This set of Class 11 Biology Chapter 8 Multiple Choice Questions & Answers (MCQs) focuses on “Cell The Unit of Life”. These MCQs are created based on the latest CBSE syllabus and the NCERT curriculum, offering valuable assistance for exam preparation.
1. Cells are the structural unit of life and all the organisms are made of cells.
a) True
b) False
View Answer
Explanation: Cells are the structural unit of life and all the organisms are made of cells. The size and shapes of the cells vary with organisms and their functions but on a whole most of them have identical components.
2. Which among the following is incorrect about the major discoveries in the history of cell?
a) Robert brown made the most major contribution to the history of cell by discovering nucleus
b) Cell theory was developed by Schleiden and Schwann
c) Virchow introduced the concept that genetic material is present inside the nucleus
d) Robert Hooke discovered cell in 1665
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Explanation: Robert Hooke discovered cell in 1665. Robert brown made the most major contribution to the history of cell by discovering nucleus. Cell theory was developed by Schleiden and Schwann. Virchow stated that the new cells arise from the pre-existing cells.
3. Which among the following is incorrect about types of cells?
a) In a prokaryotic cell membrane-bound organelles are absent
b) Monera is an example of prokaryotic cell
c) Eukaryotic cells contain membrane-bound organelles
d) Prokaryotic cells contain either RNA or DNA
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Explanation: In a prokaryotic cell membrane-bound organelles are absent. Monera is an example of prokaryotic cell. Eukaryotic cells contain membrane-bound organelles. Prokaryotic cells contain both RNA and DNA.
4. Which among the following is incorrect about different types of cells?
a) Size and shape of the cells vary with the functions they perform
b) In unicellular organism a single cell constitutes the entire organism
c) The components in all eukaryotic cells are more/less the same
d) Centrioles are present in plant cells but absent in animal cells
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Explanation: Size and shape of the cells vary with the functions they perform. In unicellular organism a single cell constitutes the entire organism. The components in all eukaryotic cells are more/less the same. Centrioles are present in animal cells but absent in plant cells.
5. Active transport requires energy to transport particles from lower concentration to higher concentration.
a) True
b) False
View Answer
Explanation: Active transport requires energy to transport particles from lower concentration to higher concentration. In passive transport, cell doesn’t expend any energy to transport particles across cells.
6. Energy for the transport of particles through active mode is derived from _______
a) ATP
b) ADP
c) Glucose
d) Lactic acids
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Explanation: Energy for the transport of particles through active mode is derived from ATP. In active mode of transportation, the transport of particle takes place against the concentration gradient. Therefore, active transport requires energy to transport particles.
7. Which among the following statements is incorrect about plasma membrane?
a) Plasma membrane is a selectively permeable membrane and allows only those particles that protect the cell
b) Movement of air and water takes place through diffusion and osmosis respectively
c) Osmosis and diffusion are examples of active transport
d) Active transport takes place through use of energy
View Answer
Explanation: Plasma membrane is a selectively permeable membrane and allows only those particles that protect the cell. Movement of air and water takes place through diffusion and osmosis respectively. Osmosis and diffusion are examples of passive transport. Active transport takes place through use of energy.
8. Which among the following is incorrect about the structure of plasma membrane?
a) Plasma membrane is made of lipids and proteins
b) Lipids with hydrophobic and hydrophilic end are called amphipathic lipids
c) The plasma membrane is a lipid bilayer membrane
d) The proteins that are present on the surface of the plasma membrane are called integral proteins
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Explanation: Plasma membrane is made of lipids and proteins. Lipids with hydrophobic and hydrophilic end are called amphipathic lipids. The plasma membrane is a lipid bilayer membrane. Integral proteins are not just present on the surface of the membrane but span along the entire width of the membrane.
9. Which among the following is incorrect about fluid mosaic model?
a) Plasma membrane was coined by Singer and Nicholson to be a fluid mosaic model
b) According to this model, the proteins are dispersed randomly on the surface and the interior of the plasma membrane
c) The word fluid in this model refers to the fluid flexible nature of the plasma membrane
d) The model fails to explain the cell growth and cell division
View Answer
Explanation: Plasma membrane was coined by Singer and Nicholson to be a fluid mosaic model. According to this model, the proteins are dispersed randomly on the surface and the interior of the plasma membrane. The word fluid in this model refers to the fluid flexible nature of the plasma membrane. The model explains the cell growth and cell division.
10. Which among the following is incorrect about the layers of the cell wall?
a) The cell wall is made of three main layers, namely, primary cell wall, secondary cell wall and middle lamella
b) Cell wall of a young plant is made of primary cell which composes a loose network of cellulose microfibrils
c) Secondary cell wall forms as the cell matures and composes cellulose and lignin
d) Middle lamella separates cells and is composed of sodium acetate
View Answer
Explanation: The cell wall is made of three main layers, namely, primary cell wall, secondary cell wall and middle lamella. Cell wall of a young plant is made of primary cell which composes a loose network of cellulose microfibrils. Secondary cell wall forms as the cell matures and composes cellulose and lignin. Middle lamella separates cells and is composed of calcium pectate.
11. Which among the following is incorrect about cell wall?
a) Cell wall provides mechanical supports and avoids rupture of cell in a hypotonic solution
b) Plasmodesmata are protein granules in the cell wall that provides mechanical support
c) Cell wall prevents the cell from invasion and injury
d) Cell wall is entirely permeable and rigid
View Answer
Explanation: Cell wall provides mechanical supports and avoids rupture of cell in a hypotonic solution. Plasmodesmata are tiny hole like structures that connects the cell walls of adjacent cells and facilitates communication between the cells. Cell wall is entirely permeable and rigid.
More MCQs on Class 11 Biology Chapter 8:
- Chapter 8 – Cell The Unit of Life MCQ (Set 2)
- Chapter 8 – Cell The Unit of Life MCQ (Set 3)
- Chapter 8 – Cell The Unit of Life MCQ (Set 4)
- Chapter 8 – Cell The Unit of Life MCQ (Set 5)
- Chapter 8 – Cell The Unit of Life MCQ (Set 6)
- Chapter 8 – Cell The Unit of Life MCQ (Set 7)
- Chapter 8 – Cell The Unit of Life MCQ (Set 8)
- Chapter 8 – Cell The Unit of Life MCQ (Set 9)
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