_______ is the middle part of the root where the xylem and phloem do their work in transporting nutrients to other parts of the plant.
A. cortex layer
B. epidermal layer
C. primary root
D. vascular cylinder

Question

_______ is the middle part of the root where the xylem and phloem do their work in transporting nutrients to other parts of the plant.
	A.	cortex layer
	B.	epidermal layer
	C.	primary root
	D.	vascular cylinder

anonymous · Answer

option D because xylem and phloem are collectively called vascular bundles  and since in most plants they have cylindrical from so i would go with option d  cortex surrounds the xylem and phloem and epidermis surrounds the cortex   and primary root means all these parts together  also defined as the first root of the plant