1
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
2
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Palisade parenchyma is absent in leaves of -
A
Mustard
B
Sorghum
C
Soybean
D
Gram
3
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
What is true about Bt toxin ?
A
The activated toxin enters the ovaries of the pest to sterillise it and thus prevent its multiplication.
B
Bt protein exists as active toxin in the Bacillus
C
The concerned Bacillus has antitoxins
D
The inactive protoxin gets converted into active form in the insect gut
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