Question

Differentiate between sieve tube elements and sieve cells. (4 marks question)

Answer 1

Dear Student,

The difference between sieve tube elements and sieve cells is given below

Sieve tube elements	Sieve cells
Sieve tube elements are short and wider with oblique end walls.	Sieve cells are long and thin with tapering end walls.
Companion cells are present .	Companion cells are present.
It is mostly found in pteridophytes and gymnosperms	It is mostly found in gymnosperms and some seedless vascular plants.
Sieve area is complex and advanced.	Sieve area is of primitive type. Therefore, it is simple without any structural advancement.
Albuminous cells are absent.	Albuminous cells are present.
Sieve tubes and companion cells have same origin therefore considered as sister cells.	Sieve cells and companion cells are of different origin, therefore, considered as non-sister cells.
Sieve pores are present on sieve plates.	Sieve pores are located all along the wall.

Regards