Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by ____________.
absence of secondary xylem
absence of secondary pholem
Presence of cortex
position of protoxylem
The apical meristem of the root is present ____________.
in all the roots
only in radicals
only in tap roots
only in adventitious roots
Loading of phloem is related to ________________.
increases of sugar in phloem
elongation of phloem cell
separation of phloem parenchyma
strengthening of phloem fibre
What is not true about sclereids ?
These are parenchyma cells with thickness lignified walls
These are elongated and flexible with tapered ends
These are commonly found in the shells of nuts andin the pulp of guava, pear etc
These are also called the stone cells.
Example for apical meristem.
Secondary meristem
Lateral meristem
Apical meristem
Primary meristem
Only living member in xylem tissue is ,______________
Xylem vessels
Tracheids
X.Parenchyma
Fibres
Which is correct transport or conduction of substances?
organic food moves up through phloem
organic food moves up through xylem
Inorganic food moves upwardly and downwardly through phloem
Inorganic food moves upwardly and downwardly through xylem
Bordered pits are found in ________________.
sieve cells
vessel wall
companion cell
sieve tube wall
Structurally and functionally specialised tissue,derived from primary and secondary meristems are called __________
Permenent tissues
Temperory tissues
cork cells
Bark cells
What is true about a monocot leaf?
Reticulate venation
Absence of bulliform cells from epidermis
Mesophyll not differenitiated into palisade and spongy tissues
well differentiated mesophyll