Right option is (b) False
To elaborate: Transpirative loss is studied through cobalt chloride test. The color changes when water is absorbed. Girdling experiment is used to test that phloem tissue is responsible for translocation of food. When a ring of bark is removed up to the depth of the phloem layer and in the absence of downward movement of food, the portion of the bark above the ring of the stem is swollen after a few weeks.