Q. 144.6( 14 Votes )

Explain why xylem tr

Answer :

Xylem transports only inorganic nutrients like water and minerals. The source for water and minerals is soil; from the soil the inorganic nutrients move upward. Since this movement is in only one direction xylem transport is unidirectional. Phloem transports mainly organic substances like food. The source in this transport is understood to be that part of the plant which synthesises the food, i.e., the leaf and sink, the part that needs or stores the food. But, the source and sink may be reversed depending on the season, or the plant’s needs. Sugar stored in roots may be mobilised to become a source of food in the early spring when the buds of trees, act as sink; they need energy for growth and development of the photosynthetic apparatus. Since the source-sink relationship is variable, the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

The arrangement oBiology - Exemplar

Some varieties ofBiology - Exemplar

Comment upon the Biology - Exemplar

Sunflower is not Biology - Exemplar

Trace the events Biology - Exemplar

Name the two impoBiology - Exemplar

Oxygen is criticaBiology - Exemplar

Lichen is usuallyBiology - Exemplar

What special anatBiology - Exemplar

A sample of urineBiology - Exemplar