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Class 9 Biology · Chapter 9 · Test 3

Transpiration and Stomatal Regulation

24 MCQs • Practice transpiration, stomata, guard cells, stomatal opening and closing, and factors affecting the rate of transpiration.

MCQs

24 questions · 20 min · 24 marks

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Sample questions

The first 5 of 24. Try each one, then tap to see the answer.

  1. Question 1

    What is transpiration?

    • ALoss of water in the form of vapours from plant surfaces
    • BMovement of food through phloem
    • CAbsorption of salts from soil
    • DExchange of oxygen through roots
    Show answer

    Answer: A

    Transpiration is the loss of water in the form of vapours from plant surfaces.

  2. Question 2

    Through which parts can transpiration occur?

    • ALeaves cuticle and lenticels
    • BRoots only
    • CXylem only
    • DFlowers only
    Show answer

    Answer: A

    The text states that water loss may occur through leaves, through the cuticle on leaf epidermis, or through special openings called lenticels in stems of some plants.

  3. Question 3

    Most transpiration in leaves occurs through:

    • AStomata
    • BRoots
    • CLenticels
    • DXylem
    Show answer

    Answer: A

    Most transpiration occurs through the stomata.

  4. Question 4

    From where does water move into the cell walls of mesophyll cells?

    • AXylem
    • BPhloem
    • CPericycle
    • DRoot hairs
    Show answer

    Answer: A

    Water moves from the xylem into the cell walls of mesophyll cells.

  5. Question 5

    Where does water evaporate in the leaf?

    • AInto the air spaces of the leaf
    • BInto the xylem of the root
    • CInto the phloem
    • DInto the soil
    Show answer

    Answer: A

    Water evaporates from the moist walls of mesophyll cells into the air spaces of the leaf.

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