A leaf primordium grows into the adult leaf lamina by means of
apical meristem
lateral meristem
marginal meristem
at first by apical meristem and later largely by marginal meristem
A common structural feature of vessel elements and sieve tube elements are
pores on lateral walls
presence of p-protein
enucleate condition
thick secondary walls
Death of protoplasm is a pre-quisite for a vital function like
transport of sap
transport of food
absorption of water
gaseous exchange
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 throughout
Where do the Casparian bands occur?
Epidermis
Endodermis
Pericycle
Phloem
In a longitudinal section of root, starting from the tip upward, the four zones occur in the 3 following order
root cap, cell division, cell enlargement, cell maturation
root cap, cell division, cell maturation, cell enlargement
cell division, cell enlargement, cell maturation, root cap
cell division, cell maturation, cell enlargement, root cap
Bordered pits are found in
sieve cells
vessel wall
companion cells
sieve tube wall
Chlorenchyma is known to develop in the
pollen tube of pinus
cytoplasm of chlorella
mycelium of a green mould such as Aspergillus
spore capsule of a moss
An organized and differentiated cellular structure having cytoplasm but no nucleus is
vessels
xylem parenchyma
sieve tubes
tracheids
Which one yield fibres?
Coconut
Oak
Teak
Sissoo
