PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PARASITES ATTACK THE STEM DUE TO EXPOSURE TO THE ATMOSPHERE
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THE LEAVES CANNOT CARRY OUT PHOTOSYNTHESIS
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SUGAR LEAKS OUT FROM THE RING OF THE BARK
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SUGAR IS NOT TRANSPORTED TO THE ROOTS
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Detailed explanation-1: -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.
Detailed explanation-2: -When a tree has been damaged by removing a ring of bark, the tree may die depending on how completely it was girdled. Removal of even a vertical strip of bark less than one-fourth the circumference of the tree will harm the tree, but not kill the tree.
Detailed explanation-3: -Complete girdling (the bark removed from a band completely encircling the tree) will certainly kill the tree. The reason for damage due to girdling is that the phloem layer of tissue just below the bark is responsible for carrying food produced in the leaves by photosynthesis to the roots.
Detailed explanation-4: -If a complete ring of bark is removed from the trunk, the tree will die because the roots no longer obtain food from the phloem.
Detailed explanation-5: -Removal of ring bark of a tree from the trunk is called as ring barking.