Some vascular bundles are described as open because these:

1.	are not surrounded by pericycle
2.	are surrounded by pericycle but no endodermis
3.	are capable of producing secondary xylem and phloem
4.	possess conjunctive tissue between xylem and phloem

Given below is the diagram of a stomatal apparatus. In which of the following, all the four parts labelled as A, B, C and D are correctly identified:

Compared to a dicot root, a monocot root has: 

1. Many xylem bundles 

2. Inconspicuous annual rings 

3. Relatively thicker periderm 

4. More abundant secondary xylem 

Identify the incorrectly matched pair:

A vessel less piece of stem possessing prominent sieve tubes would belong to
1. Pines
2. Eucalyptus
3. Grass
4. Trachodendron

Fibres are likely to be absent in

In which of the following pairs of parts of a flowering plant is epidermis absent?
1. Root tip and shoot tip
2. Shoot bud and floral bud
3. Ovule and seed
4. Petiole and pedicel

A conjoint and open vascular bundle will be observed in the transverse section of
1. Monocot root
2. Monocot stem
3. Dicot root
4. Dicot stem

Epiblema of roots is equivalent to
1. Pericycle
2. Endodermis
3. Epidermis
4. Stele

Cells of this tissue are living and show angular wall thickening. They also provide mechanical support. The tissue is
1. Xylem
2. Sclerenchyma
3. Collenchyma
4. Epidermis