221.
Apical dominance is caused by
A
abscisic acid in lateral bud
B
cytokinin in leaf tip
C
gibberellin in lateral buds
D
auxin in shoot tip
Answer :
auxin in shoot tip
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222.
Avena coleoptile tesdt to find out the quantity of growth promoting hormones was discovered by
A
F.W. Went
B
L.J. Oudus
C
K.V. Thimann
D
F. Skoog
Answer :
F.W. Went
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223.
Cell elogation in internodel regions of the green plants takes place due to
A
Ethylene
B
Indoel acetic acid
C
Cytokinin
D
Gibberellins
Answer :
Gibberellins
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224.
Motor or bulliform cells In Grasses shows
A
Growth movement
B
Tropism
C
Nastic movement
D
Turgor movement
Answer :
Turgor movement
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225.
Dormancy of seed is broken by
A
Auxin
B
Gibberellins
C
Ethylene
D
Cytokinin
Answer :
Gibberellins
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226.
"Foolish seeding" disease of rice led to the discovery of
A
IAA
B
GA
C
ABA
D
2, 4-D
Answer :
GA
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227.
Richmond-Lang effect is dut to
A
Cytokinin
B
Auxin
C
ABA
D
All of the above
Answer :
Cytokinin
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228.
Growth curve is
A
S-shapded
B
Sigmoid
C
L-shaped
D
Both A and B
Answer :
Both A and B
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229.
Plants bend toward the light because
A
They need light for photosynthesis
B
They need light for respiration
C
Light attracts them
D
Cell on the shaded side elongate more
Answer :
Cell on the shaded side elongate more
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230.
Which of the following instrument can be used to record plant growth by seconds
A
ARc auxanometer
B
Arc indicator
C
Space marker disc
D
Crescograph
Answer :
Crescograph
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