Growth rings are formed due to activity of :
extrastelar cambium
intrastelar cambium
interstelar cambium
both 'b' and 'c'
D.
both 'b' and 'c'
Intrafascicular or intrastelar cambium is present between xylem and phloem in dicot stem and roots. Pith rays, present between the edges of intrafascicular cambium, divide to form a new cambium strip between the two vascular bundle i.e. interfascicular cambium. Thus, inter and intra fascicular cambium together forms a complete cambium ring, called as vascular cambium, which forms secondary xylem on inner side and secondary phloem on outer side. Differential cambial activity during autumn and spring season result in narrow and wide secondary xylem rings respectively, which together forms the annual growth ring. Thus, annual growth ring is derived from vascular cambium, which is derived from inter and intrastelar cambium.
Quiescent centre is found in root apex and acts as
permanent source of active initiates
reservoir of resistant cells
reservoir of passive cells to form new root apex if root apex is damaged/ killed
all of the above
Which type of meristems allow the fallen stems of cereals/ grasses to become erect?
Apical meristem
Lateral meristem
Intercalary meristem
Secondary meristem
An open collateral bundle is one in which :
xylem and phloem are seprated by cambium;
xylem and phloem lie side by side
cambium occurs on the out side of bundle
cambium does not occur in the bundle
Cook cambium and vascular cambium are :
parts of secondary xylem and phloem
parts of pericycle
lateral meristems
apical meristems
Phytotron is :
a controlled condition chamber for tissue
leaf culture process
special culture of plants
root culture process
Largest number of chloroplast is found in :
palisade tissue
spongy tissue
transfusion tissue
bundle sheath cells
