2006
NEET
MCQ
AIPMT 2006
Treatment of seeds at low temperature under moist conditions to break its dormancy is called
A.
stratification
B.
scarification
C.
vernalization
D.
chelation.
2006
NEET
MCQ
AIPMT 2006
An enzyme that can stimulate germination of barley seeds is
A.
invertase
B.
$\alpha $-amylase
C.
lipase
D.
protease
2006
NEET
MCQ
AIPMT 2006
How does pruning help in making the hedge dense?
A.
It releases wound hormones.
B.
It induces the differentiation of new shoots from the rootstock.
C.
It frees axillary buds from apical dominance.
D.
The apical shoot grows faster after pruning.
2006
NEET
MCQ
AIPMT 2006
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
A.
Application of iron and magnesium to promote synthesis of chlorophyll
B.
Frequent irrigation of the crop
C.
Treatment of the plants with cytokinins along with a small does of nitrogenous fertilizer
D.
Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophhenoxy acetic acid
2005
NEET
MCQ
AIPMT 2005
The ability of the Venus Flytrap to capture insects is due to
A.
specialized ''muscle-like'' cells
B.
chemical stimulation by the prey
C.
a passive process requiring no special ability on the part of the plant
D.
rapid turgor pressure changes.
2004
NEET
MCQ
AIPMT 2004
Cell elongation in internodal regions of the green plants takes place due to
A.
indole acetic acid
B.
cytokinins
C.
gibberellins
D.
ethylene.
2004
NEET
MCQ
AIPMT 2004
One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
A.
Long day
B.
Darkness neutral
C.
Day neutral
D.
Short day
2003
NEET
MCQ
AIPMT 2003
Nicotiana sylvestris flowers only during long days and N.tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering N.sylvestris and N.tabacum to be separate species?
A.
They cannot interbreed in nature
B.
They are reproductively distinct
C.
They are physiologically distinct
D.
They are morphologically distinct
2003
NEET
MCQ
AIPMT 2003
Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone
A.
auxin
B.
cytokinin
C.
ethylene
D.
abscisic acid.
2003
NEET
MCQ
AIPMT 2003
Differentiation of shoot is controlled by
A.
high auxin : cytokinin ratio
B.
high cytokinin : auxin ratio
C.
high gibberellin : auxin ration
D.
high gibberellin : cytokinin ratio.
2003
NEET
MCQ
AIPMT 2003
Coconut milk factor is
A.
abscisic acid
B.
an auxin
C.
a gibberellin
D.
cytokinin
2002
NEET
MCQ
AIPMT 2002
Dwarfness can be controlled by treating the plant with
A.
cytokinin
B.
gibberellic acid
C.
auxin
D.
antigibberellin.
2002
NEET
MCQ
AIPMT 2002
Seed dormancy is due to the
A.
ethylene
B.
abscisic acid
C.
IAA
D.
starch.
2001
NEET
MCQ
AIPMT 2001
Hormone responsible for senescence is
A.
ABA
B.
auxin
C.
GA
D.
cytokinin
2001
NEET
MCQ
AIPMT 2001
Which of the following prevents the fall of fruits?
A.
GA3
B.
NAA
C.
Ethylene
D.
Zeatin
2001
NEET
MCQ
AIPMT 2001
Which hormone breaks dormancy of potato tuber?
A.
Gibberellin
B.
IAA
C.
ABA
D.
Zeatin
2001
NEET
MCQ
AIPMT 2001
Which plant is LDP?
A.
Tobacco
B.
Glycine max
C.
Mirabilis jalapa
D.
Spinach
2000
NEET
MCQ
AIPMT 2000
If the apical bud has been removed then we observe
A.
more lateral branches
B.
more axillary buds
C.
plant growing stops
D.
flowering stops.
2000
NEET
MCQ
AIPMT 2000
By which action a seed coat becomes permeable to water
A.
scarification
B.
stratification
C.
vernalization
D.
all of the above.
2000
NEET
MCQ
AIPMT 2000
Which hormone is responsible for fruit ripening?
A.
Ethylene
B.
Auxin
C.
Ethyl chloride
D.
Cyctokinin
2009
NEET
MCQ
AIPMT 2009
One of the synthetic auxin is
A.
IAA
B.
GA
C.
IBA
D.
NAA
2019
AIIMS
MCQ
AIIMS 2019
Assertion : Gibberellin is useful in early seed production in conifers.
Reason : Ethephon is responsible for early ripening in tomato and apple.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
B.
If both assertion and reason are true, but reason is not the correct explanation of assertion.
C.
If assertion is true, but reason is false.
D.
If both assertion and reason are false.
2018
AIIMS
MCQ
AIIMS 2018
Apical dominance is caused by
A.
auxin
B.
ethylene
C.
gibberellin
D.
cytokinin
2018
AIIMS
MCQ
AIIMS 2018
Assertion : The quiescent centre acts as a reservoir of relatively resistant cells, which constitute a permanent source of active initials.
Reason : The cells of the inactive region of quiescent centre become active, when the previous active initials get damaged.
A.
Both A and R are true and R is the correct explanation of A
B.
Both A and R are true, but R is not the correct explanation of A
C.
A is true, but R is false
D.
A and R are false
2018
AIIMS
MCQ
AIIMS 2018
Assertion Photomodulation of flower is phytochrome regulated process.
Reason Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.
A.
Both A and R are true and R is the correct explanation of A
B.
Both A and R are true, but R is not the correct explanation of A
C.
A is true, but R is false
D.
A and R are false