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Mcqs MBBS Exams India
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Home >> Exams >> UPSC-CMS >> UPSC CMS 2013 >> UPSC CMS 2013 Paper 1 >> Mcqs Page 3
(Single Best Answer) Question 21: Consider the following:

1. Ethylene dibromide

2. Potassium meta-bisulphate

3. Sodium benzoate

Which of the above is / are used as food preservatives ?
A) 1 and 2 only
B) 3 only
C) 2 and 3 only
D) 1, 2 and 3
Answer (Select an option above to get the answer):
(Single Best Answer) Question 22: Which one of the following is an appropriate description of mangrove plants ?
A) Large wood-yielding trees of the tropical forests
B) Plants in marshy areas with breathing roots
C) Succulent plants that can thrive in arid / desert areas
D) Vast grassland areas interspersed with deciduous trees and thorny bushes
Answer (Select an option above to get the answer):
(Single Best Answer) Question 23: Tissue culture technique can be used for

1. developing virus - free plants

2. multiplication of elite genotypes of useful trees

3. production of secondary metabolites of plants

Select the correct answer using the code given below:
A) 1 only
B) 2 and 3 only
C) 1 and 3 only
D) 1, 2 and 3
Answer (Select an option above to get the answer):
(Single Best Answer) Question 24: Which group of algae can provide nitrogenous nutrients to paddy cultivation under natural field conditions ?
A) Blue-green algae
B) Brown algae
C) Green algae
D) Red algae
Answer (Select an option above to get the answer):
(Single Best Answer) Question 25: Bacillus thuringiensis is used to control ?
A) bacterial pathogens
B) fungal pathogens
C) insect pests
D) nematodes
Answer (Select an option above to get the answer):
(Single Best Answer) Question 26: Greenhouse gases are called as such because they ?
A) are used in warming plant growth chambers
B) help in maintaining atmospheric O2 and CO2 balance
C) are produced by green photosynthesizing plants and are trapped in the Earths atmosphere
D) prevent the escape of heat waves reradiated from the Earths surface
Answer (Select an option above to get the answer):
(Single Best Answer) Question 27: The chemical substance Taxol is said to have curative value for malignant tumors. It is obtained from the ?
A) shoots of Taxodium sp.
B) roots and fruits of Taxodium sp.
C) bark from stems of Taxus sp.
D) roots of Taxus sp.
Answer (Select an option above to get the answer):
(Single Best Answer) Question 28: In the hills, the soil erosion takes place due to paid flow of rain water. It can be most effectively controlled by ?
A) building dykes
B) channelizing the water
C) jhum cultivation
D) terrace cultivation
Answer (Select an option above to get the answer):
(Single Best Answer) Question 29: Polymerase Chain Reaction technique is used for ?
A) DNA amplification
B) DNA sequencing
C) screening gene libraries
D) synthesis of polymerases
Answer (Select an option above to get the answer):
(Single Best Answer) Question 30: Some antibiotics act as ionophores, which means that they ?
A) interfere directly with bacterial cell wall synthesis
B) increase cell membrane permeability to specific ions
C) inhibit both transcription and translation
D) inhibit electrophoretic separation of ions
Answer (Select an option above to get the answer):