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AIIMS 2007
Exam
AIIMS
Year
2007
Subject
Botany
Chapter
Ecosystem

AIIMS 2007 · Botany · Ecosystem

Assertion : Plants absorb sulphur in the form of sulphate ions....

Assertion : Plants absorb sulphur in the form of sulphate ions. Reason : Sulphur bacteria are required for the formation of sulphate.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

Organic sulphur is made available to the plant through biological oxidation through the activity of certain microorganisms. Sulphur is transformed from the organic form to the sulfate ion, the form of sulphur that higher plants absorb. Soil microorganisms oxidize not only organic sulphur but also sulphide minerals such as ferrous sulphide. The elemental sulphur is then oxidized to sulphate by sulphur bacteria.
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