Multiple Choice QuestionsIn land plants, the guard cells differ from other epidermal cells in having
mitochondria
endoplasmic reticulum
chloroplasts
chloroplasts
The cork cambium, cork and secondary cortex are collectively called
Phellogen
Periderm
phellem
phellem
Function of copanion cells is
providing energy to sleve elements for active transport
Providing water to phloem
loading of sucrose into sieve elements by passive transport
loading of sucrose into sieve elements by passive transport
Some 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
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