Chapter 5: The Fundamental Unit of Life - Q/A
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Questions and Answers

Who discovered cells and how?

  • Anton van Leeuwenhoek, by observing onion cells under a microscope
  • Louis Pasteur, by studying the structure of bacteria under a microscope
  • Gregor Mendel, through genetic experiments on pea plants
  • Robert Hooke, by using a primitive microscope to observe cells in a cork slice (correct)

    • Why are cells called the structural and functional unit of life?

  • Due to their role as building blocks of life and their capability of all living functions (correct)
  • Because they are the smallest units of life and constitute various components of plants and animals
  • Because they vary in shape, size, and activity they perform
  • As a result of their specific functions related to the shape and size of the cell

    • How does the exchange of gases (CO2 and O2) between cells take place?

  • Active transport process from lower concentration to higher concentration
  • Diffusion process from higher concentration to lower concentration (correct)
  • Osmosis process from higher concentration to lower concentration
  • Facilitated diffusion from lower concentration to higher concentration

    • What is the reason for the accumulation of CO2 inside the cell?

    <p>It is formed inside the cell due to respiration</p> Signup and view all the answers

    Why does the concentration of O2 decrease inside the cell during respiration?

    <p>It is utilized inside the cell during respiration</p> Signup and view all the answers

    What defines cells as the building blocks of life?

    <p>Their ability to constitute various components of plants and animals</p> Signup and view all the answers

    What is the process in which water moves from a region of high concentration to a region of low concentration through the plasma membrane called?

    <p>Osmosis</p> Signup and view all the answers

    Why is the plasma membrane known as a selectively permeable membrane?

    <p>It regulates the movement of substances in and out of the cell</p> Signup and view all the answers

    Which organelles contain their own genetic material?

    <p>Mitochondria and plastids</p> Signup and view all the answers

    What is the smallest unit of life capable of all living functions?

    <p>Cell</p> Signup and view all the answers

    Why are lysosomes sometimes referred to as 'suicide bags'?

    <p>They release digestive enzymes within the cell, causing self-destruction</p> Signup and view all the answers

    Where are proteins synthesized inside the cell?

    <p>Ribosomes</p> Signup and view all the answers

    What do we call the movement of water from a region of high concentration to a region of low concentration?

    <p>Osmosis</p> Signup and view all the answers

    What happens if the organization of a cell is destroyed due to some physical or chemical influence?

    <p>The ability of the cell to perform all living functions will be affected</p> Signup and view all the answers

    What is movement of water through a selectively permeable membrane known as?

    <p>Osmosis</p> Signup and view all the answers

    What are the two organelles that contain their own genetic material?

    <p>Mitochondria and plastids</p> Signup and view all the answers

    What is a triangle?

    <p>A closed figure formed by three intersecting lines</p> Signup and view all the answers

    What does 'congruent' mean?

    <p>Equal in all respects or figures whose shapes and sizes are both the same</p> Signup and view all the answers

    How many sides does a triangle have?

    <p>Three</p> Signup and view all the answers

    In triangle ABC, what do AB, BC, and CA represent?

    <p>Three sides</p> Signup and view all the answers

    What will you study in detail in this chapter?

    <p>Congruence of triangles, rules of congruence, properties of triangles, and inequalities in a triangle</p> Signup and view all the answers

    What does the prefix 'tri-' mean?

    <p>Three</p> Signup and view all the answers

    What is the condition for two triangles to be congruent?

    <p>Having the same sides and angles</p> Signup and view all the answers

    Why is the concept of congruence used in making casts for ice trays?

    <p>To produce identical objects</p> Signup and view all the answers

    What is the significance of congruent refills for a pen?

    <p>They allow easy replacement</p> Signup and view all the answers

    What do we observe when two circles of the same radius are placed on each other?

    <p>They cover each other completely</p> Signup and view all the answers

    Why are the large squares in Fig. 7.3 (ii) and (iii) not congruent to the square in Fig 7.3 (i)?

    <p>They have different side lengths</p> Signup and view all the answers

    In what condition do two equilateral triangles become congruent to each other?

    <p>Having equal sides</p> Signup and view all the answers

    Why might it be difficult to replace a refill in a pen by a new one?

    <p>The new refill is not of the same size</p> Signup and view all the answers

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