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
C.
having dead and non-conducting elements
As a result of continued secondary growth in subsequent years, the older part of secondary xylem or wood becomes non - functional as it loses the power of conduction. The cells of this wood are filled with resins or tennis produced by adjacent functional, secondary xylem becomes hard, durable and blackish in colour, called heartwood, Now, the function of secondary xylem( water and mineral conduction from roots) is performed by outer younger-rings of xylem, which is called sapwood.
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
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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