Cell theory and What is cell ? Questions in English

(C) The concept that new cells arise from pre-existing cells is known as the cell lineage theory or 'Omnis cellula-e cellula'. This was proposed by $Rudolph\, Virchow$ in $1855$. He modified the cell theory proposed by $Schleiden$ and $Schwann$ to include this statement,which explains how cells reproduce.

(C) The $Protoplasm$ is considered the physical basis of life and is the center for all metabolic activities within a cell. It includes the cytoplasm, nucleus, and organelles, providing the necessary environment for biochemical reactions to occur.

(B) The study of the structure,function,and behavior of cells is known as $Cell \ Biology$. While $Cytology$ specifically refers to the study of cell structure,$Cell \ Biology$ is the broader and more accurate term encompassing both structure and function. Therefore,option $B$ is the most appropriate answer.

(A) The term 'protoplasm' was coined by $Purkinje$ in $1839$. However, it was first observed and described by $Felix \text{ } Dujardin$ in $1835$ as 'sarcode'. $Corti$ $(1772)$ was the first scientist to observe the movement of protoplasm in plant cells, which he described as the 'fluid substance' of life. Therefore, based on historical context regarding the observation of the living substance within cells, $Corti$ is recognized for the first observation of protoplasmic movement.

(A) The cell theory was formulated by two scientists: $M.J. Schleiden$ (a German botanist) in $1838$ and $T. Schwann$ (a British zoologist) in $1839$.
$M.J. Schleiden$ observed that all plants are composed of different kinds of cells which form the tissues of the plant.
$T. Schwann$ reported that cells had a thin outer layer which is today known as the 'plasma membrane'.
Together,they proposed the cell theory.

(D) The Cell Theory states that all living organisms are composed of cells and that cells are the basic structural and functional units of life.
Viruses are considered an exception to the Cell Theory because they lack a cellular structure.
They consist only of genetic material ($DNA$ or $RNA$) enclosed within a protein coat (capsid) and require a host cell to replicate,meaning they do not possess the independent metabolic machinery characteristic of a cell.

(B) The cell theory was proposed by Matthias Schleiden and Theodor Schwann. It states that all living organisms are composed of cells and products of cells. Furthermore,it establishes that the cell is the basic structural and functional unit of all living organisms. Later,Rudolf Virchow added the concept of 'Omnis cellula-e cellula',which means all cells arise from pre-existing cells.

(A) The cell theory was proposed by Matthias Schleiden and Theodor Schwann. In $1838$, Matthias Schleiden, a German botanist, examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. At about the same time, in $1839$, Theodor Schwann, a British zoologist, studied different types of animal cells and reported that cells had a thin outer layer which is today known as the '$plasma membrane$'. He also concluded, based on his studies on plant tissues, that the presence of a cell wall is a unique character of the plant cells. On the basis of this, Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells.

(C) The human eye has a limit of resolution of approximately $100 \,\, \mu m$ $(0.1 \,\, mm)$.
Objects smaller than this size cannot be distinguished as individual entities by the naked eye.
Therefore,the smallest size of a cell that can be perceived without the aid of a microscope is $100 \,\, \mu m$.

(C) $C.P. Swanson$ is widely recognized as the father of modern cell biology for his significant contributions to the field of cytology and genetics.
$Robert Hooke$ is known for the discovery of the cell.
$Leeuwenhoek$ is known for the discovery of free-living cells like bacteria and protozoa.
Therefore,the correct option is $C$.

(B) The term $Protoplasm$ was first coined by $Johannes$ $Evangelista$ $Purkinje$ in $1839$.
$Purkinje$ used this term to describe the living substance of the cell.
$Dujardin$ originally called this substance $Sarcode$,but $Purkinje$ later introduced the term $Protoplasm$ to represent the physical basis of life.

(B) The phase-contrast microscope is an optical microscope that enhances contrast in transparent specimens.
It converts phase shifts in light waves into changes in light intensity.
This method allows for the observation of living cells without the need for staining,as it utilizes the differences in the refractive index of various cellular components.
Therefore,it is highly useful for the study of living cells.

(C) The term 'cell' was coined by the English scientist $Robert \ Hooke$ in $1665$.
He observed thin slices of cork under a primitive microscope and noticed small,box-like compartments which he named 'cells' (Latin: 'cellula',meaning a small room).

(B) In $1665$,Robert Hooke examined thin slices of cork under a primitive microscope. He observed that the cork appeared to be made of small,box-like compartments,which he termed 'cells' (from the Latin word 'cellula',meaning a small room). This discovery was published in his book 'Micrographia'.

(B) The statement "All tissues are composed of different cells" was proposed by $Theodor$ $Schwann$ in $1839$. $Schwann$ was a British Zoologist who studied different types of animal cells and reported that cells had a thin outer layer which is today known as the '$plasma$ $membrane$'. He also concluded that the presence of a cell wall is a unique character of plant cells. Based on his studies on plant and animal tissues, he proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells.

(C) The term 'physical basis of life' was coined by $Huxley$ for $Protoplasm$. $Protoplasm$ is the living content of the cell,which includes the cytoplasm and the nucleus. It is the site of all metabolic activities essential for life.

(B) The book 'Micrographia' was published in $1665$ by the English scientist $Robert$ $Hooke$.
In this book,he described his observations of cork slices under a microscope and coined the term 'cell' to describe the box-like structures he observed.

(A) Assertion $A$ states that every cell is a wonderful marvel of the world,which is a conceptual statement reflecting the complexity and efficiency of cellular life.
Reason $R$ explains that a cell takes in nutrients,converts them into energy (via respiration),and performs specialized functions (like protein synthesis,secretion,etc.).
These metabolic activities and the ability of the cell to maintain homeostasis and perform complex tasks justify why it is considered a marvel.
Therefore,$R$ correctly explains $A$.

(B) The cell was first discovered by the English scientist $Robert Hooke$ in $1665$. He observed thin slices of cork under a primitive microscope and noticed small,box-like compartments which he termed as 'cells' (Latin for 'little room').

(A) In $1665$,the English scientist $Robert Hooke$ examined a thin slice of cork under a self-designed primitive microscope. He observed that the cork resembled the structure of a honeycomb consisting of many little compartments. He coined the term '$cell$' (Latin for 'little room') to describe these units.

(C) The $Cell$ is defined as the fundamental structural and functional unit of all living organisms.
It is the smallest unit of life that can perform all biological processes necessary for survival, such as metabolism, growth, and reproduction.
While macromolecules and molecules are components of a cell, they do not possess the independent life-sustaining properties of a cell.
Organs are higher-level structures composed of various tissues working together.

(B) The term 'cell' was first coined by the English scientist $Robert \ Hooke$ in $1665$. He observed thin slices of cork under a primitive microscope and noticed that they consisted of small,box-like compartments,which he termed 'cells' (Latin for 'little rooms').

(A) Robert Hooke,in $1665$,examined thin slices of cork under his primitive microscope. Cork is a part of the bark of the oak tree ($Quercus$ $suber$). He observed small,box-like compartments and named them 'cells' (Latin for 'little room'). Therefore,the correct answer is $A$ (Oak).

(C) In $1665$,$Robert \ Hooke$ examined a thin slice of cork under a primitive microscope. He observed that the cork resembled the structure of a honeycomb,consisting of many small,box-like compartments. He named these structures '$cells$'. Thus,the correct answer is $Robert \ Hooke$.

(D) The fundamental characteristics of a cell include metabolism (converting nutrients to energy),reproduction,and the storage of genetic information $(DNA)$.
$DNA$ (Deoxyribonucleic acid) is the primary molecule responsible for heredity and the storage of genetic information in almost all living organisms.
Proteins are functional molecules that perform various tasks within the cell,but they are not the primary carriers of genetic information.
Therefore,the statement that protein is responsible for heredity is incorrect.

(D) The term 'cell' was coined by Robert Hooke in $1665$,not Robert Brown. Robert Brown is credited with the discovery of the nucleus in $1831$. Therefore,statement $S$ is false.
The cell is indeed the fundamental structural and functional unit of all living organisms. Therefore,statement $R$ is true.
Thus,$S$ is false and $R$ is true.

(A) Theodor $Schwann$ $(1839)$,a British Zoologist,studied different types of animal cells and reported that cells had a thin outer layer which is today known as the '$plasma membrane$'. He also concluded that the presence of a cell wall is a unique character of plant cells.

(C) The cell theory was proposed by $Matthias \ Schleiden$ (a German botanist) in $1838$ and $Theodor \ Schwann$ (a British zoologist) in $1839$. They collectively formulated the cell theory,which states that all living organisms are composed of cells and products of cells.

(C) The cell theory,as proposed by Matthias Schleiden and Theodor Schwann,stated that all living organisms are composed of cells and products of cells.
However,this theory failed to explain how new cells are formed.
It was later modified by Rudolf Virchow in $1855$,who proposed the concept of 'Omnis cellula-e cellula',which means that all cells arise from pre-existing cells.

(B) In $1838$,Matthias Schleiden,a German botanist,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant.

(A) The Cell Theory was proposed by Matthias Schleiden and Theodor Schwann.
$1$. It states that all living organisms are composed of cells and products of cells.
$2$. It states that the cell is the structural and functional unit of living organisms.
$3$. Rudolf Virchow later added the concept of 'Omnis cellula-e cellula',which means all cells arise from pre-existing cells.
Option $A$ is incorrect because the Cell Theory does not state that cells continue to differentiate throughout the entire lifespan of an organism; differentiation is a developmental process,not a fundamental tenet of the Cell Theory.

(C) In $1855$,Rudolf Virchow first explained that cells divide and new cells are formed from pre-existing cells. This concept is famously known as 'Omnis cellula-e cellula'. This addition completed the Cell Theory,which was originally proposed by Matthias Schleiden and Theodor Schwann.

(D) The cell theory was formulated by $M.J. Schleiden$ and $Theodor Schwann$.
Later,$Rudolf Virchow$ added the concept of $Omnis cellula-e cellula$,which means that all cells arise from pre-existing cells through cell division.
However,the fundamental postulate of the cell theory states that the cell is the basic structural and functional unit of all living organisms.
Option $D$ correctly identifies this fundamental aspect of the cell theory.

(C) Matthias Schleiden was a German botanist who,in $1838$,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. Thus,he concluded that the presence of cells is the basic unit of life in plants.

(B) Theodor Schwann $(1839)$ was a British zoologist who studied different types of animal cells and reported that cells had a thin outer layer which is today known as the 'plasma membrane'. He also concluded,based on his studies on plant tissues,that the presence of a cell wall is a unique character of plant cells. Together with Matthias Schleiden,he formulated the cell theory.

(C) The cell theory was proposed by Matthias Schleiden and Theodor Schwann. Matthias Schleiden,a German botanist,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. In $1838$,he reported that all plants are composed of cells. Theodor Schwann,a British zoologist,reported in $1839$ that animal cells had a thin outer layer which is today known as the 'plasma membrane'. Thus,the cell theory was formulated in the year $1838-1839$.

(D) In $1838$,Matthias Schleiden,a German botanist,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. Thus,option $D$ is the correct answer.

(A) In $1839$, $Theodor$ $Schwann$, a British Zoologist, reported that animal cells had a thin outer layer which is today known as the '$plasma$ $membrane$'.
He also concluded, based on his studies on plant tissues, that the presence of a cell wall is a unique character of plant cells.
Thus, the correct answer is $Theodor$ $Schwann$.

(B) The German botanist $Matthias$ $Schleiden$ $(1838)$ and British zoologist $Theodor$ $Schwann$ $(1839)$ proposed the cell theory.
$Schwann$ reported that animal cells had a thin outer layer which is today known as the '$Plasma$ $membrane$'.
He also concluded that the presence of a cell wall is a unique character of plant cells.
Therefore, the correct option is $(B)$.

(B) Theodor $Schwann$ $(1839)$, a British Zoologist, studied a large variety of animal and plant cells and reported that cells had a thin outer layer which is today known as the '$plasma membrane$'.
He also concluded, based on his studies on plant tissues, that the presence of a cell wall is a unique character of the plant cells.
Thus, $Schwann$ proposed that the presence of a cell wall is a unique character of plant cells.

(D) The cell theory was initially proposed by Matthias Schleiden and Theodor Schwann.
However,they did not explain how new cells were formed.
Rudolf Virchow in $1855$ first explained that cells divide and new cells are formed from pre-existing cells ($Omnis$ $cellula-e$ $cellula$).
This modification gave the cell theory its final shape.

(C) The cell theory was proposed by $Schleiden$ and $Schwann$. The main postulates are:
$1$. All living organisms are composed of cells and products of cells.
$2$. The cell is the structural and functional unit of life.
$3$. $Virchow$ later added that all cells arise from pre-existing cells ($Omnis$ $cellula-e$ $cellula$).
Option $C$ states that organisms possess a unicellular eukaryotic structure,which is not a part of the cell theory,as organisms can be unicellular or multicellular,and prokaryotic or eukaryotic.

(D) Rudolf Virchow modified the hypothesis of Schleiden and Schwann to give the cell theory a final shape by explaining that cells divide and new cells are formed from pre-existing cells ($Omnis$ $cellula-e$ $cellula$).
Option $A$ ($New$ $cells$ $arise$ $from$ $pre-existing$ $cells$) is associated with Virchow.
Option $B$ ($New$ $cells$ $come$ $into$ $existence$ $through$ $cell$ $division$) is associated with Virchow.
Option $C$ ($He$ $gave$ $the$ $final$ $shape$ $to$ $the$ $cell$ $theory$) is associated with Virchow.
Option $D$ ($The$ $cell$ $is$ $the$ $structural$ $and$ $functional$ $unit$ $of$ $life$) is a general statement of the cell theory proposed by Schleiden and Schwann, not specifically attributed to Virchow's contribution.

(B) The concept that the cell is the basic unit of life is a fundamental principle of the Cell Theory.
Robert Hooke was the first person to observe and describe cells in $1665$ using a primitive microscope while examining a thin slice of cork.
Although Schleiden and Schwann later formulated the formal Cell Theory,the initial discovery and naming of the 'cell' as the structural unit were done by Robert Hooke.

(B) The Cell Theory was proposed by Matthias Schleiden and Theodor Schwann. In $1838$,Matthias Schleiden,a German botanist,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. At about the same time,in $1839$,Theodor Schwann,a British zoologist,studied different types of animal cells and reported that cells had a thin outer layer which is today known as the 'plasma membrane'. He also concluded that the presence of a cell wall is a unique character of plant cells. On the basis of this,Schleiden and Schwann together formulated the Cell Theory.

(A) The concept that 'Omnis cellula-e cellula' (new cells arise from pre-existing cells) was proposed by Rudolf Virchow in $1855$. This statement modified the cell theory proposed by Schleiden and Schwann to explain how new cells are formed.

(A) In $1838$,Matthias Schleiden,a German botanist,examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. Thus,he proposed that the bodies of plants are made up of cells. Therefore,the correct answer is $A$.

(C) The cell is defined as the structural and functional unit of all living organisms,making the Assertion $(P)$ true.
According to the cell theory proposed by Rudolf Virchow ($Omnis$ $cellula-e$ $cellula$),new cells arise only from pre-existing cells.
Therefore,the statement in the Reason $(Q)$ that 'new cells do not arise from pre-existing cells' is scientifically incorrect.
Thus,$P$ is true and $Q$ is false.

(A) The concept 'Omnis cellula-e cellula',which means that new cells arise from pre-existing cells,was proposed by Rudolf Virchow in $1855$. This statement modified the cell theory proposed by Schleiden and Schwann,which did not explain how new cells were formed.

(D) The Cell Theory was proposed by Matthias Schleiden and Theodor Schwann. In $1838$,Matthias Schleiden,a German botanist,concluded that all plant tissues are made of cells. In $1839$,Theodor Schwann,a British zoologist,reported that animal cells had a thin outer layer which is today known as the 'plasma membrane'. He also concluded that the presence of a cell wall is a unique character of plant cells. Based on these hypotheses,Schleiden and Schwann together formulated the Cell Theory,which states that all living organisms are composed of cells and products of cells,thus establishing the cell as the structural and functional unit of life.