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?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

Acidic

Alkaline

Low refractive index

Absence of sugar

answer is B.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Phloem sap made up of non-reducing sugars, amides, ureides, PGR and little bit inorganic elements. Due to amides and ureides with very less electrolytes the overall pH of phloem sap is alkaline, because amides and ureides are rich of NH2 groups. In contrast to phloem, in xylem Amides & ureides are present with huge amount of mineral elements so overall pH of xylem sap, even in presence of amides & ureides will not be alkaline. Hence alkaline pH is indictor of phloem sap.

Watch 3-min video & get full concept clarity