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All questions of Organization of the Organism for Grade 9 Exam
Living cells were discovered by- a)Robert Hooke
- b)Purkinje
- c)Leeuwenhoek
- d)Robert Brown
Correct answer is option 'C'. Can you explain this answer?
Living cells were discovered by
a)
Robert Hooke
b)
Purkinje
c)
Leeuwenhoek
d)
Robert Brown
|
Anita Menon answered |
Robert Hooke, a scientist, was the first person to discover the existence of cells with the help of a microscope in 1665 but they were dead cells.
Anton van Leeuwenhoek, in 1674 with the improved microscope, discovered free-living cells of algae Spirogyra in pond water for the first time.
Which organelle is called the suicide bag of the cell- a)Golgi bodies
- b)Centrosome
- c)Chloroplast
- d)Lysosome
Correct answer is option 'D'. Can you explain this answer?
Which organelle is called the suicide bag of the cell
a)
Golgi bodies
b)
Centrosome
c)
Chloroplast
d)
Lysosome
|
Ravi Verma answered |
Lysosomes are called suicide bags of the cells because they contain digestive enzymes to digest the food taken by cell and if these enzymes spread in the cell or the membrane of lysosomes break down then the digestive enzymes digest the whole cell and the cell dies
so they are called suicide bags of the cell
In which year the nucleus of the cell was discovered?- a)1813
- b)1665
- c)1674
- d)1831
Correct answer is 'D'. Can you explain this answer?
In which year the nucleus of the cell was discovered?
a)
1813
b)
1665
c)
1674
d)
1831
|
Nipun S answered |
It was discovered on 1831 by ROBERT BROWN
Can you explain the answer of this question below:Which microscope made it possible to observe the complex structure of cell and its organelles?
- A:
Simple
- B:
Electron
- C:
Light
- D:
Compound
The answer is b.
Which microscope made it possible to observe the complex structure of cell and its organelles?
Simple
Electron
Light
Compound
|
|
Amit Sharma answered |
Electron microscope is used to understand the complex structure of the cell and its various organelles. when was it discovered.
Name two cell regions containing their own genetic material.
- a)Chloroplast and mitochondria
- b)Lysosomes and ribosomes
- c)Nucleus and mitochondria
- d)Golgi apparatus and endoplasmic reticulum
Correct answer is option 'A'. Can you explain this answer?
Name two cell regions containing their own genetic material.
a)
Chloroplast and mitochondria
b)
Lysosomes and ribosomes
c)
Nucleus and mitochondria
d)
Golgi apparatus and endoplasmic reticulum
|
|
Ananya Sharma answered |
- Chloroplast and mitochondria are the only two organelles that contain their own genetic material.
- Besides containing genetic material they also contain 70S type ribosome, own enzymes and some amount of RNA as well.
- They can also undergo fission themselves and thus can multiply themselves.
- This is why these two organelles are called semi-autonomous organelles.
Which of the following is known as “physical basis of life”?- a)Nucleolus
- b)Gene
- c)Protoplasm
- d)Mitochondria
Correct answer is 'C'. Can you explain this answer?
Which of the following is known as “physical basis of life”?
a)
Nucleolus
b)
Gene
c)
Protoplasm
d)
Mitochondria
|
Prasenjit Kulkarni answered |
The physical basis of life is protoplasm which contains all the cell organelles present in the cell.
What is the full form of ATP?- a)Adenosine triphosphate
- b)Amino triphosphate
- c)Amino tetraphosphate
- d)Adenosine tetraphosphate
Correct answer is option 'A'. Can you explain this answer?
What is the full form of ATP?
a)
Adenosine triphosphate
b)
Amino triphosphate
c)
Amino tetraphosphate
d)
Adenosine tetraphosphate
|
Nilotpal Yadav answered |
Adenosine triphosphate (ATP)
Definition:
ATP stands for adenosine triphosphate. It is a molecule that serves as the primary energy currency of the cell. It is often referred to as the "energy currency" of the cell because it stores and releases energy for various cellular processes.
Structure:
ATP is composed of three main components:
1. Adenosine: It is a nucleoside composed of the nitrogenous base adenine and the sugar ribose.
2. Triphosphate: It refers to the presence of three phosphate groups attached to the ribose sugar molecule.
Function:
ATP is involved in several essential cellular processes, including:
1. Energy Storage and Release: ATP stores energy in the high-energy phosphate bonds between the phosphate groups. When one of these bonds is broken, energy is released, which can be used by the cell for various functions.
2. Cellular Work: ATP is utilized by cells to perform work, such as mechanical work (muscle contraction), transport work (active transport of molecules across cell membranes), and chemical work (synthesis of macromolecules).
3. Metabolic Reactions: ATP acts as a coenzyme in various metabolic reactions, facilitating the transfer of energy between different reactions.
4. Signal Transduction: ATP is involved in cell signaling processes, acting as a source of phosphate groups for the addition of phosphate to proteins and other molecules, thereby regulating their activity.
ATP Cycle:
The ATP cycle involves the continuous breakdown and regeneration of ATP. When energy is required by the cell, ATP is hydrolyzed to adenosine diphosphate (ADP) and inorganic phosphate (Pi), releasing energy. This energy is utilized for cellular processes. ADP and Pi can then be recombined to form ATP through cellular respiration, allowing the cycle to continue.
Importance:
ATP is crucial for the survival and functioning of cells. It is involved in almost all energy-requiring processes, including muscle contraction, nerve impulse transmission, protein synthesis, and active transport. Without ATP, cells would not be able to perform these functions and would eventually cease to function.
Conclusion:
ATP, or adenosine triphosphate, is a molecule that serves as the primary energy currency of the cell. It is involved in storing and releasing energy for various cellular processes. ATP plays a vital role in cell functioning and is essential for the survival of cells.
Definition:
ATP stands for adenosine triphosphate. It is a molecule that serves as the primary energy currency of the cell. It is often referred to as the "energy currency" of the cell because it stores and releases energy for various cellular processes.
Structure:
ATP is composed of three main components:
1. Adenosine: It is a nucleoside composed of the nitrogenous base adenine and the sugar ribose.
2. Triphosphate: It refers to the presence of three phosphate groups attached to the ribose sugar molecule.
Function:
ATP is involved in several essential cellular processes, including:
1. Energy Storage and Release: ATP stores energy in the high-energy phosphate bonds between the phosphate groups. When one of these bonds is broken, energy is released, which can be used by the cell for various functions.
2. Cellular Work: ATP is utilized by cells to perform work, such as mechanical work (muscle contraction), transport work (active transport of molecules across cell membranes), and chemical work (synthesis of macromolecules).
3. Metabolic Reactions: ATP acts as a coenzyme in various metabolic reactions, facilitating the transfer of energy between different reactions.
4. Signal Transduction: ATP is involved in cell signaling processes, acting as a source of phosphate groups for the addition of phosphate to proteins and other molecules, thereby regulating their activity.
ATP Cycle:
The ATP cycle involves the continuous breakdown and regeneration of ATP. When energy is required by the cell, ATP is hydrolyzed to adenosine diphosphate (ADP) and inorganic phosphate (Pi), releasing energy. This energy is utilized for cellular processes. ADP and Pi can then be recombined to form ATP through cellular respiration, allowing the cycle to continue.
Importance:
ATP is crucial for the survival and functioning of cells. It is involved in almost all energy-requiring processes, including muscle contraction, nerve impulse transmission, protein synthesis, and active transport. Without ATP, cells would not be able to perform these functions and would eventually cease to function.
Conclusion:
ATP, or adenosine triphosphate, is a molecule that serves as the primary energy currency of the cell. It is involved in storing and releasing energy for various cellular processes. ATP plays a vital role in cell functioning and is essential for the survival of cells.
Which statement is false with respect to multi-cellular organisms?- a)Multicellular organisms show division of labour.
- b)In multi-cellular organisms, groups of cells perform specific roles.
- c)Different groups of cells are inter-dependent on each other for their continued existence.
- d)All the cells perform the same function in a multi-cellular organism.
Correct answer is option 'D'. Can you explain this answer?
Which statement is false with respect to multi-cellular organisms?
a)
Multicellular organisms show division of labour.
b)
In multi-cellular organisms, groups of cells perform specific roles.
c)
Different groups of cells are inter-dependent on each other for their continued existence.
d)
All the cells perform the same function in a multi-cellular organism.
|
Hansa Sharma answered |
Unicellular organisms are made up of only one cell that carries out all the functions needed by the organism, while multicellular organisms use many different cells to function. Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions
Can you explain the answer of this question below:Which cell organelle is analogous to a power station?- A:Golgi body
- B:Lysosomes
- C:Endoplasmic Reticulum
- D:Mitochondria
The answer is d.
Which cell organelle is analogous to a power station?
A:
Golgi body
B:
Lysosomes
C:
Endoplasmic Reticulum
D:
Mitochondria
|
Destroyed answered |
Mitochondria is called the power house of cell. This means it takes in nutrients from the cell, breaks it down, and turns it into energy. This energy is then in turn used by the cell to carry out various functions.Tha extra energy is stored in mitochondria ,so that it can be used in the time of need .
The cells present in cork slice are:- a)Live cells
- b)Bacterial cell
- c)Animal cells
- d)Dead cells
Correct answer is 'D'. Can you explain this answer?
The cells present in cork slice are:
a)
Live cells
b)
Bacterial cell
c)
Animal cells
d)
Dead cells
|
Prachi Rathore answered |
Cells of cork slice are non living. hence the cells are dead cells.
Which of the following organelles is smallest in size?- a)Ribosome
- b)Mitochondrial
- c)Chloroplast
- d)Lysosome
Correct answer is option 'A'. Can you explain this answer?
Which of the following organelles is smallest in size?
a)
Ribosome
b)
Mitochondrial
c)
Chloroplast
d)
Lysosome
|
|
Arun Sharma answered |
Ribosomes are primary site of protein synthesis or translation and measure 20 nm.
Lysosomes or "suicidal bags" of the cell measure 200 nm.
Mitochondria, the powerhouse of the cell are site of cellular respiration measures 3000 nm
Chloroplast is the site of photosynthesis and measures 5000 nm.
Therefore, ribosomes are smallest of all.
Lysosomes or "suicidal bags" of the cell measure 200 nm.
Mitochondria, the powerhouse of the cell are site of cellular respiration measures 3000 nm
Chloroplast is the site of photosynthesis and measures 5000 nm.
Therefore, ribosomes are smallest of all.
Animal cells do not show the presence of- a)Cell membrane
- b)Cytoplam
- c)Cell wall
- d)Nucleus
Correct answer is option 'C'. Can you explain this answer?
Animal cells do not show the presence of
a)
Cell membrane
b)
Cytoplam
c)
Cell wall
d)
Nucleus
|
Geetika Shah answered |
Animal cells do not have cell Wall because they do not need them. Cell walls , which are found in plant cells , maintain cell shape, almost as if each cell has its own exoskeleton.
The cell organelles (other than the nucleus) which contain DNA are- a)plastids and lysosomes
- b)mitochondria and Golgi apparatus
- c)Golgi apparatus and lysosomes
- d)plastids and mitochondria
Correct answer is option 'D'. Can you explain this answer?
The cell organelles (other than the nucleus) which contain DNA are
a)
plastids and lysosomes
b)
mitochondria and Golgi apparatus
c)
Golgi apparatus and lysosomes
d)
plastids and mitochondria
|
Mohit Rajpoot answered |
Both mitochondria and plastids possess their own genetic material and ribosomes .
The mitochondria DNA and plastid DNA possess genes which produce the proteins necessary for the functioning of mitochondria and plastids respectively.
Match the following with the correct response.
- a)1-C, 2-B, 3-D, 4-A
- b)1-B, 2-D, 3-A, 4-C
- c)1-D, 2-A, 3-C, 4-B
- d)1-A, 2-C, 3-B, 4-D
Correct answer is option 'C'. Can you explain this answer?
Match the following with the correct response.
a)
1-C, 2-B, 3-D, 4-A
b)
1-B, 2-D, 3-A, 4-C
c)
1-D, 2-A, 3-C, 4-B
d)
1-A, 2-C, 3-B, 4-D
|
Krishna Iyer answered |
Cell wall - Plant Cells
Power house of cell - Mitochondria
Photosynthesis - Chloroplast
Protein synthesis Ribosomes
Power house of cell - Mitochondria
Photosynthesis - Chloroplast
Protein synthesis Ribosomes
Which of the following is not a function of golgi apparatus?
- a)Site of protein synthesis
- b)Storage and packaging of products
- c)Formation of lysosomes
- d)Production of complex sugars
Correct answer is option 'A'. Can you explain this answer?
Which of the following is not a function of golgi apparatus?
a)
Site of protein synthesis
b)
Storage and packaging of products
c)
Formation of lysosomes
d)
Production of complex sugars
|
Anirban Unni answered |
The Golgi apparatus links carbohydrates with proteins coming from ER to form glycoproteins. This process is called glycosylation. Golgi complex brings about membrane transformation, that is, converting one type of membrane (e.g., that of ER) into other types (e.g., selectively permeable plasma membrane, differentiated membrane of lysosome). This complex also takes part in the recycling of plasma membrane. The Golgi complex modifies, sorts and packages proteins and lipids coming from the ER. Packaging involves wrapping the material by a membrane, forming secretory vesicles. The secretory vesicles pinch off from the ends of the cisternae and appear as dense secretory or zymogen granules in the cytoplasm. Later, these vesicles release their secretions by exocytosis or revere pinocytosis.
Site of protein synthesis is ribosomes.
So, the correct answer is 'Ribosomes'.
Following are a few definitions of osmosis. Read carefully and select the correct definition. - a)Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane
- b)Movement of solvent molecules from its higher concentration to lower concentration
- c)Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane
- d)Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane
Correct answer is option 'A'. Can you explain this answer?
Following are a few definitions of osmosis. Read carefully and select the correct definition.
a)
Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane
b)
Movement of solvent molecules from its higher concentration to lower concentration
c)
Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane
d)
Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane
|
|
Raghav Bansal answered |
Osmosis is the passive movement of water or any other solvent molecules from a region of higher water concentration to a region of lower water concentration through a semipermeable membrane. This brings both the solutions separated by the semipermeable membrane to the equilibrium. Therefore, option A is correct.
A prokaryotic cell does not possess- a)cell membrane
- b)cell wall
- c)nuclear membrane
- d)both (a) and (c)
Correct answer is option 'C'. Can you explain this answer?
A prokaryotic cell does not possess
a)
cell membrane
b)
cell wall
c)
nuclear membrane
d)
both (a) and (c)
|
|
Moonlight Stargirl answered |
Prokaryotic cells have no nuclear membrane thus there nucleus is considered not well defined
The proteins and lipids, essential for building the cell membrane, are manufactured by- a)rough endoplasmic reticulum
- b)Golgi apparatus
- c)plasma membrane
- d)mitochondria
Correct answer is option 'A'. Can you explain this answer?
The proteins and lipids, essential for building the cell membrane, are manufactured by
a)
rough endoplasmic reticulum
b)
Golgi apparatus
c)
plasma membrane
d)
mitochondria
|
Keshav Kapoor answered |
Yes because ribosomes are sites are protein manufacture and they are found attached to the rough ER
If a plant cell is kept in a hypotonic solution, it will
- a)Increase in its volume
- b)Maintain the same volume
- c)Decrease in its volume
- d)Burst
Correct answer is option 'A'. Can you explain this answer?
If a plant cell is kept in a hypotonic solution, it will
a)
Increase in its volume
b)
Maintain the same volume
c)
Decrease in its volume
d)
Burst
|
|
Hansa Sharma answered |
When the plant cell is placed in a hypotonic solution , it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting.
In which year the nucleus of the cell was discovered?- a)1813
- b)1665
- c)1674
- d)1831
Correct answer is 'D'. Can you explain this answer?
In which year the nucleus of the cell was discovered?
a)
1813
b)
1665
c)
1674
d)
1831
|
Ishita Kumar answered |
Robert Brown discovered the nucleus in the cell in the year of in 1831.
Nucleoid is a feature of- a)Bacteria
- b)Amoeba
- c)Humans
- d)Birds
Correct answer is option 'A'. Can you explain this answer?
Nucleoid is a feature of
a)
Bacteria
b)
Amoeba
c)
Humans
d)
Birds
|
Bartta Dutta answered |
Bacterium is a prokaryotic cell. pro means primitive and karyon means nucleus . Hence a prokaryotic cell like bacteria contains amembrenous ( without membrane) nuclear material called nucleoid which remains scattered in the cytoplasm.
Cell wall is mainly made up of- a)Maltose
- b)Cellulose
- c)Sucrose
- d)Fructose
Correct answer is option 'B'. Can you explain this answer?
Cell wall is mainly made up of
a)
Maltose
b)
Cellulose
c)
Sucrose
d)
Fructose
|
|
Ravi Verma answered |
In the primary (growing) plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix.
The only cell organelle present in prokaryotic cell is - a)mitochondria
- b)ribosome
- c)plastids
- d)lysosome
Correct answer is option 'B'. Can you explain this answer?
The only cell organelle present in prokaryotic cell is
a)
mitochondria
b)
ribosome
c)
plastids
d)
lysosome
|
Lokesh Kumar answered |
Ribosomes are a cell structure that makes protein. Protein is needed for many cell functions such as repairing damage or directing chemical processes. Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum.
Which term describes the entire content of a living cell, including the cytoplasm and the nucleus, and is often referred to as the living substance of the cell?
- a)Protoplasm
- b)Ooplasm
- c)Nucleoplasm
- d)Cytoplasm
Correct answer is option 'A'. Can you explain this answer?
Which term describes the entire content of a living cell, including the cytoplasm and the nucleus, and is often referred to as the living substance of the cell?
a)
Protoplasm
b)
Ooplasm
c)
Nucleoplasm
d)
Cytoplasm
|
|
Ravi Verma answered |
The term used to describe the entire content of a living cell, including the cytoplasm and the nucleus, is "protoplasm." Protoplasm is often referred to as the living substance of the cell.
If dried apricots are initially placed in plain water for some time and then into a concentrated solution of sugar, they will:- a)Initially shrink and then swell
- b)Burst
- c)Initially swell and then shrink
- d)Initially swell and then burst
Correct answer is option 'C'. Can you explain this answer?
If dried apricots are initially placed in plain water for some time and then into a concentrated solution of sugar, they will:
a)
Initially shrink and then swell
b)
Burst
c)
Initially swell and then shrink
d)
Initially swell and then burst
|
Yashika Gupta answered |
Explanation:
When dried apricots are initially placed in plain water, they absorb water and swell up. This is due to the process of osmosis, where water moves from an area of high concentration (plain water) to an area of low concentration (inside the apricot).
However, when the apricots are then placed in a concentrated solution of sugar, the opposite process occurs. The high concentration of sugar in the solution draws water out of the apricots through osmosis. This causes the apricots to shrink.
Therefore, the overall effect of placing dried apricots in water and then a concentrated sugar solution is that they initially swell and then shrink.
Summary:
- Dried apricots initially absorb water and swell up in plain water
- Placing them in a concentrated sugar solution causes water to be drawn out of the apricots through osmosis
- This causes the apricots to shrink after initially swelling up
When dried apricots are initially placed in plain water, they absorb water and swell up. This is due to the process of osmosis, where water moves from an area of high concentration (plain water) to an area of low concentration (inside the apricot).
However, when the apricots are then placed in a concentrated solution of sugar, the opposite process occurs. The high concentration of sugar in the solution draws water out of the apricots through osmosis. This causes the apricots to shrink.
Therefore, the overall effect of placing dried apricots in water and then a concentrated sugar solution is that they initially swell and then shrink.
Summary:
- Dried apricots initially absorb water and swell up in plain water
- Placing them in a concentrated sugar solution causes water to be drawn out of the apricots through osmosis
- This causes the apricots to shrink after initially swelling up
A cell will swell up if- a)the concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium
- b)the concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell
- c)the concentration of water molecules is same in the cell and in the surrounding medium
- d)concentration of water molecules does not matter
Correct answer is option 'B'. Can you explain this answer?
A cell will swell up if
a)
the concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium
b)
the concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell
c)
the concentration of water molecules is same in the cell and in the surrounding medium
d)
concentration of water molecules does not matter
|
|
Madhu answered |
Option b
Engulfing of food materials or foreign bodies by cells like Amoeba is called- a)diffusion
- b)endocytosis
- c)osmosis
- d)plasmolysis
Correct answer is option 'B'. Can you explain this answer?
Engulfing of food materials or foreign bodies by cells like Amoeba is called
a)
diffusion
b)
endocytosis
c)
osmosis
d)
plasmolysis
|
|
Arun Sharma answered |
Organisms like Amoeba have flexible cell membrane due to which they can take in food material or engulf foreign bodies through the process called endocytosis.
Can you explain the answer of this question below:The presence of various cell organelles within the cell helps in- A:Larger size of the cell
- B:Decoration of the cell
- C:Crowding of the cell
- D:Division of labour
The answer is d.
The presence of various cell organelles within the cell helps in
A:
Larger size of the cell
B:
Decoration of the cell
C:
Crowding of the cell
D:
Division of labour
|
Rohini Seth answered |
In order for cells to function and survive, their organelles work together to carry out specific tasks and perform specific roles. Each organelle has its own role that contributes to the survival of the cell. This is called thr Division of labour.
What will happen, a when a human RBC is a placed in a hypotonic environment?- a)It undergoes plasmolysis
- b)It undergoes turgidity
- c)It is at equilibrium
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
What will happen, a when a human RBC is a placed in a hypotonic environment?
a)
It undergoes plasmolysis
b)
It undergoes turgidity
c)
It is at equilibrium
d)
None of these
|
|
Gaurav Kumar answered |
RBCs (Red Blood Corpuscles) will swell if they are placed in a hypotonic solution. The cells will gain water by osmosis. The cells might burst and rupture if they are placed in hypotonic solution for a longer time.
Name the plastids in which starch, oils and protein granules are stored?- a)Leucoplasts
- b)Chloroplasts
- c)Chromoplasts
- d)Protoplasts
Correct answer is option 'A'. Can you explain this answer?
Name the plastids in which starch, oils and protein granules are stored?
a)
Leucoplasts
b)
Chloroplasts
c)
Chromoplasts
d)
Protoplasts
|
|
Ravi Verma answered |
Leucoplasts are cell structures surrounded by a layer of tissue in plant cells. They store starch, oil, and the protein granules. They are a category of plastids. They are colorless as compared to the other plastids like chloroplast. They are located in tissues such as roots, bulbs, and seeds.
Find out the correct sentence. - a)Enzymes packed in lysosomes are made through RER
- b)Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively
- c)Endoplasmic reticulum is related to the destruction of plasma membrane
- d)Nucleoid is present inside the nucleoplasm of eukaryotic nucleus
Correct answer is option 'A'. Can you explain this answer?
Find out the correct sentence.
a)
Enzymes packed in lysosomes are made through RER
b)
Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively
c)
Endoplasmic reticulum is related to the destruction of plasma membrane
d)
Nucleoid is present inside the nucleoplasm of eukaryotic nucleus
|
|
Ananya Das answered |
Option B: Rough endoplasmic reticulum produce proteins and smooth endoplasmic reticulum produce lipids. Hence, given statement is wrong.
Option C: Endoplasmic reticulum is related with the making of plasma membrane. It makes the proteins (with the help of ribosomes) and lipids which are used for membrane synthesis. Hence, given statement is false.
Option D: Nuclear material of a prokaryotic cell consists of a single chromosome which is not membrane bound and lies naked in cytoplasm. Such, nuclear region of cytoplasm is called as nucleoid. Hence, given statement is wrong.
Option A: Lysosomal enzymes are made by rough endoplasmic reticulum. The ribosomes present on rough endoplasmic reticulum are involved in protein synthesis. Almost all enzymes are proteins
So, the correct answer is 'Enzymes packed in lysosomes are made through RER (rough endoplasmic reticulum)'
Animal cell lacking nuclei would also lack in- a)Endoplasmic reticulum
- b)Chromosome
- c)Lysosome
- d)Ribosome
Correct answer is option 'B'. Can you explain this answer?
Animal cell lacking nuclei would also lack in
a)
Endoplasmic reticulum
b)
Chromosome
c)
Lysosome
d)
Ribosome
|
|
Ananya Sharma answered |
Animal cell lacking nuclei would also lack in chromosome. As nucleus of a non-dividing cell contains chromatin which is uncoiled thread-like material of chromosome. Chromatin contains a DNA molecule and almost equal amount of basic histone proteins. Chromosomes occur during cell division and they are formed due to coiling and folding of chromatin.
Which of the following acts as garbage disposal system of the cell?- a)Golgi body
- b)Vacuole
- c)Peroxisome
- d)Lysosome
Correct answer is option 'D'. Can you explain this answer?
Which of the following acts as garbage disposal system of the cell?
a)
Golgi body
b)
Vacuole
c)
Peroxisome
d)
Lysosome
|
Keerthana Chavan answered |
Lysosomes present in the cytoplasm of cell contain very strong enzymes that can breakdown the all organic wastes produced in the cell. So, lysosome is called as garbage disposal system of the cell.
Nuclei were first discovered by- a)Strasburger
- b)Fonatana
- c)Robert Brown
- d)Robert Koch
Correct answer is option 'C'. Can you explain this answer?
Nuclei were first discovered by
a)
Strasburger
b)
Fonatana
c)
Robert Brown
d)
Robert Koch
|
Anuj Mudgal answered |
It's obvious bczzz Robert Brown discovered Nucleus a cell after Robert Hooke discovered the Cell. ...
A plant cell becomes swollen due to:- a)Endosmosis
- b)Plasmolysis
- c)Exosmosis
- d)Electrolysis
Correct answer is option 'A'. Can you explain this answer?
A plant cell becomes swollen due to:
a)
Endosmosis
b)
Plasmolysis
c)
Exosmosis
d)
Electrolysis
|
Nisha Jha answered |
A plant cell becomes swollen due to endosmosis.. because in it water enters the cell and it becomes swollen...
70-80 % of volume of a mature plant cell is occupied by- a)endoplasmic reticulum
- b)nucleus
- c)cytoplasm
- d)vacuole
Correct answer is option 'D'. Can you explain this answer?
70-80 % of volume of a mature plant cell is occupied by
a)
endoplasmic reticulum
b)
nucleus
c)
cytoplasm
d)
vacuole
|
|
Naina Sharma answered |
The mature cell has simple tissues rather than meristematic tissues so they will not divide and plant cell needs vacuole to make itself rigid and various excretion and storage works are also done by the vacuoles.
So, the vacuoles perform majority of the tasks of the plant cell and hence this is the reason, a mature plant cell has 70-80% of vacuoles in them.
The fine roots of plants absorb water from the soil through the process of- a)Osmosis
- b)Endocytosis
- c)Diffusion
- d)Pinocytosis
Correct answer is 'A'. Can you explain this answer?
The fine roots of plants absorb water from the soil through the process of
a)
Osmosis
b)
Endocytosis
c)
Diffusion
d)
Pinocytosis
|
Priya Rai answered |
Since water concentration is more in soil(outside the roots) in comparison to concentration of water inside roots. As a result, water will start flowing from soil to roots & this process of movement of water from higher concentration to lower concentration is called osmosis.
The only cell organelle seen in prokaryotic cell is - a)mitochondria
- b)ribosomes
- c)plastids
- d)lysosomes
Correct answer is option 'B'. Can you explain this answer?
The only cell organelle seen in prokaryotic cell is
a)
mitochondria
b)
ribosomes
c)
plastids
d)
lysosomes
|
|
Aradhiya Gupta answered |
Ribosome because it is membraneless organelles and also prokaryoted are those having not nuclear membrane
The membrane of Golgi apparatus has connections with those of- a)nuclear membrane
- b)endoplasmic reticulum
- c)cell membrane
- d)mitochondria
Correct answer is option 'B'. Can you explain this answer?
The membrane of Golgi apparatus has connections with those of
a)
nuclear membrane
b)
endoplasmic reticulum
c)
cell membrane
d)
mitochondria
|
|
Gaurav Kumar answered |
The Golgi apparatus receives proteins and lipids (fats) from the rough endoplasmic reticulum.
It modifies some of them and sorts, concentrates and packs them into sealed droplets called vesicles.
Which biologist proposed the cell theory along with Schwann?- a)Matthias Jakob Schleiden
- b)Robert Brown
- c)Purkinje
- d)Virchow
Correct answer is 'A'. Can you explain this answer?
Which biologist proposed the cell theory along with Schwann?
a)
Matthias Jakob Schleiden
b)
Robert Brown
c)
Purkinje
d)
Virchow
|
|
Kiara Singh answered |
**Biologist who proposed the cell theory along with Schwann:**
The biologist who proposed the cell theory along with Schwann is **Matthias Jakob Schleiden**. He was a German botanist who, along with Theodor Schwann, contributed significantly to the development of the cell theory.
**Explanation:**
The cell theory is one of the fundamental concepts in biology, stating that all living organisms are composed of cells, cells are the basic units of structure and function in living organisms, and new cells arise from pre-existing cells. This theory was proposed in the 1830s, and Schleiden and Schwann played crucial roles in its formulation.
**Matthias Jakob Schleiden:**
Matthias Jakob Schleiden was a German botanist who is best known for his work on plant cytology. He studied plant tissues and published his observations and conclusions in a book titled "Contributions to Phytogenesis" in 1838. In this book, Schleiden proposed that plants are made up of cells and that the cell is the basic unit of plant structure.
**Theodor Schwann:**
Theodor Schwann was a German physiologist who is best known for his work on animal tissues. He studied different types of animal tissues and published his findings in a book titled "Microscopic Investigations on the Accordance in the Structure and Growth of Animals and Plants" in 1839. In this book, Schwann proposed that animals are also composed of cells and that the cell is the basic unit of animal structure.
**Collaboration and Development of the Cell Theory:**
Schleiden and Schwann were colleagues and friends who shared their research findings with each other. They corresponded extensively and discussed their ideas on the similarities between plant and animal tissues. Based on their observations and discussions, they came to the conclusion that all living organisms are composed of cells and that the cell is the basic unit of structure and function.
Their collaborative work and ideas formed the foundation of the cell theory. Schleiden and Schwann's contribution to the development of the cell theory is significant, as it laid the groundwork for our understanding of the fundamental unit of life and revolutionized the field of biology.
In conclusion, Matthias Jakob Schleiden, along with Theodor Schwann, proposed the cell theory, which states that all living organisms are composed of cells and that cells are the basic units of structure and function. Their collaborative work was crucial in establishing the cell theory and revolutionizing the field of biology.
The biologist who proposed the cell theory along with Schwann is **Matthias Jakob Schleiden**. He was a German botanist who, along with Theodor Schwann, contributed significantly to the development of the cell theory.
**Explanation:**
The cell theory is one of the fundamental concepts in biology, stating that all living organisms are composed of cells, cells are the basic units of structure and function in living organisms, and new cells arise from pre-existing cells. This theory was proposed in the 1830s, and Schleiden and Schwann played crucial roles in its formulation.
**Matthias Jakob Schleiden:**
Matthias Jakob Schleiden was a German botanist who is best known for his work on plant cytology. He studied plant tissues and published his observations and conclusions in a book titled "Contributions to Phytogenesis" in 1838. In this book, Schleiden proposed that plants are made up of cells and that the cell is the basic unit of plant structure.
**Theodor Schwann:**
Theodor Schwann was a German physiologist who is best known for his work on animal tissues. He studied different types of animal tissues and published his findings in a book titled "Microscopic Investigations on the Accordance in the Structure and Growth of Animals and Plants" in 1839. In this book, Schwann proposed that animals are also composed of cells and that the cell is the basic unit of animal structure.
**Collaboration and Development of the Cell Theory:**
Schleiden and Schwann were colleagues and friends who shared their research findings with each other. They corresponded extensively and discussed their ideas on the similarities between plant and animal tissues. Based on their observations and discussions, they came to the conclusion that all living organisms are composed of cells and that the cell is the basic unit of structure and function.
Their collaborative work and ideas formed the foundation of the cell theory. Schleiden and Schwann's contribution to the development of the cell theory is significant, as it laid the groundwork for our understanding of the fundamental unit of life and revolutionized the field of biology.
In conclusion, Matthias Jakob Schleiden, along with Theodor Schwann, proposed the cell theory, which states that all living organisms are composed of cells and that cells are the basic units of structure and function. Their collaborative work was crucial in establishing the cell theory and revolutionizing the field of biology.
Which organelle releases energy?- a)Golgi Apparatus
- b)Chloroplast
- c)Ribosome
- d)Mitochondria
Correct answer is option 'D'. Can you explain this answer?
Which organelle releases energy?
a)
Golgi Apparatus
b)
Chloroplast
c)
Ribosome
d)
Mitochondria
|
Sandeep Saini answered |
Mitochondria are called as power house of the cell because it contain enzymes for cellular respiration in which energy is released in form of ATP.
Which microscope made it possible to observe the complex structure of cell and its organelles?- a)Simple
- b)Electron
- c)Light
- d)Compound
Correct answer is 'B'. Can you explain this answer?
Which microscope made it possible to observe the complex structure of cell and its organelles?
a)
Simple
b)
Electron
c)
Light
d)
Compound
|
Anjana Tiwari answered |
Electron microscope is used to understand the complex structure of the cell and its various organelles. when was it discovered.
A cell placed in solution swells up. The solution is:- a)Hypertonic
- b)Isotonic
- c)Hypotonic
- d)Both A and B
Correct answer is option 'C'. Can you explain this answer?
A cell placed in solution swells up. The solution is:
a)
Hypertonic
b)
Isotonic
c)
Hypotonic
d)
Both A and B
|
Jyoti Kapoor answered |
Cell is kept in hypotonic solution then due to osmosis the solvent particles enter into the cell termed as endosmosis which results in bulging of the cell this state is termed as turgid cell.
Can you explain the answer of this question below:Cell wall is absent in
- A:
Plants
- B:
Bacteria
- C:
Fungi
- D:
Mycoplasma
The answer is d.
Cell wall is absent in
Plants
Bacteria
Fungi
Mycoplasma
|
|
Prachi Rathore answered |
Mycoplasma. Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis. They can be parasitic or saprotrophic.
Find the incorrect statement regarding cell organelles from the following:- a)A cell functions because of its organelles.
- b)The organelles help in division of labour in the cell.
- c)Cell organelles are present outside each cell.
- d)Each kind of cell organelle performs a special function.
Correct answer is 'C'. Can you explain this answer?
Find the incorrect statement regarding cell organelles from the following:
a)
A cell functions because of its organelles.
b)
The organelles help in division of labour in the cell.
c)
Cell organelles are present outside each cell.
d)
Each kind of cell organelle performs a special function.
|
sujal singhal answered |
Many of the organelles found in cells are made up of or are surrounded by membrane and, therefore,would not be found in prokaryotic cells. cytoplasmType of cell: both plant and animalLocation: found inside the cell membrane but outside the nucleusDescription: clear, thick, jellylike material; contains a large amount of water (about 70%) and chemicals;may sometimes appear to be grainy (this grainy appearance comes from the organelles floating in it)Function: contains all the organelles outside of the nucleusOther: the cytoplasm is constantly moving or “streaming” through the cell.
Which cell organelle is analogous to a power station?- a)Golgi body
- b)Lysosomes
- c)Endoplasmic Reticulum
- d)Mitochondria
Correct answer is option 'D'. Can you explain this answer?
Which cell organelle is analogous to a power station?
a)
Golgi body
b)
Lysosomes
c)
Endoplasmic Reticulum
d)
Mitochondria
|
|
Kalyan Chauhan answered |
Mitochondria as a Power Station:
Mitochondria are often referred to as the powerhouses of the cell because they are responsible for generating the majority of the cell's energy. They are found in eukaryotic cells, which are cells with a nucleus and other membrane-bound organelles. Mitochondria are essential to the survival of the cell and are involved in a wide range of cellular activities.
Explanation:
Mitochondria are responsible for a process called cellular respiration, which is how cells convert food into energy. The food molecules are broken down in a series of chemical reactions, and the energy released is used to make a molecule called ATP (adenosine triphosphate). ATP is the cell's primary source of energy, and it is used for a wide range of cellular activities, including movement, growth, and repair.
Mitochondria have a unique structure that allows them to carry out this process efficiently. They have an outer membrane that is smooth and a highly folded inner membrane. The folds in the inner membrane are called cristae, and they increase the surface area of the membrane, which allows for more chemical reactions to occur. The space between the two membranes is called the intermembrane space.
Mitochondria also contain their own DNA, which is separate from the cell's DNA. This is because mitochondria are thought to have evolved from bacteria that were engulfed by ancient cells. Over time, the two organisms became dependent on each other, and the bacteria evolved into the mitochondria we see today.
Conclusion:
In summary, mitochondria are analogous to a power station because they generate the majority of the cell's energy. They do this through a process called cellular respiration, which involves breaking down food molecules and using the energy released to make ATP. Mitochondria have a unique structure that allows them to carry out this process efficiently, and they contain their own DNA.
Mitochondria are often referred to as the powerhouses of the cell because they are responsible for generating the majority of the cell's energy. They are found in eukaryotic cells, which are cells with a nucleus and other membrane-bound organelles. Mitochondria are essential to the survival of the cell and are involved in a wide range of cellular activities.
Explanation:
Mitochondria are responsible for a process called cellular respiration, which is how cells convert food into energy. The food molecules are broken down in a series of chemical reactions, and the energy released is used to make a molecule called ATP (adenosine triphosphate). ATP is the cell's primary source of energy, and it is used for a wide range of cellular activities, including movement, growth, and repair.
Mitochondria have a unique structure that allows them to carry out this process efficiently. They have an outer membrane that is smooth and a highly folded inner membrane. The folds in the inner membrane are called cristae, and they increase the surface area of the membrane, which allows for more chemical reactions to occur. The space between the two membranes is called the intermembrane space.
Mitochondria also contain their own DNA, which is separate from the cell's DNA. This is because mitochondria are thought to have evolved from bacteria that were engulfed by ancient cells. Over time, the two organisms became dependent on each other, and the bacteria evolved into the mitochondria we see today.
Conclusion:
In summary, mitochondria are analogous to a power station because they generate the majority of the cell's energy. They do this through a process called cellular respiration, which involves breaking down food molecules and using the energy released to make ATP. Mitochondria have a unique structure that allows them to carry out this process efficiently, and they contain their own DNA.
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