Assertion :Young leaves are first to show nitrogen deficiency. Reason: There is normal pigment synthesis in nitrogen deficient conditions.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is D Both Assertion and Reason are incorrect Nitrogen is an essential macronutrient for plants. Nitrogen is a mobile element and hence under conditions of nitrogen deficiency, nitrogen is actively mobilised from old and senescing leaves and transferred to young and actively growing parts of plants.
Plants growing in nitrogen deficient soils do not show normal green colour but produce various shades of red and purple due to deficient chlorophyll and anthocyanin production.