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Transport in Plants Test - 55

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Transport in Plants Test - 55
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  • Question 1
    1 / -0
    Maximum solute pressure occurs in a cell with
    Solution
    Plasmolysis is the process in which cells lose water in a hypertonic solution. Solute pressure is the amount by which water potential is reduced as a result of presence of solute. It is also called as osmotic pressure. A fully turgid cell has minimum solute pressure. Whereas plasmolysed size has maximum solute pressure. During plasmolysis, turgor pressures decreases and hence water comes out of cell. This results in maximum solute pressure in the cell. 
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Xylem walls are
    Solution
    Xylem walls are negatively charged due to carboxyl group present in it. The negative charge is due to galacturonic acid of pectin and glucuronic acid of lignin in the cell wall. It tends to bind to divalent cations like calcium ions.
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    Potential energy of water is
    Solution
    Water potential is the potential energy of water per unit volume. It is the measure of free energy or potential energy of water in a system relative to the free energy of pure water. Water potential is denoted by the Greek letter ψ (psi) are measured in the terms of bars. Water potential can be measured using the formula, ψ = ψs + ψp where ψs = Solute Potential or Osmotic Potential and ψp = Pressure Potential or Turgor Potential. Here, the water movement across the concentration gradient will be higher water potential to lower water potential.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    Which of these is a unit of measurement of water potential/osmotic pressure?
    Solution
    Water potential is denoted by the Greek letter ψ (psi). It is the measure of the relative tendency of water to move from one area to another and are measured in the terms of bars, which is expressed in units of pressure (pressure is a form of energy) called megapascals (MPa). It is the difference between the free energy of water molecules in pure water and solution. Water potential can be measured using the formula, ψ = ψs + ψp where ψs = Solute Potential or Osmotic Potential and ψp = Pressure Potential or Turgor Potential. Here, the water movement across the concentration gradient will be higher water potential to lower water potential.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    Minimum solute potential means
    Solution
    Solute potential is the the ability of a solution to suck in water across a semi-permeable membrane. It is also called as osmotic potential. Minimum solute potential has minimum solute concentration and maximum turgidity. Hence, cell with minimum solute potential will not suck in water.
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    Which of these statements is incorrect.
    Solution
    Water potential is the potential energy of water per unit volume relative to pure water. It occurs due to gravity, mechanical pressure, osmosis etc. The potential of solute concentration is always negative and of pressure is zero.
    So, the correct answer is 'Water potential is equal to solute potential in a fully turgid cell'.
  • Question 7
    1 / -0
    Water potential increases due to
    Solution
    When the amount of solutes increases, osmotic potential decreases, and total water potential decreases, and total water potential decreases. When the pressure increases, water potential increases. 
    So, the correct answer is 'Pressure'.
  • Question 8
    1 / -0
    Which among these one is the most efficient imbibant?
    Solution
    Imbibing are the compounds that imbibe water due to the process of absorption of water in a solid-colloid solution.
    Agar is the most efficient imbibing.
    So, the correct answer is 'Agar'.
  • Question 9
    1 / -0
    Root pressure is higher when;
  • Question 10
    1 / -0
    The physiological process, osmosis can be demonstrated using 
    Solution
    Osmosis is the process of movement of solute from lower concentration to higher concentration through a semi-permeable membrane.
    For the demonstration of osmosis, many experiments are popular including the transfer along the solute gradient.
    So, the correct answer is 'Thistle funnel whose mouth is tied with egg membrane'.
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