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CBSE Questions for Class 8 Biology Cell Structure And Functions Quiz 3 - MCQExams.com
CBSE
Class 8 Biology
Cell Structure And Functions
Quiz 3
Match the following and pick the correct options given.
Cell organelle
Function
a. Endoplasmic reticulum
Take part in cellular respiration
b. Free ribosomes
Take part in osmoregulation and excretion
c. Mitrochondrion
Synthesize lipids
d. Contractile vacuole
Synthesize non secretory proteins
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a- 3, b- 4, c- 1, d- 2
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a- 1, b- 2, c- 4, d- 3
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a- 3, b- 4, c- 2, d- 1
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a- 3, b- 2, c- 1, d- 4
The membrane bound organelles occur in
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Blue green algae
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Bacteria
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Eukaryotic cell
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All of the above
Explanation
Eukaryotic cells are the cells that contain well developed, membrane-bounded nucleus and organelles such as mitochondria and the Golgi apparatus. Blue-green algae and bacteria lack membrane-bound organelles. Thus, the correct answer is option C.
Cell is called as the structural and functional units of life because_________.
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All organisms are formed of cells.
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All cells are biochemical reaction house.
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ATP is synthesized within cells.
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All of the above.
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.
Cells provide specific conditions, for the occurrence of metabolic reactions.
These have specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body such as respiration (formation of ATP in the cell)
So, the correct answer is option D.
A cell can be declared dead, when it_______.
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Loses its capacity to divide but otherwise physiologically active due to intact nucleus
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Has lost its cytoplasm
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Is metabolically dead
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Both B and C
Explanation
The various living components of a cell are cytoplasm and cell organelles like chloroplast, nucleus, endoplasmic reticulum, mitochondria etc. While metabolic by-products are considered to be non-living components.
Thus, by losing its cytoplasm, a cell is dead, as all its organelles will also be lost. Losing all organelles will result in no metabolic activity, causing the cell to automatically die.
Hence, the correct answer is option D.
The structural unit of a living being is
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Atom
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Molecule
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Compound substance
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Cell
The cells with no membrane-bound organelles and nuclear membrane are
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Plant cells
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Animal cells
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Prokaryotic cells
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Eukaryotic cells
Explanation
Prokaryotic cells are primitive cells. They do not possess many membrane bound organelles as mitochondria, lysosomes etc. They also do not haven well-defined membrane-bound nucleus. Hence the correct option is C.
.......... is the basic unit of life.
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Cell
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Tissue
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System
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Organism
Explanation
Cells are called as the basic 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. Cells provide the specific conditions, for the occurrence of the metabolic reactions. These have the specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body.
A cell is a building unit of an organism. Select the correct statements.
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In unicellular organisms, a single cell is capable of performing all the functions of life
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In multicellular organisms, a single cell is capable of performing all the functions of life
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Both A and B
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None of these
Explanation
Cells are called the structural and functional unit of life because all the living organisms are made up of cells and perform all life process for survival. Unicellular organisms are made up of a single cell and single-cell only performs all the functions of life. Whereas multicellular organisms are made up of multiple cells and perform all the functions of life. Thus, the correct answer is option A.
Onion cells and cheek cells are the examples of prokaryotic cell.
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True
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False
Explanation
Onion cell and cheek cell both are eukaryotic cells as they have a distinct nucleus. An onion cell is a plant cell that has an outermost rigid cell wall and a large vacuole. They appear
brick-like in shape. On the other hand, a human
cheek cell is an animal cell having a rounded structure but lacking a cell wall.
So, the correct answer is 'False'.
The component of the cell with hereditary material is:
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Nucleus
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Endoplasmic reticulum
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Cytoplasm
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Vacuole
Explanation
The nucleus is the membrane-bound structure of the cell. It contains the majority of the cell's genetic material, i.e., DNA in the chromosomes.
So, the correct answer is option A.
Tissue is formed by the combination of _____.
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Organs
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Organ systems
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Cells
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All of the above
Explanation
A group of cells that are similar in structure and work together to achieve a particular function forms a tissue.
There are four basic tissue types present in animals defined by their morphology and function: epithelial tissue, connective tissue, muscle tissue, and nervous tissue.
So the correct answer is option C.
Plant cells differ from animal cells in having __________.
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Cell wall
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Plastids
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A large central vacuole
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All of these
Explanation
A plant cell has a rigid cell wall on the outside. It has plastids and a centrally located large vacuole. Animal cells do not have cell walls and plastids. The vacuoles are smaller and not centrally placed.
Hence, the correct option is D.
Cells are able to live and perform its functions due to the presence of_________________
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Organelles
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Lysosomes
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Cell wall
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Ribosomes
Explanation
The cell is the basic unit of life. All the living organisms are made up of cells and each cell performs a life-sustaining process. The cell is composed of the cell membrane, cytoplasm, nucleus, cell organelles and cell wall (except animal cells). An organelle is a distinct part of a cell, which has a particular structure and function.
Each organelle performs a particular function. For example- mitochondria produce ATPs, lysosomes digest cellular waste and debris, centrioles separates chromosomes during cell division, Ribosome synthesizes proteins, cell wall protects, etc.
Due to this, a cell can survive and
perform its own functions. Thus, the correct answer is option A.
Where are the chromosomes found in cell?
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Nucleus
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Cytoplasm
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Lysosome
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Ribosome
Explanation
A chromosome is a structure found inside the nucleus of the cell. It contains the genetic material. It is visible only during cell division.
Hence the correct option is A.
The basic living structure of an organism is an organ.
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True
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False
Explanation
The basic living structure of all organisms is a cell. Cell, which was discovered by Robert Hooke in the year 1665, is considered to be the basic structural and functional unit of all the organisms.
Many cells combine together to form a tissue. Many tissues together form an organ. Many organs form an organ system and many different organ systems together form a human body.
So, option cell is the structural and functional unit of all organisms and so option B.
What is the appropriate difference between plant cells and animal cells?
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Plant cell- cell wall is present, Animal cell- cell wall is absent
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Plant cell- cell wall is absent, Animal cell- cell wall is present
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Plant cell- cell wall is present, Animal cell- cell wall is present
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Plant cell- cell wall is absent, Animal cell- cell wall is absent
Explanation
Plant cell possesses a cell wall while animal cells lack. Plant cells possess chloroplasts while animal cells lack. Plant cells possess single, large vacuole while animal cells possess many, small vacuoles. Thus, the correct answer is option A.
Bacterial cells differ from eukaryotic cells in not having:
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DNA
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Cytoplasm
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Cell membrane
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A well-defined nucleus
Explanation
A eukaryotic cell has a well-developed nucleus which means the nucleus is bound by a membrane.
In the bacterial cell, the genetic material lies in the cytoplasm; there is an absence of a nucleus with a nuclear membrane. Therefore, a bacterial cell does not possess a well-defined nucleus.
Hence, the correct option is D.
Several tissues combine to form_________________
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Organ
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Organism
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Cell
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Cytoplasm
Explanation
A group of cells, which are structurally similar and 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. Whereas cytoplasm is the living fluid in the cell. Thus, the correct answer is option A.
A cell is considered to be a fundamental unit of life because___________________
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It has various organelles.
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An organism is made up of cells.
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It is the smallest structure that exhibits growth, metabolism, self regulation and self duplication.
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No smaller unit has yet been tested by scientists so far.
Correct statement regarding Vacuoles is?
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It is non-living inclusion found in the cytoplasm
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It is filled with water and other organic substances
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It is large in plant cell
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All of the above
Explanation
Vacuoles are non-living inclusion in the cytoplasm bound by a membrane.
These are filled with water and other organic substances in solution form called cell sap.
In plants, it is large in size and animals, it is smaller in size.
Thus, Option D is correct.
The main difference between the prokaryotic cell and the eukaryotic cell is that in the prokaryotic cell there is no:
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Cell membrane
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Cell wall
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Genes
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Distinct nucleus
Explanation
In the prokaryotic cell, there is no definite nucleus with a nuclear membrane.
Eukaryotes have a well-defined nucleus with a nuclear membrane.
Hence, the correct option is D.
Cells are limited in size by the
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Rate at which substances needed by the cell can enter the cell through its surface
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Amount of material the cell can collect itself
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Rate at which the cell can manufacture the genetic information
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Amount of cell membrane the cell can produce
Explanation
As the cell size increases the surface area per unit volume decreases.
Therefore, the surface area would not allow materials to enter or leave the cell quickly enough to meet the cell's needs.
As a result, most cells are microscopic in size. Cell size is limited due to the inability of very large cells to provide nutrients and water and remove wastes in an efficient manner. The size of a cell is limited by the relationship of the cell's outer surface area to its volume or its surface area-to-volume ratio. Thus, the correct answer is option A.
Which of the following types of cell has a well-developed nucleus?
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Prokaryotic
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Eukaryotic
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Both A and B
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None of the above
Explanation
Eukaryotic cells contain a membrane-bound nucleus. The nuclear membrane that surrounds nucleus in eukaryotic cells gives the defined structure to the nucleus which consists genetic material and thus eukaryotic nucleus is called a well-developed nucleus.
Prokaryotes lack a membrane bound nucleus.
Hence, the correct option is B.
Tissue is formed by the combination of
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Organs
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Organ systems
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Cells
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Organisms
Explanation
Tissues form by the combination of cells. Organs form by the combination of tissues and organ systems form by the combination of different organs. All the organ systems combine and forms an organism.
So, the correct answer is (C).
Which of the following statements is true?
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The structural unit of living things is molecule.
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All animals are autotrophs.
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All organisms reproduce sexually.
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Organisms follow a life cycle of birth, growth, reproduction, ageing and death.
Explanation
All the living organism is made up of cells which constitute some organic and inorganic molecules and perform all the life process like nutrition (autotrophic or heterotrophic), reproduction (sexual or asexual), excretion.
Each cell arises from pre-existing cells, they divide and increase their numbers and has a certain life span, thus they undergo aging and then death. Thus, the correct answer is option D.
Each cell of unicelluler organism performs certain functions such as____________
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Nutrition
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Transport
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Excretion and reproduction
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All of the above
Explanation
In unicellular (single-celled) organisms, the single cell performs all life processes for survival such as nutrition, transport, excretion, and reproduction.
They do not depend on another cell for function and thus exist independently.
Living organisms are grouped into eukaryotes and prokaryotes on the basis of ____________.
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Nucleus
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Ribosomes
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Plasma membrane
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None of the above
Explanation
Eukaryotic cells have a well-defined nucleus with a nuclear membrane whereas prokaryotic cells do not have a well-defined nucleus and nuclear membrane.
Apart from the nucleus, other membrane-bound organelles like mitochondria, lysosomes, and Golgi complex, etc. are also absent in prokaryotes.
However, plasma membrane, cytoplasm, and ribosomes are present in both cell types.
Hence the correct option is A.
State whether the following statement is true or false.
Prokaryotes are organisms without a true nucleus.
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True
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False
Explanation
Eukaryotic cells have a "true" nucleus containing DNA whereas prokaryotic cells do not have a nucleus. This difference is considered the most important distinction among prokaryotic and eukaryotic organisms.
Hence, the correct answer is, 'True'.
The key difference in the animal and plant cells is:
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Absence of cell wall in animals
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Absence of plasma membrane in plants
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Absence of cell wall in plants
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There is no difference in their structure
Explanation
The following table illustrates the difference between the structures of a plant cell and an animal cell.
Animal cells
Plant cells
Cell wall absent
Cell wall present
Chloroplast absent
Chloroplast present
Vacuoles are small
Vacuoles are large, sap-filled in plant cells
As evident, the key distinguishing feature is the presence of a cell wall in a plant cell while it is absent in an animal cell.
Therefore, the correct answer is option A.
"Division of labour" in multicellular animals means:
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All functions are performed by a single type of cell.
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A function is performed jointly by many cells.
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Different functions are performed by different types of cells.
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Different functions are performed at different times by a single cell type.
Explanation
In a unicellular organism, a single cell has to perform all the
functions necessary for its survival.
M
ulticellular organisms are made up of many cells. They show d
ivision of labor in which different cells are specialized to perform different functions.
For example: Red blood cells carry oxygen to different organs, nerve cells carry information from different parts of the body to brain and vice versa.
Thus, the correct answer is option C.
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