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Transport in Plants Test - 68

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Transport in Plants Test - 68
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Choose correct statement.
    Solution
    Nitrogen (N) is quantitatively the most important nutrient for plant growth and productivity. Uptake of inorganic or organic N from the soil, and transport of newly synthesized organic N from so-called source organs (e.g. leaves and roots) to sinks (developing leaves, flowers and seeds) are integral to the physiology of plants and essential for plant development. In addition, reallocation of N stored as protein reserves is important during leaf senescence, seed germination, spring growth of perennials and development of new generations from tubers and other reproductive propagules. Nitrogen assimilation in plants. Plants absorb nitrogen from the soil in the form of nitrate ($$NO_{3}^-$$) and ammonium ($$NH_4^+$$). In aerobic soils where nitrification can occur, nitrate is usually the predominant form of available nitrogen that is absorbed.
    So the correct option is 'nitrogen is transported in plant xylem is organic form'.
  • Question 2
    1 / -0
    Which force arises between the water molecules of leaves due to transpiration?
    Solution

    A.Cohesive force – force of attraction present between the water molecules is called cohesive force. Due to this, water column maintains tensile strength.

    B.Pressure force – force developed to accumulation of pressure.

    C.Suction force – force exists in the sucking of water.

    D.Adhesive force – force of attraction exists between the water molecules and walls of the vessels is called adhesive force. Due to this, capillarity exists in the water column.

    So, the correct option is ‘cohesive force’.
  • Question 3
    1 / -0
    What happens when wilted vegetable are dipped in water
    Solution

    When wilted vegetables are dipped in water they regain their size due to the process of osmosis which explain the flow of solvent from higher concentration to lower concentration.
    So the correct option is ' They regain their size'.

  • Question 4
    1 / -0
    Which condition will not favour guttation?
  • Question 5
    1 / -0
    Transpiration is least in?
    Solution

    Loss of water in the form of water vapour through the aerial parts of the plant body is called Transpiration. The transpiration rate falls as the relative humidity of the air around the plant increases.
    So, the correct option is 'High atmosphere Humidity'.
  • Question 6
    1 / -0
    Root pressure is caused by
    Solution
    Root pressure is caused in the Xylem vessels due to osmosis. It is a positive pressure which is developed due to Osmotic pressure which is high in the root as compared to the water column above.
    Diffusion is a very slow process and hence plant do not just depend on it for the ascent of sap.
    Since it is not occurring through specialised proteins or usage of energy, it is neither passive transport nor uphill transport 
    So the correct answer is 'Osmosis'.
  • Question 7
    1 / -0
    Photolysis of water used in 
  • Question 8
    1 / -0
    Identify the correct sequence of movement of water in the root of higher plants.
    Solution
    Water will take the path of least resistance through root to reach the xylem. Water can move across the root via three different pathways. Once in the endodermal cells, the water freely enters the xylem cells where it joins the fast-moving column of water or transpiration stream, headed to the leaves.
    So the correct option is 'Epidemic - Cortex -Pericycle-endodermis - phloem'.
  • Question 9
    1 / -0
    Read the given statements and select the correct option.
    Statement 1: Plasmolysis is bursting of the cell membrane when a cell is kept in a hypertonic solution.
    Statement 2: Hypertonic solution causes endosmosis.
    Solution
    Plasmolysis is the contraction of the protoplast of a plant cell as a result of the loss of water from the cell. Plasmolysis occurs when the cell is kept in a hypertonic solution. It is due to exosmosis.

    So, the correct option is 'Both statements 1 and 2 are incorrect.'
  • Question 10
    1 / -0
    Force responsible for exudation of liquid drops from the margin of the leaves is
    Solution
    • Negative hydrostatic pressure develops at the time of water loss, it occurs when the water is lost through transpiration and creates tension in the cell.
    • Transpiration is the process in which water is lost through the upper or aerial plant parts in the form of water. 
    • Imbibition is the swelling of cells that occurs due to the absorption of water. 
    • Positive pressure is the force in the xylem which exudates drops of liquids through the stoma to the outside and also requires hydathodes which help in the process of guttation (exudation of water droplets mostly from the leaves margins). 
    So, the correct option is 'Positive pressure'.
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