EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Plants grow best when the soil is slightly acidic.
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Plants grow best when the soil is slightly basic.
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Plants grow best when the pH range is between 4 and 10.
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Plants grow best when the pH range is between 5 and 7.
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Detailed explanation-1: -The pH range of 5.5-7 is highly suitable for plant growth and hence such a soil is considered fertile. Thus the correct answer is option D.
Detailed explanation-2: -Soil pH is measured on a simple scale that ranges from 0 to 14. The midpoint, pH 7, denotes a neutral soil, which is neither acid or alkaline. Anything below pH 7 is acidic (or ericaceous), and the lower the pH number, the more acidic the soil is.
Detailed explanation-3: -Bacteria that change and release nitrogen from organic matter and some fertilizers operate best in the pH range of 5.5 to 7.0 making this the optimum pH range. Plant nutrients leach from the soil much faster at pH values below 5.5 than from soils within the 5.5 to 7.0 range.
Detailed explanation-4: -It specifically affects plant nutrient availability by controlling the chemical forms of the different nutrients and influencing the chemical reactions they undergo. The optimum pH range for most plants is between 5.5 and 7.5; however, many plants have adapted to thrive at pH values outside this range.