Multiple Choice QuestionsSome vascular bundles are described as open because these
are surrounded by pericycle but no endodermis
are capable of producing secondary xylem and phloem
Possess conjunctive tissue between xylem and phloem
Possess conjunctive tissue between xylem and phloem
Which one of the following is not a lateral meristem?
Intrafascicular cambium
interfascicular cambium
Phellogen
Phellogen
Heartwood differs from sapwood in
Presence of rays and fibres
the absence of vessels and parenchyma
having dead and non-conducting elements
having dead and non-conducting elements
Transport of food material in higher plants takes place through
companion cells
transfusion tissue
tracheids
tracheids
Black (stem) rust of wheat is caused by
Alternaria solani
Ustilago nuda
Puccinia graminis
Puccinia graminis
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
maturing
elongating
widening
widening
In barley stem, vascular bundles are
open and scattered
closed and scattered
open and in a ring
open and in a ring
Vascular tissue in flowering plants develop from
phellogen
plerome
periblem
periblem
B.
plerome
Histogen theory for shoot apical meristem has been proposed by Hastein (1870).It advocates that there are three distinct meristematic zones (layers) called dermatogen periblem and plerome. The dermatogen is the outermost histogen giving rise to the epidermis, periblem is the middle one producing the cortex and plerome is the innermost resulting in the certain cylinder (ie, vascular tissue).
Cork cambium (phellogen) is the secondary lateral meristem found in the outer cortical region. Its cells divide periclinally cutting offf cells towards the outside (formingcork or phellem) and inside (forming secondary cortex or phelloderm).
For a critical study of secondary growth in plants. which one of the following pairs is suitable?
Sugarcane and sunflower
Teak and pine
Deodar and fern
Deodar and fern
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