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MEDIUM
ENGLISH
Agriculture
Plants growing in oxygen deficient soils possess:
A
No roots
Option A
B
Longer roots system
Option B
C
Aerial roots system
Option C
D
Shallow root system
Option D
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MEDIUM
ENGLISH
Agriculture
When one population is harmed and the other remains unaffected the relationship is called:
A
Amensalism
Option A
B
Predation
Option B
C
Protoco-operation
Option C
D
Parasitism
Option D
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MEDIUM
ENGLISH
Agriculture
The device or structure where plants are grown in a controlled environment:
A
Culture chamber
Option A
B
Inoculation chamber
Option B
C
Phytotron
Option C
D
All of these
Option D
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MEDIUM
ENGLISH
Agriculture
The term symbiosis was proposed by:
A
Mc Dougal
Option A
B
Warming
Option B
C
Odum
Option C
D
de Bary
Option D
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MEDIUM
ENGLISH
Agriculture
The zone of soil showing microbial activity around the roots of higher plants is called:
A
Rhizosphere
Option A
B
Rhizoplane
Option B
C
Soil microflora
Option C
D
All of these
Option D
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MEDIUM
ENGLISH
Agriculture
Odum did not recognise the following relationship as a positive interaction:
A
Commensalism
Option A
B
Protoco-operation
Option B
C
Mutualism
Option C
D
Antibiosis
Option D
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MEDIUM
ENGLISH
Agriculture
The seeds of Rhus can endure a temperature as high as:
A
40?C
Option A
B
60?C
Option B
C
65?C
Option C
D
80?C
Option D
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MEDIUM
ENGLISH
Agriculture
The advantage/s of fire:
A
Reduction of biotic thrust
Option A
B
Destruction of diseased plants
Option B
C
Both (a) & (b)
Option C
D
None of these
Option D
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MEDIUM
ENGLISH
Agriculture
The lichens show a mutualistic relationship originating from:
A
Obligate parasitism
Option A
B
Facultative parasitism
Option B
C
Halotism
Option C
D
None of these
Option D
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MEDIUM
ENGLISH
Agriculture
Plants growing on burnt soil are called:
A
Heliophilous
Option A
B
Hydrophilous
Option B
C
Pyrophilous
Option C
D
Pyriform
Option D
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MEDIUM
ENGLISH
Agriculture
Flag trees’ are formed due to:
A
Lodging
Option A
B
Erosion and deperition
Option B
C
Unidirectional wind
Option C
D
Salt spray
Option D
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MEDIUM
ENGLISH
Agriculture
The relationship between a climber and the host corresponds to:
A
Neutralism
Option A
B
Mutualism
Option B
C
Parasitism
Option C
D
Commensalism
Option D
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MEDIUM
ENGLISH
Agriculture
The air density is maximum:
A
Above 32′
Option A
B
At the soil surface
Option B
C
Between 32′ – 64′ from soil level
Option C
D
In the hydrosphere
Option D
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MEDIUM
ENGLISH
Agriculture
According to Mc Dougal, the parasitism caused due to fungi and bacteria represent a symbiotic relationship which is:
A
Social and antagonistic
Option A
B
Nutritive and antagonistic
Option B
C
Social and reciprocal
Option C
D
Nutritive and reciprocal
Option D
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MEDIUM
ENGLISH
Agriculture
An anatomical features, which exclusively develops to counter high velocity of wind:
A
Reaction wood formation
Option A
B
Absence of secondary growth
Option B
C
Absence of tylosis
Option C
D
All of these
Option D
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MEDIUM
ENGLISH
Agriculture
According to Geiger, the percentage of light reflected by the clouds is:
A
9%
Option A
B
10%
Option B
C
48%
Option C
D
39%
Option D
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MEDIUM
ENGLISH
Agriculture
Plants growing in alpine zone are dwarf due to:
A
Low temperature
Option A
B
High wind velocity
Option B
C
High light intensity
Option C
D
None of these
Option D
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MEDIUM
ENGLISH
Agriculture
The percentage of light from total solar input utilized by plants:
A
About 1%
Option A
B
3 – 5%
Option B
C
7 – 8%
Option C
D
14%
Option D
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MEDIUM
ENGLISH
Agriculture
The percentage of argon in the atmosphere is:
A
About 1%
Option A
B
0.35%
Option B
C
0.90%
Option C
D
3%
Option D
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MEDIUM
ENGLISH
Agriculture
Which of the following is a short day plant?
A
Triticum
Option A
B
Lycopersicon
Option B
C
Gossypium
Option C
D
Nicotiana
Option D
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