Primary Xylem

Q.

What kind of thickening is seen in protoxylem?

1. Reticulate

2. Pitted

3. Annular

4. Scalriform

Q. Anatomically, the root of the fairly old dicotyledonous plant is distinguished from its stem by

1. position of protoxylem
2. absence of secondary xylem
3. absence of secondary phloem
4. presence of cortex

Q. Which among the following is/are constituent(s) of primary xylem?

1. Tracheids
2. Protoxylem
3. Xylem fibres
4. Metaxylem

Q. Which among the following is/are constituent(s) of primary xylem?

1. Tracheids
2. Protoxylem
3. Xylem fibres
4. Metaxylem