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Class 11 Biology MCQ Chapter 8 Cell: The Unit of Life
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Cell: The Unit of Life
Chapter – 8
| UNIT – (III) CELL: STRUCTURE AND FUNCTION |
| MCQ |
1. Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
Ans: (a) Robert Brown discovered the cell.
2. New cells generate from:
(a) Bacterial fermentation.
(b) Regeneration of old cells.
(c) Pre-existing cells.
(d) Abiotic materials.
Ans: (c) Pre-existing cells.
3. Which among the following is incorrect about the cell wall?
(a) Cell wall provides mechanical support and avoids rupture of cells in a hypotonic solution.
(b) Plasmodesmata are protein granules in the cell wall that provide mechanical support.
(c) Cell wall prevents the cell from invasion and injury.
(d) Cell wall is entirely permeable and rigid.
Ans: (b) Plasmodesmata are protein granules in the cell wall that provide mechanical support.
4. 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 a 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.
Ans: (d) Middle lamella separates cells and is composed of sodium acetate.
5. Which among the following is incorrect about fluid mosaic models?
(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.
Ans: (d) The model fails to explain the cell growth and cell division.
6. Which among the following is incorrect about the structure of plasma membranes?
(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.
Ans: (d) The proteins that are present on the surface of the plasma membrane are called integral proteins.
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.
Ans: (c) Osmosis and diffusion are examples of active transport.
8. Energy for the transport of particles through active mode is derived from ______________.
(a) ATP.
(b) ADP.
(c) Glucose.
(d) Lactic acids.
Ans: (a) ATP.
9. Which among the following is incorrect about the major discoveries in the history of cells?
(a) Robert Brown made the most major contribution to the history of the cell by discovering the 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 the cell in 1665.
Ans: (c) Virchow introduced the concept that genetic material is present inside the nucleus.
10. 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 a prokaryotic cell.
(c) Eukaryotic cells contain membrane-bound organelles.
(d) Prokaryotic cells contain either RNA or DNA.
Ans: (d) Prokaryotic cells contain either RNA or DNA.
11. The cytoplasmic connections from cell to cell are known as
(a) Middle lamella.
(b) Plasmodesmata.
(c) Cell membrane system.
(d) Endoplasmic reticulum.
Ans: (b) Plasmodesmata.
12. Bacterial flagella is made up of
(a) Tubulin.
(b) Flagellin.
(c) Chitin.
(d) None of these.
Ans: (b) Flagellin.
13. Plasmolysis occurs due to-
(a) Absorption.
(b) Endosmosis.
(c) Osmosis.
(d) Exosmosis.
Ans: (d) Exosmosis.
14. The term Cell was given by-
(a) Leeuwenhoek.
(b) Robert hooke.
(c) Flemming.
(d) Robert Brown.
Ans: (b) Robert hooke.
15. Which of the following does not have a cell wall?
(a) Mycoplasma.
(b) Bacteria
(c) PPLO.
(d) Blue green algae.
Ans: (a) Mycoplasma.
