Anatomy of Flowering Plants

Vascular bundles in monocotyledons are considered closed because

1. There are no vessels with perforations
2. Xylem is surrounded all around by phloem
3. A bundle sheath surrounds each bundle
4. Cambium is absent

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. Protoxylem
3. Secondary phloem
4. Cortical cells

Tracheids differ from other tracheary elements in :

1. being imperforate
2. having Casparian strips
3. lacking nucleus
4. being lignified

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