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Cell: The Unit of Life Class 11 MCQs Questions with Answers
Solving the Cell: The Unit of Life Multiple Choice Questions of Class 11 Biology Chapter 8 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Cell: The Unit of Life Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 8 Biology Class 11 and cross-check your answers during preparation.
I. Select the correct answer from the following questions:
Question 1.
Ribosomes were discovered by
(a) Golgi
(b) Porter
(c) Robertis
(d) Palade
Answer
Answer: (d) Palade.
Question 2.
In which component of a mitochondrion ATP is synthesied?
(a) Matrix
(b) outer membrane
(c) crista
(d) F0-F1 complex (Oxysome)
Answer
Answer: (d) F0-F1 complex (Oxysome)
Question 3.
Tonoplast, a differentially permeable membrane, surround the
(a) nucleus
(b) Cytoplasm
(c) Lysosomes
(d) Vacuole
Answer
Answer: (d) Vacuole.
Question 4.
Addition of the new cell wall material in the existing one is
(a) Deposition
(b) Aggregation
(c) Intussusception
(d) apposition
Answer
Answer: (c) Intussusception.
Question 5.
The interphase nucleus is enclosed in
(a) a porous double membrane
(b) a non-porous single membrane
(c) a porous double membrane
(d) many membranes
Answer
Answer: (c) A porous double membrane.
Question 6.
The chloroplast thylakoids are in the form of
(a) interconnected sacs
(b) independent discs
(c) interconnected tabules
(d) stalked discs.
Answer
Answer: (a) Interconnected sacs.
Question 7.
Aerobic respiration is performed by
(a) glyoxisome
(b) lysosomes
(c) mitochondria
(d) stalked discs.
Answer
Answer: (c) Mitochondria.
Question 8.
Plant cell differ from animal cell in having
(a) mitochondria
(b) cell wall
(c) golgi bodies
(d) ribosomes
Answer
Answer: (b) Cell wall
Question 9.
The cell wall of certain fungi is made of
(a) lignin
(b) pectin
(c) suberin
(d) chitin
Answer
Answer: (d) Chitin
Question 10.
Desmosomes are connected with
(a) cytolysis
(b) cell division
(c) cell excretion
(d) cell adherence.
Answer
Answer: (d) Cell adherence.
Question 11.
Fluid mosaic model of cell membrane state that it has lipid bilayer with
(a) proteins on the outer surface only.
(b) Some proteins embedded and some on the surface.
(c) Proteins on both the surfaces.
(d) Proteins embedded and some on the surface.
Answer
Answer: (b) Some proteins embedded and some on the surface.
Question 12.
Fluid mosaic model of cell membrane was proposed by
(a) Singer and Nicholson
(b) waston and crick
(c) Robertson
(d) danielli and davson
Answer
Answer: (c) Robertson.
Question 13.
Ribosomes are centres
(a) Photosynthesis
(b) liquid synthesis
(c) Respiration
(d) protein synthesis
Answer
Answer: (d) Protein synthesis.
Question 14.
A membrahe covering
(a) Mitochondrion
(b) nucleolus
(c) Plastid
(d) Lysosome
Answer
Answer: (b) Nucleolus.
Question 15.
Solar energy is converted into ATP/chemical energy by
(a) Chloroplast
(b) Ribosome
(c) Mitochondria
(d) Peroxisome
Answer
Answer: (a) Chloroplast.
Question 16.
The organelle regarded a sugar factory in an autotrophic eukaryotic cell is
(a) Mitochondrion
(b) Ribosome
(c) Chloroplast
(d) Endoplasmic reticulum.
Answer
Answer: (c) Chloroplast.
Question 17.
Cell wall shows
(a) Permeability
(b) Semi permeability
(c) Impermeability
(d) Differential permeability
Answer
Answer: (a) Permeability
Question 18.
Golgi apparatus is lacking in
(a) Higher plants
(b) yeasts
(c) Liver cells
(d) Blue green algae.
Answer
Answer: (d) Blue green algae.
Question 19.
Outer and inner membranes of mitochondria are
(a) structurally and functionally different
(b) stucturally different but functionally similar
(c) structurally and functionally similar
(d) structurally similar but functionally different
Answer
Answer: (a) Structurally and functionally different
Question 20.
Smallest unit in cell wall is
(a) Middle lamella
(b) Microfibil
(c) Micelle
(d) Fibril
Answer
Answer: (c) Micelle.
Question 21.
Mitochondria are absent in
(a) Green algae
(b) Brown algae
(c) Red algae
(d) Bacteria
Answer
Answer: (d) Bacteria
Question 22.
Polymorphic cell organelle is
(a) Golgi complex
(b) lysosome
(c) Glyoxysome
(d) peroxisome
Answer
Answer: (b) Lysosome.
Question 23.
Organelle covered
(a) Glyoxysome
(b) lysosome
(c) Glyoxysome
(d) All of these
Answer
Answer: (d) All of these.
Question 24.
Lysosome contain
(a) Carbohydrates
(b) nucleic acids
(c) Hydrolases
(d) Hormones
Answer
Answer: (c) Hydrolases.
Question 25.
Which cell organelle reduces the number of other organelles?
(a) Mitochondria
(b) Lysosome
(c) Oxysome
(d) None of these
Answer
Answer: (b) Lysosome.
Question 26.
The plant cell wall possesses
(a) Hemicellulose
(b) Cellusose
(c) Pectin
(d) All of these
Answer
Answer: (d) All of these.
II. Fill in the blanks:
Question 1.
All organisms are composed of ………….. Some are composed of a single cell and called …………… organisms while others, like us, are composed of many cells and called …………… organisms.
Answer
Answer: cells, unicellular, multicellular
Question 2.
The study of structure, composition, functions and life processes of the cell is called ……………
Answer
Answer: cell biology
Question 3.
……………… was the first person to describe the cell in 1865 when he used a microscope built by him to examine a thin slice of cork
Answer
Answer: Robert Hooke
Question 4.
In 1831, …………….. made on important discovery when he reporeted the presence of a small sphere in the cells of the orchid root
Answer
Answer: Robert Brown
Question 5.
………….. and ………….. combined their views and formulated the cell theory
Answer
Answer: Schleiden, Schwann
Question 6.
The presence of several types of organ systems in the body of multicellular organism is a unique example of …………….
Answer
Answer: division of labour
Question 7.
Since most of the activities of an organism are present in miniature form in each and every cell, the cell can be called a ………………..
Answer
Answer: functional unit of life
Question 8.
Every cell has its own .life span Old and weak cells die and are replaced by new ones which are formed by the ………….. of the younger cells
Answer
Answer: division
Question 9.
In general, cells can be divided into two main types (a) ……………. (b) ……………
Answer
Answer: prokaryotic, eukaryotic cells
Question 10.
The prokaryotic cells are represented by the bacteria, blue-green algae, mycoplasma or PPLO (pleuro pneumonia like organisms) ………….. and ……………
Answer
Answer: spirochete, rickettsiae
Question 11.
The bacteria can be classifed into two groups on the basis of the differences in the cell envelopes viz the …………. and …………..
Answer
Answer: Gram positive, Gram negative
Question 12.
One such structure is the mesosome which is formed by the extensions of plasma membrane into the cell in the ……………, ………….. and ………….
Answer
Answer: form of vescicies, tubules, lamellae
Question 13.
Several ribosomes may attach to a single m RNA and form a chain called ………….. or …………
Answer
Answer: polyribosomes, polysome.
Question 14.
Bacterial flagellum is composed of three parts- …………, ………… and …………
Answer
Answer: filament, hook, basal body
Question 15.
In fact, the plant cells possess a conspicuous thick layer of cellilose covering the cell membrane called the …………..
Answer
Answer: cell wall
III. Mark the statements True (T) or False (F)
Question 1.
Sometimes a few chromosomes have secondary constrictions at a constant location, which are their non-staining region and give the appearance of a small fragment called the satellite.
Answer
Answer: True
Question 2.
Every chromosome essentially has a primary constriction or the centromere on the sides of which disc shaped structures called kine- tochore, for the attachment of the spindle fibres, is also present.
Answer
Answer: True
Question 3.
The biochemical analysis of the isolated chromatin has revealed that it contains DNA, some basic protein called histones, some nonhistone proteins and also RNA.
Answer
Answer: True
Question 4.
The electron microscope has revealed that the nuclear envelope, which consists of two parallel membranes spaced by 10 to 50nm called the perinuclear space.
Answer
Answer: True
Question 5.
The eukaryotic cells usually possess a large sized, almost centrally located and densely stained organelle containing the genetic material called nucleus.
Answer
Answer: True
Question 6.
The central part of the centriole is also proteinaceous called the hub, which is connected with a tubules of the peripheral tripets by radial spokes made up of protein.
Answer
Answer: True
Question 7.
The electron microscopic studies of the cross section of a cilium or the flagellum shows that it it covered with plasma membrane and its core called the axoneme possesses a number of microtubules running parallel to the long axis of the organelle.
Answer
Answer: True
Question 8.
Cilia and flagella are the hair-like microtubular organelle projected in the form of an out growth of the cell membrane used either for the movement of the cell or the movement of the surrounding* fluid.
Answer
Answer: True
Question 9.
Inside the space lined by the inner membrane of the chloroplast, called the ribosomes a number of organized flattened membranous sacs are present called the cytoskeleton.
Answer
Answer: False
Question 10.
Based on the type of pigments present in them plastids can be classified into chloroplasts, chromoplasts and leucoplasts.
Answer
Answer: True
Question 11.
Vacuoles also exert a hydrostatic pressure called the vacuole pressure that gives the mechanical support to the cell.
Answer
Answer: False
Question 12.
The primary wall consists of a very fine network of the microfibrils made up of cellulose and pectic polysachharides embedded in the gellike matrix.
Answer
Answer: True
Question 13.
Many cells exhibit the rough surface endoplasmic reticulum, whereas such granular structures are not present in many of them in the smooth endoplasmic reticulum (SER).
Answer
Answer: True
IV. Match the column I with column II.
| Column I | Column II |
| (a) All organisms are composed | 1. Two dutch scientist E. Gorter and F. Grendel in 1925. |
| (b) Robert Hooke was the first person to | 2. extracted lipid would cover the surface of water. |
| (c) Cell theory | 3. of cell. |
| (d) The presence of several types of organ systems in the body of multicellular organims is | 4. describe the cell in 1965 when he used a microscope built by him to examine a thin slice of cork. |
| (e) The initial evidence that the cell membrane contains lipid came after the study of | 5. and muscle contraction by release and up take of Ca2+ |
| (f) After the extraction of lipid from human RBCs they measured surface area the | 6. a unique example of division of labour. |
| (g) Mitochondria typically it appears as sausage shaped or cylindrical with 0.2-1.0/xm (average 0.5 Jim) | 7. in its diameter and 1.0-4. 1 pm in length. |
| (h) In human beings the eryth-rocyte’s membrane has approxi-mately 52% protein. | 8. Present all along the length and breadth in almost all the eukary-otic cells consisting mainly of the tubulion protein. |
| (i) Microtubules are the hollow, cylindrical and stiff structure of approximately 25nm diameter | 9. and 40% of lipid whereas the myelinated neuron has approxi-mately 20% of protein and 80% of lipid. |
| (j) Microfilaments are solid and cylindrical structure of 8-1 Onm diameters made up of | 10. other cytaskeletal filaments. |
| (k) Intermediate filament are solid and unbranched filamentous structure often interconnected to the | 11. the helical polymer of atin protein. |
| (l) Based on the type of pigments present in them plastids can be classified into | 12. Chloroplasts, chromoplasts and leucoplasts. |
| (m) The central part of the centriole is also | 13. proteinaceous called the hub. |
| (n) The biochemical analysis of the isolated chromatin has reve-aled that it contains DNA, | 14. some basic protein called histones, some non-histone protains and also RNA. |
| (o) The other important roles SER play in the cell is detoxi fication of a variety of organic compounds | 15. (i) All living arganisms are composed of cells and products of cells. (ii) All cells arise from pre-existing cells. |
Answer
Answer:
| Column I | Column II |
| (a) All organisms are composed | 3. of cell. |
| (b) Robert Hooke was the first person to | 4. describe the cell in 1965 when he used a microscope built by him to examine a thin slice of cork. |
| (c) Cell theory | 15. (i) All living arganisms are composed of cells and products of cells. (ii) All cells arise from pre-existing cells. |
| (d) The presence of several types of organ systems in the body of multicellular organims is | 6. a unique example of division of labour. |
| (e) The initial evidence that the cell membrane contains lipid came after the study of | 1. Two dutch scientist E. Gorter and F. Grendel in 1925. |
| (f) After the extraction of lipid from human RBCs they measured surface area the | 2. extracted lipid would cover the surface of water. |
| (g) Mitochondria typically it appears as sausage shaped or cylindrical with 0.2-1.0/xm (average 0.5 Jim) | 7. in its diameter and 1.0-4. 1 pm in length. |
| (h) In human beings the eryth-rocyte’s membrane has approxi-mately 52% protein. | 9. and 40% of lipid whereas the myelinated neuron has approxi-mately 20% of protein and 80% of lipid. |
| (i) Microtubules are the hollow, cylindrical and stiff structure of approximately 25nm diameter | 8. Present all along the length and breadth in almost all the eukary-otic cells consisting mainly of the tubulion protein. |
| (j) Microfilaments are solid and cylindrical structure of 8-1 Onm diameters made up of | 11. the helical polymer of atin protein. |
| (k) Intermediate filament are solid and unbranched filamentous structure often interconnected to the | 10. other cytaskeletal filaments. |
| (l) Based on the type of pigments present in them plastids can be classified into | 12. Chloroplasts, chromoplasts and leucoplasts. |
| (m) The central part of the centriole is also | 13. proteinaceous called the hub. |
| (n) The biochemical analysis of the isolated chromatin has reve-aled that it contains DNA, | 14. some basic protein called histones, some non-histone protains and also RNA. |
| (o) The other important roles SER play in the cell is detoxi fication of a variety of organic compounds | 5. and muscle contraction by release and up take of Ca2+ |
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