Anatomy of Flowering Plants · Question 46

Which of the following statements is not true for stomatal apparatus ?

1. Stomata are involved in gaseous exchange
2. Inner walls of guard cells are thick
3. Guard cells invariably possess chloroplasts and mitochondria
4. Guard cells are always surrounded by subsidiary cells

As compared to a dicot root, a monocot root has

1. More abundant secondary xylem
2. Relatively thicker periderm
3. Many xylem bundles
4. Inconspicuous annual rings

Gymnosperms are also called softwood spermatophytes because they lack

1. Cambium
2. Thick-walled tracheids
3. Phloem fibres
4. Xylem fibres

Water containing cavities in vascular bundles are found in

1. Maize
2. Cycas
3. Sunflower
4. Pinus

Closed vascular bundles lack

1. Ground tissue
2. Conjunctive tissue
3. Cambium
4. Pith

Companion cells are closely associated with

1. Sieve elements
2. Trichomes
3. Vessel elements
4. Guard cells

The common bottle cork is a product of

1. Phellogen
2. Xylem
3. Vascular Cambium
4. Dermatogen

Some vascular bundles are described as open because these :

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

The cork cambium, cork and secondary cortex are collectively called :

1. Periderm
2. Phellem
3. Phellogen
4. Phelloderm

Ground tissue includes :

1. All tissues external to endodermis
2. Epidermis and cortex
3. All tissues internal to endodermis
4. All tissues except epidermis and vascular bundles