It has been possible to raise the yield of resin from chir pine from the existing 1.5 kg per tree to 3.5 kg on the average per tree by using the American Bark Hack method in conjunction with ______ sulfuric acid:
Correct answer: B. 40%
- A. 30%
- B. 40%
- C. 50%
- D. 60%
Explanation
The American Bark Hack method improves resin flow by applying about 40% sulfuric acid to the tapping area. This treatment is associated with raising average chir-pine resin yield from about 1.5 kg to 3.5 kg per tree.
Written and checked by Zahid Hussain, editorLast updated
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