Absorption, Transport & Water Loss (Transpiration) in Plants : 12th Class Biology Q Ans Lesson 8 – NIOS

Absorption, Transport & Water Loss (Transpiration) in Plants : 12th Class Biology Q Ans Lesson 8 – NIOS

Absorption, Transport & Water Loss (Transpiration) in Plants : 12th Class Biology Q Ans Lesson 8 - NIOS


  1. Define diffusion.
    Ans. Movement of molecules from their region of higher concentration to theregion of lower concentration.
  2. Give one point of difference between osmosis and diffusion.
    Ans. A semipermeable membrane is required for osmosis and not necessarily for diffusion.
  3. Name the process because of which crystals of KMnO4 added to water makesit purple.
    Ans. Diffusion
  4. If blood cells are placed in salt water what will happen to them ? Based on youranswer state if salt solution is isotonic, hypotonic or hypertonic?
    Ans. Water will move out from the blood cells and they will shrink.
  5. When does plasmolysis occur in plant cells?
    Ans. When the cell is placed in a hypertonic solution
  6. Name the phenomenon which makes it difficult to close a wooden door aftermonsoon?
    Ans. Imbibition


  1. Which part of the plant absorbs water and minerals?
    Ans. Root
  2. What are plasmodesmata?
    Ans. Cytoplasmic connections between plant cells
  3. How does translocation occur in plants?
    Ans. Through the pholem
  4. What is the process of ascent of sap?
    Ans. Movement of water and minerals from roots to leaves, that is from the
    ground to tip of plant.

  5. Which are three different forms in which water is present in the soil?
    Ans. Gravitational, Hygroscopic and capillary


  1. Name the pressure in guard cells responsible for opening and closing of stomata.
    Ans. Turgor pressure
  2. Mention the shape of guard cells in monocots and dicots.
    Ans. Dicot : Kidney shaped
    Monocots : Dumb bell shaped
  3. Give a point of difference between a stoma and a hydathode
    Ans. Stomata – are pores on the leaf surface through which water diffuses asvapour
    Hydathodes – special pores in leaf margins through which water is lost
    as water droplets.


  1. Name two types of passive absorption in plants.
  2. In what ways diffusion is important to a plant ?
  3. Name various factors that affect osmosis in plants.
  4. Differentiate between turgor pressure and wall pressure.
  5. Discuss the mechanism of stomatal opening in dicot plants.
  6. Explain any four factors that affect transpiration in plants.
  7. Describe an experiment to demonstrate osmosis by potato osmometer.
  8. Discuss the cohesion tension theory for uptake of water in plants.
  9. Describe the mechanism of translocation of solutes. Name the most appropriate
    theory for the translocation of solutes in plants. Who proposed this theory ?
  10. Differentiate between symplast and apoplast pathway of water movement in
  11. Define transpiration.
  12. Name the holes in the bark through which transpiration in the bark of old
    trees takes place ?
  13. Why is transpiration considered to be a necessary evil ?
  14. Give one way by which desert plants prevent transpiration.
  15. State one point of difference between transpiration and guttation.

NIOS 12th class biology Q Ans

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