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Transport in Plants Test - 59

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Transport in Plants Test - 59
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  • Question 1
    1 / -0
    Water potential of pure water and its solution are
    Solution
    Water potential of pure water is zero because there is no solute present as well as the pressure in the system is zero.
    When a solute is dissolved it significantly decreases the water potential making the solute potential negative in value. So the value of water potential becomes negative.
    So the correct answer is '0 and less than zero'.
  • Question 2
    1 / -0
    Osmotic pressure of pure water is 
    Solution
    Osmotic pressure of pure water is 0 atm as no pressure is present over the system. On addition of solute osmotic pressure increases.
    So the correct answer is ' 0 atm'.
  • Question 3
    1 / -0
    A column of water within xylem vessels of tall trees does not break under its weight because of 
    Solution
    Correct Option: B
    Explanation: 
    • There are various forces responsible for the movement of water like cohesion, adhesion, and surface tension.
    • Cohesion or tensile strength is the mutual force of attraction between water molecules. 
    • This happens due to the hydrogen bonds formed between water molecules.
    • Hence, a column of water within the xylem vessels of tall trees does not break under its weight because of the tensile strength of water. 
  • Question 4
    1 / -0
    End walls of tracheids and Vessels respectively are
    Solution
    Tracheids and vessels both have pits but vessels have an opening which connects single individual vessel elements to form a single tube. These end openings are called perforation plates. Tracheids are imperforate, have pit pairs on common walls.
    So, the correct answer is 'Pitted and perforated'
  • Question 5
    1 / -0
    Which of the following statement is true?
    Solution
    Vessels are multicellular with wide lumen. They are made up of vessel  elements lying one above the other. The wall of vessels is hard but not thick having wide lumen. Whereas tracheids are unicellular with narrow lumen. 
    Thus, the correct answer is 'Vessels are multicellular with wide lumen'.
  • Question 6
    1 / -0
    Active transport of ions through cell membranes is brought about by.
  • Question 7
    1 / -0
    Active transport of solutes in a living system is?
  • Question 8
    1 / -0
    Transpiration efficiency refers to.
    Solution
    Answer is option C i.e. "Weight of dry matter produced per kg of water transpired"
    Transpiration efficiency is an important plant characteristic. Transpiration efficiency is defined as the total dry matter produced per unit of water transpired.  Improvement of transpiration efficiency means maximizing crop production per unit of water used.
  • Question 9
    1 / -0
    Although a gridled (upto bast) tree may survive for sometime, but it will eventually die because _________________.
  • Question 10
    1 / -0
    Translocation of organic materials is best explained by
    Solution
    Mass flow theory is also known as pressure flow hypothesis was given by Munch. It explains the movement of sap through the phloem. It is known as translocation. The glucose is produced by photosynthesis in the mesophyll cells of green leaves. It is actively transported to the companion cells and increases the sugar concentration which draws water from nearby cells xylem cells and creates hydrostatic pressure and pushes the sugar towards the sink. The low sugar content in the companion cells again releases the water to nearby xylem cells.
    So, the correct answer is option D.

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