1
MHT CET (PCB) 2024 22th April Evening Shift
MCQ (Single Correct Answer)
+1
-0
In which one of the following conditions tobacco plants do NOT flower?
A
Long uninterrupted dark period.
B
Long uninterrupted light period.
C
Short light period with long uninterrupted dark period.
D
Long dark period is interrupted by a flash of red light ( 660 nm ) and immediately followed by far red light ( 730 nm ).
2
MHT CET (PCB) 2024 22th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

According to proton transport theory of stomatal mechanism, protons are formed in the guard cells when _________ .

A
starch is converted into cellulose during daytime.
B
sugar is converted into starch during night time.
C
starch is converted into malic acid during day time which dissociates into malate.
D
potassium malate is formed during night time.
3
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

While studying flowering behaviour in __________ and ___________ plant, Garner and Allard discovered photoperiodism.

A
rice, wheat
B
tobacco, soyabean
C
tomato, soyabean
D
wheat, tobacco
4
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

Phenotypically tall plants can be obtained from genetically dwarf maize plants by application of_________

A
Gibberellins
B
Auxins
C
Ethylene
D
ABA

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