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Question
Assertion :Girdling is removal of xylem tissues from a stem or branch. Reason: Girdling give the evidence for translocation of sugar through xylem tissue.
Assertion :Girdling is removal of xylem tissues from a stem or branch. Reason: Girdling give the evidence for translocation of sugar through xylem tissue.
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Solution
The correct option is D Both Assertion and Reason are incorrect.
Girdling is removal of bark in a ring at a certain height above ground as a girdle. The secondary phloem is removed as it is a part of bark and sugars cannot be transported to the plant parts located below the girdle. The lower plant parts consequently die. The upper parts of plant continue to receive water and mineral supply, because they are conducted through xylem elements. The xylem is deeply lodged inside the stem and is not part of bark.
Girdling is removal of bark in a ring at a certain height above ground as a girdle. The secondary phloem is removed as it is a part of bark and sugars cannot be transported to the plant parts located below the girdle. The lower plant parts consequently die. The upper parts of plant continue to receive water and mineral supply, because they are conducted through xylem elements. The xylem is deeply lodged inside the stem and is not part of bark.
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