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Transport in Plants Test - 52

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Transport in Plants Test - 52
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  • Question 1
    1 / -0
    Radioactive tracer studies with $$^{14}$$C have shown that
    Solution
    The radioactive tracer is a chemical compound used to determine the atoms and molecules by the virtue of radioactive decay. The age of a tree, transportation of solute through phloem etc is seen through the use of radioactive of carbon. 
    So, the correct answer is 'Phloem transports organic nutrients'.
  • Question 2
    1 / -0
    The term water potential was coined by 
    Solution
    Water potential is the measure of the relative tendency of water to move inside or outside the cell.
    This term was first coined by Slatyer and Taylor in the year 1818.
    So, the correct answer is 'Slatyer and Taylor'.
  • Question 3
    1 / -0
    A leafy twig of mesophytic plant dipped in water would demonstrate 
    Solution
    Mesophytic plants are the plants which grow in the areas/lands which is not too dry not too wet.
    When this type of plant is dipped in water (making hydrophytic) then it will demonstrate transpiration More will be the amount of water and more will be the transpiration rate.
    Biochemical processes like photosynthesis, respiration and guttation do not depend upon the nature of land but transpiration depends upon the amount of water present in the soil.
    So, the correct answer is 'Transpiration'.
  • Question 4
    1 / -0
    Food is transported to different parts of plant through
    Solution
    In plant transport system no heart, no blood, and no other circulatory system, but plants do need a transport system to move food, water, and minerals around. They use two different systems then xylem moves water and solutes from the roots to the leaves and phloem moves food substances from leaves to the rest of the plant, then phloem is the transporting system of food to the plants.
    So, the correct option is B.
  • Question 5
    1 / -0
    "Osmosis is flow of solution from higher concentration to a solution of lower concentration through a semi-permeable membrane." Which one of the following statements is incorrect?
    Solution
    Osmosis occurs only through the semi-permeable membrane. Osmosis is a gradient dependent process, osmosis is different from diffusion as it is characterized by a semi-permeable membrane.
    So, the correct answer is 'Osmosis cannot occur through an impermeable membrane'.
  • Question 6
    1 / -0
    Potato slices were placed in sucrose solution. After half an hour, density of sucrose solution increased. Water potential of Potato tuber is 
    Solution
    Water moves from high potential to lower potential. Sucrose solution has a higher potential potato slice has lower potential so the solution moves from higher concentration into low concentration due to this reason the concentration of water in the solution decreases and so solution becomes more concentrated since the mass of solute per unit volume increases so the density of solution increases.
    So, the answer is 'less than the solute potential of sucrose solution'.
  • Question 7
    1 / -0
    Cells absorb water through 
    Solution
    Cells absorb water through osmosis and imbibition. Both the phenomena help in the metabolic activity of the plant. 
    The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition. During germination, imbibition plays an important role. Water enters inside the seed by the process of imbibition. Water allows the seed to swell which breaks the seed coat and the seed germinate. Factors like temperature, oxygen etc. are required for germination.
    Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. The cells absorb water by the process of endosmosis from its surrounding and water exits by the process of exosmosis. On absorption of water the turgor pressure inside the cells increases. It helps to maintain the shape of the cell. It helps in the growth, development, mechanical support and prevents wilting.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    Most widely accepted theory of carbohydrate translocation is
    Solution
    (A) Mass flow theory proposes the transportation of food in the plants.
    (B) Root pressure theory proposes the transportation of water in the plants through the root pressure.
    (C) Imbibition theory proposes water transportation through pipes.
    (D) Transpiration theory proposes water transportation due to the evaporation from the upper surface of the leaves.
    So, the correct answer is 'Mass flow theory'.
  • Question 9
    1 / -0
    Shrinking of protoplasm from cell wall under influence of hypertonic solution is 
    Solution
    Plasmolysis is the shrinking of the protoplasm as a result of water loss from osmosis when a cell comes in contact with a hypertonic solution. Plant cells kept in hypertonic solution will start losing water by the process of exosmosis as there is lesser concentration of solvent molecules than the fluid inside the cell so the solvent molecules are forced outside the cell from the region of higher concentration to the lower concentration. The cell turns flaccid. On further loss of water, the protoplasm shrinks and moves away from the cell wall and the cell gets plasmolysed.
    So, the correct answer is option A.
  • Question 10
    1 / -0
    Wooden doors swell up and get stuck during rainy season due to 
    Solution
    Swelling of wooden doors during rains is caused by the process of imbibition. The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition. The water potential gradient between the absorbent (wooden frame) and the liquid imbibed (water) is essential for imbibition.
    So, the correct answer is option B.
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