1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Heartwood differs from sapwood in –
A
Having dead and non-conducting elements
B
Being susceptible to pests and pathogens
C
Presence of rays and fibres
D
Abscence of vessels and parenchyma
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
The chief water conducting elements of xylem in gymnosperms are :
A
Fibres
B
Transfusion tissue
C
Vessels
D
Tracheids
3
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by :
A
Absence of secondary phloem
B
Presence of cortex
C
Position of protoxylem
D
Absence of secondary xylem
4
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is -
A
Maturing
B
Widening
C
Elongating
D
Differentiating
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