Question

Concentration of xylem sap is
A. More than phloem
B. Lesser than phloem
C. Equal in both
D. None of the above

Answer 1

Hint:
Xylem and phloem constitute the complex tissues in plants. Xylem functions as a conducting tissue for water and minerals from roots to the stem and leaves. Phloem functions as a conducting tissue for prepared food materials usually from leaves to other parts of the plant.

Complete step by step answer:
Phloem and xylem are the complex tissues in plants. They are made of more than one type of cell and these work together as a unit.
A sap is a liquid portion that is transported by xylem cells and phloem cells.
Xylem is a vascular tissue in land plants which is primarily functioning for the distribution of water and minerals taken up by the roots. It also gives mechanical strength to the plants.
Phloem is a vascular tissue in land plants primarily responsible for the distribution of sugars and nutrients manufactured in the shoot.
Since xylem transport minerals and water and phloem transport prepared sugar. Hence, sugar will be in higher concentration in phloem and xylem sap will be less concentrated as it contains water. Xylem sap will be more watery as compared to the phloem sap.

So, the correct answer to the above question is option (B) i.e. Lesser than phloem.

Note:
The function of xylem is to transport minerals and water due to which in xylem sap the concentration of water is more. The function of phloem is to transport sugars that are prepared, the sugar increases the concentration of phloem sap. So the concentration of xylem sap is less than that of phloem sap.