41.
Essential oils are those which
A
Yield perfumes
B
Function as lubricants
C
Are essential for human beings
D
Are essential for plants
Answer :
Yield perfumes
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42.
Bacillus thuringiensis is used to control
A
Moth
B
Flies
C
Mosquito
D
All of the above
Answer :
All of the above
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43.
Which one among the following chemicals is used for causing defoliation of forest trees?
A
Phosphon-$$D$$
B
Malic hydrazide
C
2, 4-Dichlorophenoxy acetic acid
D
Amo-1618
Answer :
2, 4-Dichlorophenoxy acetic acid
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44.
The young chicken raised specifically for meat are called
A
Broulers
B
Cockerels
C
Pellets
D
Hen
Answer :
Broulers
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45.
A green manure supplies
A
Organic matter
B
Additional nitrogen
C
Protect soil againt erosion and leaching
D
All of the above
Answer :
All of the above
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46.
Opium is obtained from poppy in the form of
A
Gum
B
Resin
C
Latex
D
Tannin
Answer :
Latex
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47.
A technique of micropropagation is:
A
Somatic embryogenesis
B
Protoplast fusion
C
Embryo rescue
D
Somatic hybridization
Answer :
Somatic embryogenesis
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48.
Hybrid vigour is due to
A
Chiasma
B
Linkage
C
Crossing over
D
Heterozygosity
Answer :
Heterozygosity
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49.
In crop improvement programme, haploids are important because they
A
require one half of nutrients
B
are helpful in study of meiosis
C
grow better under adverse conditions
D
form perfect homozygous
Answer :
form perfect homozygous
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50.
Which of the following organism derives energy for N2 fixation by performing photosynthesis
A
Anabaena
B
Azotobactor
C
Rhizobium
D
Bacillus
Answer :
Anabaena
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