Vascular bundles in monocotyledons are considered closed because:

1.	a bundle sheath surrounds each bundle
2.	cambium is absent
3.	there are no vessels with perforations
4.	xylem is surrounded all around by phloem

A major characteristic of the monocot root is the presence of:

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

1. Secondary xylem

2. Secondary phloem

3. Protoxylem

4. Cortical cells

Tracheids differ from the tracheary elements in:

1. Having casparian strips

2. Being imperforate

3. Lacking nucleus

4. Being lignified

Lenticels are involved in:
1. Gaseous exchange
2. Food transfer
3. Photosynthesis
4. Transpiration

The common bottle cork is a product of:

1. dermatogen

2. phellogen

3. xylem

4. vascular cambium

Companion cells are closely associated with:

Closed vascular bundles lack:

1. Ground tissue

2. Conjuctive tissue

3. Cambium

4. Pith

Water containing cavities in vascular bundles are found in:

1. Sunflower

2. Maize

3. Cycas

4. Pinus

Gymnosperms are also called softwood spermatophytes because they lack:

1. Cambium

2. Phloem fibres

3. Thick-walled tracheids

4. Xylem fibres