Anatomy of Flowering Plants

Lenticels are involved in

1. Food transport
2. Photosynthesis
3. Transpiration
4. Gaseous exchange

Age of a tree can be estimated by :

1. Diameter of its heartwood
2. Number of annual rings
3. Its height and girth
4. Biomass

Interfascicular cambium develops from the cells of :

1. Endodermis
2. Pericycle
3. Medullary rays
4. Xylem parenchyma

Meristematic tissue responsible for increase in girth of tree trunk is :

1. Phellogen
2. Intercalary meristem
3. Apical meristem
4. Lateral meristem

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