Which exposed wood will decay faster ?
Sapwood
Softwood
Wood with lot of fibres
Heartwood
At maturity which of the following is enucleate ?
Sieve cell
Companion cell
Palisade cell
Cortical cell
Vascular tissues in flowering plants develop from
phellogen
plerome
periblem
dermatogen
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
Abnormal/anomalous secondary growth occurs in
Dracaena
ginger
wheat
sunflower
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
maturing
elongating
widening
differentiating
Procambium forms
only primary vascular bundles
only vascular cambium
only cork cambium
primary vascular bundles and vascular cambium
Vascular cambium produces
primary xylem and primary phloem
secondary xylem and secondary phloem
primary xylem and secondary phloem
secondary xylem and primary phloem
Collenchyma occurs in the stem and petioles of
xerophytes
monocots
dicot herbs
hydrophytes
An organized and differentiated cellular structure having cytoplasm but no nucleus is
vessels
xylem parenchyma
sieve tubes
tracheids
