytoplasm, nucleus, cell organelles and cell wall except in animal cells.
Cell organelles are the microscopic structure embedded in the cytoplasm and perform various cellular activities.
Tissue it the group of structurally and functionally similar cells.
Chromosomes are the compact structure in the nucleus made up of DNA consists of genes and protein. Thus, the correct answer is option B.
The jelly like substance present in the cell is called as
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Nucleoplasm
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Chromosome
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Chloroplast
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Cytoplasm
Explanation
The jelly-like substance inside the cell is called as cytoplasm. Cell organelles are suspended in the cytoplasm.
Hence the correct option is D.
When the cell is small, then____________________
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Nucleus will be very small.
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Nucleus will be very large.
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It will be metabolically more active.
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It will be metabolically less active.
Explanation
A small cell has less volume than a larger cell and so the enzymes, proteins are able to work faster due to surface area: volume ratio.
This causes things to move around a lot quicker in smaller cells than in larger cells and so are metabolically more active.
Thus the correct answer is option C.
Which among the following is correctly represented?
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Cell $$\rightarrow$$ Tissue $$\rightarrow$$ Organ $$\rightarrow$$ Organ system $$\rightarrow$$ Organism
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Organism $$\rightarrow$$ Organ $$\rightarrow$$ Organ system $$\rightarrow$$ Tissue $$\rightarrow$$ Cell
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Cell $$\rightarrow$$ Tissue $$\rightarrow$$ Organ system $$\rightarrow$$ Organism $$\rightarrow$$ Organ
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Organ
$$\rightarrow$$ Tissue $$\rightarrow$$ Organ system $$\rightarrow$$ Organism $$\rightarrow$$ Cell
Explanation
Cells
are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells.
A group of cells, which are structurally similar and or work together to perform a particular function are called
tissue
.
The collection of such tissues, which are joined in a structural unit to perform a certain function is called an
organ
.
An
organ system
is a group of organs that work together to perform one or more functions, e.g., the heart, blood, and blood vessels work together as a circulatory system.
Organ systems work together and carry out normal functions of life, which form an organism.
Thus, the correct answer is option A.
Which of the following feature will help you in distinguishing a plant cell from an animal cell?
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Cell wall
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Cell membrane
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Mitochondria
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Nucleus
Explanation
The cell wall is hard organelle found outside the cell membrane and is composed of cellulose. The outermost layer of animal cells is plasma membrane. The cell wall is absent in the animal cell.
So, the correct answer is option A.
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Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
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Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
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The assertion is true but the reason is false.
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Both the assertion and reason are false.
Explanation
The bacterial cell is prokaryotic. It lacks a true nucleus and
membrane-bound organelles.
On the contrary, eukaryotic cells are characterized by the presence of an organized true nucleus and membrane-bound cell organelles.
So, the correct answer is option A.
Identify the correct statement about cells.
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All the cells have nucleus.
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Cells of an organ have similar structure.
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Cells of a tissue have similar structure.
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Shape of all types of cells is round.
Explanation
The tissue is a group of cells that have a similar structure, function, and from a common origin.
Different tissues have different types of cells because an organ is made of different types of tissues and hence consists of different types of cells.
All cells do not possess a nucleus like in RBC.
Thus, the correct answer is option C.
Cells were determined to be the basic structural units of plants and animals, in which of the following time period?
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1600's
0%
1700's
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1800's
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1900's
Explanation
The cell was discovered by Robert Hook in 1665. But the statement that cell is the structural and functional unit of life generalized as cell theory in 1839 by Schleiden and Schwann. Thus, the correct answer is option C.
Which of the following is found in plant cells, but not in animal cells?
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Cell wall
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Nucleus
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Endoplasmic reticulum
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Mitochondria
Explanation
The cell wall is a unique structure present in plant cells. It is found as an outer covering to the plasma membrane.
It is absent in animal cells.
Hence the correct option is A.
Hybridoma cells are
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Nervous cells of frog
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Hybrid cells resulting from myeloma cells
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Only cells having oncogenes
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Product of spore formation in bacteria.
............................. is the key to increase the number of cells in a living being.
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Metabolism
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Growth
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Cell division
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Cell elongation
Generally, smaller the cell
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The larger the nuclei.
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The smaller the nuclei.
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It will be metabolically more active.
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It will be metabolically less active.
Explanation
The surface area of cells determines the exchange of materials. The increase in the
volume
of the cell increases its metabolic activity. However, surface area does not increase correspondingly with the volume. Therefore, larger cells are less efficient.
Metabolically active cells are usually small with the higher surface area with per unit volume.
So, the correct answer is option C.
Classify the following terms into cells, tissues and organs.
RBCs, WBCs, nerve cells, blood, muscle, blood vessels, brain, heart, hand
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Cells- RBCs, WBCs, nerve cells
Tissues- Blood, muscle
Organs- Heart, hand, brain, blood vessels
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Cells- Blood, muscle
Tissues- RBCs, WBCs, nerve cells
Organs- Heart, hand, brain, blood vessels
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Cells- RBCs, WBCs, nerve cells
Tissues- Heart, hand, brain, blood vessels
Organs- Blood, muscle
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Cells- RBCs, WBCs
Tissues- Nerve cells, blood, muscle, blood vessels
Organs- Heart, hand, brain
Explanation
A cell is the smallest form containing the genetic material, cell organelles, cytoplasm and it can replicate to give rise to new cells such as RBCs, WBCs, and nerve cells.
A group of cells that are structurally similar and or work together to perform a particular function is called a tissue such as blood and muscles.
The collection of such tissues, which are joined in a structural unit to perform a certain function is called an organ such as heart, brain, blood vessels.
Thus, the correct answer is option A.
The size of the cells of an organism has no relation with the size of its body.
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True
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False
Explanation
A cell is the smallest form containing genetic material, cell organelles, cytoplasm and it can replicate to give rise to new cells. The cell size is the same in the elephant and in ant.
How many cells are present in human body?
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One million cells.
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One billion cells.
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One trillion cells.
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More than a trillion cells.
Explanation
Humans are complex organisms made up of more than trillions of cells, each with their own structure and function. Thus, Option D is correct.
The outermost boundary wall of an animal cell is called ____________.
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Plasma membrane
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Nucleus
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Cytoplasm
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Cell wall
Explanation
The plasma membrane is the common boundary between the cell and its environment in all cells.
But it is the outermost covering of the animal cells. It is the elastic and semipermeable membrane and regulates
what enters and exits the cell.
The cell wall forms the outermost boundary of plant cells.
Hence the correct option is A.
The organisms lacking nuclear membrane and cell organelles is called as
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Prokaryotes
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Eukaryotes
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Both A and B
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Neither A nor B
Explanation
Prokaryotes are unicellular primitive organisms that possess nucleus without the nuclear membrane. They do not possess membrane-bound cell organelles.
Thus, the correct answer is option A.
The living substance of cell was named by Dujardin as____________________
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Biotic soup
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Jivam
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Sarcode
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Protoplasm
Explanation
Dujardin applied the name 'sarcode' to the free plasma without a covering to protect it from the contact with the outer world. So, the living things were named as a sarcode.
Thus, the correct answer is option C.
The ratio of inorganic matter to organic matter in a cell is ______.
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Variable
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1 : 9
0%
9 : 1
0%
10 : 5
Explanation
Usually there are more organic components than inorganic components in a cell in terms of concentration and weight.
So, the correct answer is option B.
The chromosomes lie inside
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Nucleus
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Nucleolus
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Cytoplasm
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Golgi apparatus
Explanation
Chromosomes are structures seen inside the nucleus of the cell. They contain the genes which are the units of inheritence. These structures are visible only during cell division.
Hence the correct option is A.
Fill in the blank:
A tissue is a group of _________ cells performing a specific function.
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similar
0%
different
0%
only elongated
0%
None of the above
Explanation
A tissue is a group of the similar or same type of cells that together perform a specific function.
The correct option is A.
Out of the following, select the correct match for the label given in the figure.
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A-Chloroplast, B-Cell wall, C-Vacuole, D-Nuclear pore, E-Rough endoplasmic reticulum, F-Plasma membrane, G-Centriole, H-Mitochondria
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A-Mitochondria, B-Cell wall, C-Vacuole, D-Nuclear pore, E-Rough endoplasmic reticulum, F-Plasma membrane, G-Centriole, H-Chloroplast
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A-Chloroplast, B-Plasma membrane, C-Vacuole, D-Nuclear pore, E-Rough endoplasmic reticulum, F-Cell wall, G-Centriole, H-Mitochondria
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A-Chloroplast, B-Cell wall, C-Vacuole, D-Nuclear pore, E-Golgi apparatus, F-Plasma membrane, G-Centrioles, H-Mitochondria
Explanation
A is the chloroplast. They are green coloured plastids, which comprises green coloured pigments within the plant cell and are called chlorophyll.
B is the cell wall. It is the tough, flexible, sometimes rigid outer covering of the cell outside the cell membrane. It gives support, protection and acts as filtering mechanism.
C is the vacuole. It have a simple structure and are surrounded by a thin membrane and filled with fluid and molecules they take in.
D is nuclear pore. Nuclear pore is a protein-lines channel in the nuclear envelope that regulates the transportation of molecules between the nucleus and the cytoplasm.
E is rough endoplasmic reticulum. It is an organelle found in eukaryotic cells. Its main function is to produce proteins. It is made of cisternae which are together held by a cytoskeleton.
F is plasma membrane. Plasma membrane is made up of proteins and lipids and it protects the cell from its surroundings.
G is the centriole. They are paired barrel shaped organelles located in the cytoplasm of animal cell near nuclear envelope and they plays a role in organizing microtubules that serve as the cell's skeletal system.
H is mitochondria. It is a double membrane bound organelle found mostly in eukaryotes. Their function is to generate ATP and thus to produce energy.
So, the correct option is (A).
Which of the following can be used to stain cells?
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Methylene blue solution
0%
Iodine solution
0%
Safranin solution
0%
All of the above
Explanation
Cells
are
stained
to enhance visualization of the
cell
or certain
cellular
components under a microscope. Some of the examples of staining solutions are methylene blue solution, iodine solution, safranin solution, etc.
So, the correct answer is option D.
Which part of the cell controls the various functions of the cell?
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Nucleus
0%
Mitochondrion
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Cell wall
0%
Golgi apparatus
Explanation
The nucleus is the most important part of the cell which regulates all the cellular activities. It is also called the control center of the cell.
Hence, the correct option is A.
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