Xylem

Q. The following diagrams show the types of secondary thickening in the xylem vessels. Identify the types labelled from A-F. Choose the correct option from those given

1. A-Spiral, B-Annular, C-Reticulate, D-Scalariform, E-Pitted with border, F-Pitted, simple
2. A-Annular, B-Spiral, C-Scalariform, D-Reticulate, E-Pitted with border, F-Pitted, simple
3. A-Annular, B-Spiral, C-Scalariform, D-Reticulate, E-Pitted, simple, F-Pitted with border
4. A-Spiral, B-Annular, C-Scalariform, D-Reticulate, E-Pitted with border, F-Pitted, simple

Q. The only living component of xylem is:

1. Xylem parenchyma
2. Xylem vessels
3. Xylem tracheids
4. Xylem fibres