DNA technology is useful in the identification of pathogens that are unable to be grown readily on artificial lab media. pathogens that are no longer alive in the patient sample, species that cannot be differentiated by conventional testing. All of the above. pathogens that are unable to be grown readily on artificial lab media. pathogens that are no longer alive in the patient sample, species that cannot be differentiated by conventional testing. All of the above. Solution DNA technology is useful in the identification of: Pathogens that are unable to be grown readily on artificial lab media Pathogens that are no longer alive in the patient sample, species that cannot be differentiated by conventional testing. All are true as DNA technology is based on genes study which can be done in all these cases thus the option: All of the above is correct.

1. How is the organization of vascular tissues in monocot stems different from the organization of
vascular tissues in eudicot stems?
Solution
Dicot stem Monocot stem Hypodermis is collenchymatous Hypdermis is sclerenchymatous
Vacular bundles are arranged in circular form Vacular bundles are scattered throughout the
ground tissue Xylem elements are polygonal Xylem elements are circular Vascular bundles
are limited from 4 to 8 in number Vascular bundles are numerous Pericycle is present Pericycle
is absent Pith is present Pith is absent Phloem parenchyma and phloem fibres are present
Phloem parenchyma and phloem fibres are present Vascular bundles are not surrounded by
bundle sheath Vascular bundles are surrounded by sclerenchymatous bundle sheath Medullary
rays are present Medullary rays are absent Ground tissue is differentiated into stelar and extra-
stelar tissues Ground tissue is not differentiated Endodermis is present Endodermis is absent
Vascular bundles are conjoint, collateral and open Vascular bundles are conjoint, collateral and
closed Protoxylem lacuna absent Protoxylem lacuna present