Question 3
Which of these pairs is correct?
The right answer is the one marked above.
Parenchyma is simple; xylem is complex. Parenchyma is one kind of cell throughout; xylem contains vessel cells, tracheids, fibres and parenchyma.
Xylem contains xylem parenchyma among its four cell types — which is part of why it is complex, not why it is simple.