I want to ask a question about xylem in the centre of the root.
I am reading a book about transport in plants, and it reads this regarding the root structure:
Roots are subjected to vertical stresses - they have to be able to resist being pulled out of the soil.
A central core of strong xylem tissue gives ideal resistance to being uprooted and at the same time gives economy of space.
I'm confused about this passage. How does the centre of the root being xylem tissue exactly prevent the resistance to pulling forces upwards out of the soil?