Which of the following statements is true ?
Vessels are multicellular with narrow lumen
Tracheids are multicellular with narrow lumen
Vessels are unicellular with wide lumen
Tracheids are unicellular with wide lumen
Main function of lenticel is
transpiration
guttation
gaseous exchange
bleeding
Vascular tissues in flowering plants develop from
phellogen
plerome
periblem
dermatogen
Out of diffuse porous and ring porous woods, which is correct ?
Ring porous wood, carries move water for short period
Diffuse porous wood carries more water
Ring porous wood carries more water when need is higher
Diffuse porous wood is less specialized but conducts water rapidly through out
Organization of stem apex into corpus and tunica is determined mainly by
planes of cell division
regions of meristematic activity
rate of cell growth
rate of shoot tip growth
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
absence of secondary xylem
absence of secondary phloem
presence of cortex
position of protoxylem
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
cork cambium
vascular cambium
endodermis
pericycle
An organized and differentiated cellular structure having cytoplasm but no nucleus is
vessels
xylem parenchyma
sieve tubes
tracheids
Where do the Casparian bands occur ?
Epidermis
Endodermis
Pericycle
Phloem
What is not true about sclereids ?
These are parenchyma cells with thickened lignified walls
These are elongated and flexible with tapered ends
These are commonly found in the shells of nuts and in the pulp of guava, pear etc
These are also called the stone cells.
