Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous by
the absence of secondary xylem
the absence of secondary phloem
the presence of cortex
the presence of cortex
D.
the presence of cortex
In dicotyledonous root, the condition of xylem is exarch as the protoxylem away from the centre and metaxylem onwards the centre. In dicotyledonous stem (eg, Cucubita), the condition of xylem is endarch as the metaxylem away from the centre and protoxylem towards the centre.
Which one of the following is a xerophytic plant in which the stem is modified into the flag green and succulent structure?
Opunita
Casuarina
Hydrilla
Hydrilla
Which one of the following scientist's name is correctly matched with the theory put forth by him?
Weissmann-Theory of continuity of germplasm
Pasteur - Inheritance of acquired characters
de Vries - Natural selection
de Vries - Natural selection
A fruit developed from hypanthodium inflorescence is called
hesperidium
sorosis
syconus
syconus
Coiling of garden pea tendrils around any support is an example of
thigmotaxis
thigmonasty
thigmotropism
thigmotropism
The fleshy receptacle of syconus of fig encloses a number of
achenes
samaras
berries
berries
Dry indehiscent single-seeded fruit formed from bicarpellary syncarpous inferior ovary is
Caryopsis
cypsela
Adiantum
Adiantum
