Multiple Choice QuestionsCook 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
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.
Velamen is a specialized tissue found in
aerial roots of orchids
succulent leaves
pneumatophores
stilt roots
Assertion : Monocot stem bears collateral open vascular bundles.
Reason : If cambium is absent such vascular bundles are called closed type.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true.
Which of the following characters are not applicable to the anatomy of dicot stem and choose the correct options given below.
(A) Collenchymatous hypodermis
(B) Polyarch xylem
(C) Presence of casparian strips on the endodermis
(D) Open vascular bundle
(E) Presence of medullary rays
(A), (D) and (E) only
(B) and (C) only
(B) and (E) only
(A), (B) and (C) only
(A), (B) and (C) only
Switch
