Soil pH and Plant Growth Conditions Quiz
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Questions and Answers

Why are strongly acidic soils (pH 4.0) unfavourable for plant growth?

  • They have high levels of basic cations like Ca, Mg, K, and Na.
  • They have low levels of toxic elements like Al, Mn, and Fe.
  • They have optimal pH levels for plant growth.
  • They interfere with the growth of crops and reduce yield. (correct)

    • What can happen to the concentration of Al, Mn, and Fe in extremely acidic soils (pH 4.0)?

  • Disintegrate
  • Decrease
  • Remain constant
  • Increase to toxic levels (correct)

    • What effect do strongly alkaline soils (pH 8.5) have on crop production?

  • Promote crop growth
  • Enhance nutrient absorption
  • Reduce yield (correct)
  • Prevent diseases

    • Why should soils be limed when their pH falls below 5.0?

    <p>To enhance plant growth</p> Signup and view all the answers

    Which soil pH requirement is most suitable for Rice (upland) cultivation?

    <p>5.0-6.5</p> Signup and view all the answers

    How does the Cation Exchange Capacity (CEC) of soil affect nutrient availability?

    <p>Higher CEC leads to greater nutrient availability.</p> Signup and view all the answers

    How does soil pH affect the availability of nutrients for plant growth?

    <p>Low pH decreases nutrient availability</p> Signup and view all the answers

    What effect does a high cation exchange capacity (CEC) have on plant growth?

    <p>Increases nutrient uptake by plants</p> Signup and view all the answers

    Why is fertile soil generally dark in color?

    <p>Dark color indicates high fertility and organic content</p> Signup and view all the answers

    How does soil color impact the availability of nutrients in the soil?

    <p>Soil color does not affect nutrient availability</p> Signup and view all the answers

    What is the role of soil pH in determining the quality of soil for plant growth?

    <p>Ideal pH levels in soil promote optimal plant growth</p> Signup and view all the answers

    How does soil pH affect the absorption of nutrients by plant roots?

    <p>Nutrient absorption is not impacted by soil pH</p> Signup and view all the answers

    What is the critical role of temperature in plant growth?

    <p>Influences seed germination and flowering processes</p> Signup and view all the answers

    Why is an inadequate amount of water detrimental to plant growth?

    <p>Results in reduced yields and crop quality</p> Signup and view all the answers

    What temperature range do plants generally require to survive?

    <p>20oC to 25oC</p> Signup and view all the answers

    How does water influence the opening and closing of stomata in plants?

    <p>Leads to decreased CO2 entry into the cell</p> Signup and view all the answers

    What happens when plants are exposed to temperatures above their survival range?

    <p>Their maturity is delayed</p> Signup and view all the answers

    How does water help cool down plants during the transpiration process?

    <p>By releasing excess heat to the atmosphere</p> Signup and view all the answers

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