This set of Agricultural Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Genetic Engineered Resistance against Herbicide”.
1. Modern herbicides interfere with the amino acid biosynthesis in plants.
a) True
b) False
View Answer
Explanation: The development of crop plants that are tolerant to herbicide is an important approach to control weeds. Amino acid biosynthesis in plants is interfered by herbicides that are used in the recent days.
2. How many methods are available for the transfer of resistance of the herbicide?
a) 2
b) 3
c) 4
d) 5
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Explanation: Among the two methods, first approach includes modification of the target side. The second option is to detoxify the herbicide.
3. Which is the herbicide detoxicified by nitrilase?
a) Glyphosate
b) Bromoxynil
c) Atrazine
d) Imidazolinones
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Explanation: Nitrilase is coded by gene b*n in Klebsiella penumoniae and it detoxifies the herbicide Bromoxynil. Phosphinothricin acetyl transferase detoxifies the herbicide PPT (L-phosphinothricin).
4. Atrazine inhibits photosynthesis.
a) True
b) False
View Answer
Explanation: A 32k Da protein, QB is responsible for herbicide binding and is encoded by psb A gene. The DNA sequences of psb A are highly conserved in different plants.
5. ______________ is the active ingredient of herbicide ‘Basta’.
a) L-phosphinothricin
b) Glutathione
c) Nitrilase
d) PAT
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Explanation: L-phosphinothricin is a naturally occurring amino acid. PPT is a potent inhibitor of glutamine synthase. It causes rapid increase in ammonia concentration in plants.
6. What is the target product of Atrazine?
a) EPSPS
b) ALS
c) GS
d) Qb
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Explanation: The use of Atrazine is for selected crops. The inhibited pathway is in photosystem II. Atrazine is also called as Lasso.
7. What is the pathway of inhibition of Bromoxynil?
a) Photosystem II
b) Photosynthesis
c) Aromatic amino acid biosynthesis
d) Branched chain amino
View Answer
Explanation: The target product of glyphosate is EPSPS and it follows the path of inhibition using aromatic amino acid biosynthesis. Bromoxynil uses selected crops as detoxification for the basis of resistance.
Sanfoundry Global Education & Learning Series – Agricultural Biotechnology
To practice all areas of Agricultural Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
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