Phloem transport – nature of phloem sap

2016 Phase II 1 question

1. 1 Transport in Plants
   A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
   A Low refractive index B Absence of sugar C Acidic D Alkaline
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