Black (stem) rust of wheat is caused by
Alternaria solani
Ustilago nuda
Puccinia graminis
Puccinia graminis
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
Which one of the following is not a lateral meristem?
Intrafascicular cambium
interfascicular cambium
Phellogen
Phellogen
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
The cork cambium, cork and secondary cortex are collectively called
Phellogen
Periderm
phellem
phellem
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
In land plants, the guard cells differ from other epidermal cells in having
mitochondria
endoplasmic reticulum
chloroplasts
chloroplasts
