9th Class Science The Fundamental Unit of Life Question Bank

done Case Based MCQs - The Fundamental Unit of Life Total Questions - 30

• question_answer1)

  Direction: Q. 1 to 5

  Read the following and answer the questions from [1] to [5].

  The body of all organisms are made up of tiny microscopic units called cell. All basic functions of the body like respiration, excretion are carried out by cell. The shape and size of cells are related to the specific function they perform; Some cells like Amoeba have changing shapes.

  In some cases, the cell shape could be more or less fixed and peculiar for particular type of cell; for example, nerve, cells have a typical shape.

  Each living cell has the capacity to perform certain basic functions that are characteristic of all living forms. There is a division of labour in multicellular organisms such as human beings. 'This means that different parts of the human body perform different functions.

  The human body has a heart to pump blood, a stomach to digest food and so on. Similarly, division of labour is also seen within a single cell.

  In fact, each such cell has got certain specific components within it known as cell organelles. Each kind of cell organelle performs a special function, such as making new material in the cell, clearing up the waste material from the cell and so on.

  A cell is able to live and perform all its functions because of these organelles. These organelles together constitute the basic unit called the cell.

  Thus, the cell is the fundamental structural unit of living organisms. It is also the basis functional unit of life.

   The first cell was observed in
  A)
  bread slice done clear
  B)
  onion peel done clear
  C)
  cork slice done clear
  D)
  cheek cells done clear
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• question_answer2)
  Animal cell lacking nuclei would also lack in
  A)
  ribosomes                                  done clear
  B)
  lysosomes done clear
  C)
  endoplasmic reticulum done clear
  D)
  chromosomes done clear
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• question_answer3)
  Which of the following statement is correct?
  A)
  Prokaryotic cells are surrounded by a cell membrane done clear
  B)
  Prokaryotic cells have a nucleus and cell organelles done clear
  C)
  Eukaryotic cells have membrane bound organelles done clear
  D)
  Eukaryotic cells are associated with nucleoid. done clear
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• question_answer4)
  A cell that has large central vacuole is
  A)
  plant cell         done clear
  B)
  animal cell done clear
  C)
  bacterial cell      done clear
  D)
  yeast cell done clear
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• question_answer5)
  In a cell, DNA is found in
  A)
  nucleus, mitochondria and plastids done clear
  B)
  nucleus, mitochondria and vacuoles done clear
  C)
  plastids, nucleus and Golgi bodies done clear
  D)
  mitochondria, Golgi bodies and lysosomes done clear
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• question_answer6)

  Direction: Q. 6 to 10

  Read the following and answer the questions from [6] to [10].

  Every cell has a membrane around it to keep its own contents separate from the external environment. Large and complex cells, including cells from multicellular organisms, need a lot of chemical activities to support their complicated structure and function.

  To keep these activities of different kinds separate from each other, these cells use membrane bound little structures (or organelles) within themselves. This is one of the features of the eukaryotic cells that distinguish them from prokaryotic cells.

  In prokaryotes, beside the absence of a defined nuclear region, the membrane bound organelles are also absent.

  On the other hand, the eukaryotes cells have nuclear membrane as well as membrane-enclosed organelles.

  Ribosomes are the centre for
  A)
  respiration                                  done clear
  B)
  protein synthesis done clear
  C)
  photosynthesis done clear
  D)
  fat synthesis done clear
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• question_answer7)
  Double membrane is absent in
  A)
  mitochondria                              done clear
  B)
  chloroplast done clear
  C)
  nucleus                                      done clear
  D)
  lysosomes done clear
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• question_answer8)
  Which of the following is responsible for the mechanical support, protein synthesis and transport of material?
  A)
  Cell membrane done clear
  B)
  Ribosomes done clear
  C)
  Endoplasmic reticulum                 done clear
  D)
  Golgi apparatus done clear
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• question_answer9)
  Which of the following is not a membrane bound organelle?
  A)
  Ribosomes                                 done clear
  B)
  Lysosomes done clear
  C)
  ER                                            done clear
  D)
  Nucleus done clear
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• question_answer10)
  Which is the largest cell organelle present in plant cell?
  A)
  Nucleus                                     done clear
  B)
  Chloroplast done clear
  C)
  Endoplasmic reticulum done clear
  D)
  Mitochondria done clear
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• question_answer11)

  Direction: Q. 11 to 15

  Read the following and answer the questions from [11] to [15].

  Every cell has atleast three features, i.e. plasma membrane, nucleus and cytoplasm.

  All the activities inside the cell and interactions of the cell with its environment are possible due to these features.

  Plasma membrane is the outermost covering of the cell that separates the contents of the cell from its external environment. It allows entry and exit of some materials in and out of the cell.

  The nucleus is the dense and spherical organelle. It plays a central role in cellular reproduction. It controls all the metabolic activities of the cell.

  The cytoplasm is a jelly-like, colourless semi-fluid substance inside plasma membrane. It contains specialised cell organelles.

  If we observe any cell under the microscope, starting from outer side, the correct sequence of structure we observe is
  A)
  nucleus, cell membrane, cytoplasm done clear
  B)
  cell membrane, cytoplasm, nucleus done clear
  C)
  cytoplasm, nucleus, cell membrane done clear
  D)
  nucleus, cytoplasm, cell membrane done clear
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• question_answer12)
  The process by which water moves through a semipermeable membrane from a region of high concentration to a region of lower concentration is called
  A)
  diffusion         done clear
  B)
  osmosis done clear
  C)
  evaporation      done clear
  D)
  All of these done clear
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• question_answer13)
  The cell theory, jointly given by Schleiden and Schwann did not explain
  A)
  all living organism are composed of cells and their products done clear
  B)
  cell is the structural and function unit of living organisms. done clear
  C)
  Formation of new cells done clear
  D)
  None of the above done clear
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• question_answer14)
  The plasma membrane is made up of
  A)
  lipids                                         done clear
  B)
  vitamins done clear
  C)
  minerals                                     done clear
  D)
  carbohydrates done clear
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• question_answer15)
  Rod - shaped structure present in nucleus called
  A)
  DNA            done clear
  B)
  vacuole done clear
  C)
  genes                                         done clear
  D)
  chromosomes done clear
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• question_answer16)

  Direction: Q. 16 to 20

  Read the following and answer the questions from [16] to [20].

  Nucleus is the prominent, organelle present in cell which is the controlling centre of all activities of the cell. It is covered by nuclear membrane.

  The nuclear membrane allow the transfer of material from inside the nucleus to its outside, that is, to the cytoplasm. There are chromosomes, rod shaped structures present in the nucleus which contain genetic information.

  The nucleus plays a central role in cellular reproduction, the process by which a single cell divides and forms two new cells. It also plays a crucial part, along with the environment, in determining the way the cell will develop and what form it will exhibit at maturity, by directing the chemical activities of the cell.

  It helps in the transmission of characters from one generation to the next. If the nucleus is removed from the cell, the protoplasm ultimately dries up and dries.

  Chromosomes are composed of
  A)
  acids and bases done clear
  B)
  mineral and bases done clear
  C)
  DNA and proteins done clear
  D)
  DNA and RNA done clear
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• question_answer17)
  The nucleus is separated from surrounding cytoplasm by a nuclear membrane, which is
  A)
  single-layered with pores done clear
  B)
  double-layered with pores done clear
  C)
  double-layered without pores done clear
  D)
  single-layered without pores done clear
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• question_answer18)
  Which is true about genetic material of a prokaryotic cells?
  A)
  It contains only nucleic acids done clear
  B)
  It has poorly defined regions done clear
  C)
  Not enveloped by nuclear membrane done clear
  D)
  AII of the above done clear
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• question_answer19)
  When the cell is about to divide, the chromatin material gets organised into
  A)
  DNA            done clear
  B)
  nucleoid done clear
  C)
  genes                                         done clear
  D)
  chromosomes done clear
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• question_answer20)
  The chloroplast in photosynthetic prokaryotic bacteria is associated with
  A)
  vesicles         done clear
  B)
  nucleus done clear
  C)
  plastids         done clear
  D)
  vacuoles done clear
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• question_answer21)

  Direction: Q. 21 to 25

  Read the following and answer the questions from [21] to [25].

  All the living organisms are made up of cells. It is a fundamental, structure and functional unit of life. The given diagram shows the plant cell.

  On the basis of given diagram, answer the following question

  Which of the following differentiate plant cells from animal cell?
  A)
  Large vacuoles, plastid and cell wall done clear
  B)
  Cell wall, plastid and centriole done clear
  C)
  Cell wall, plastid and mitochondria done clear
  D)
  Cell membrane, plastids and cell wall done clear
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• question_answer22)
  Chloroplasts found in plant cells
  A)
  are colourless plastids done clear
  B)
  do not contained DNA done clear
  C)
  are involved in storing of starch, oils and proteins done clear
  D)
  contain various yellow or orange pigments done clear
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• question_answer23)
  Choose the incorrect pair
  A)
  Chloroplast-traps light energy done clear
  B)
  Leucoplast-stores nutrients done clear
  C)
  Chromoplasts-imparts colours to the plant done clear
  D)
  None of the above done clear
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• question_answer24)
  The central vacuole of some plant cells may occupy ........ of the cell volume.
  A)
  50-90%         done clear
  B)
  60-170% done clear
  C)
  30-40%          done clear
  D)
  1-2% done clear
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• question_answer25)
  In plant cells, vacuoles are involved in
  A)
  storage of substances done clear
  B)
  transport of substances done clear
  C)
  expelling excess water done clear
  D)
  expelling waste done clear
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• question_answer26)

  Direction: Q. 26 to 30

  Read the following and answer the questions from [26] to [30].

  Endoplasmic reticulum is a large network of membrane bound tubes and sheets. It extends from outer nuclear membrane into the cytoplasm. It looks like long tubules round and oblong bags (vesicles). It occurs in three forms, i.e. cisternae, vesicles and tubules. ER is of two types, i.e. Rough Endoplasmic Reticulum (RER) and Smooth

  Endoplasmic Reticulum (SER). ER is absent in prokaryotic cell, and matured RBCs of mammals.

  It varies greatly in appearance in different cells, it always forms a network system. It serves as channel for the transport of materials between various regions of the cytoplasm or between the cytoplasm and the nucleus.

  It also functions as a cytoplasmic framework providing a surface for some of the biochemical activities of the cell.

  Endoplasmic reticulum has two types on the basis of
  A)
  nature of its membrane done clear
  B)
  shape of its membrane done clear
  C)
  function of its membrane done clear
  D)
  All of the above done clear
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• question_answer27)
  Rough endoplasmic reticulum looks rough under a microcope due to the presence of
  A)
  mitochondria                              done clear
  B)
  ribosomes done clear
  C)
  nucleus                                      done clear
  D)
  Golgi apparatus done clear
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• question_answer28)
  SER plays a role in detoxifying many poisons and drugs in
  A)
  stomach cells    done clear
  B)
  pancreas cells done clear
  C)
  liver cells        done clear
  D)
  brain cells done clear
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• question_answer29)
  The endoplasmic reticulum membrane is similar in the structure to the
  A)
  nuclear membrane done clear
  B)
  plasma membrane done clear
  C)
  mitochondira membrane done clear
  D)
  plastids membrane done clear
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• question_answer30)
  The proteins and lipids, essential for building the cell membrane, are manufactured by
  A)
  endoplasmic reticutum done clear
  B)
  nucleus done clear
  C)
  mitochondria done clear
  D)
  plasma membrane done clear
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