Previous year MCQs

General science UPPSC 2017 GS-I
Question

Which one of the following is not correctly matched? Nitrogen fixing agent – Crop

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Azolla – Maize

Detailed Solution:

The correct answer is “Azolla – Maize”.
Azolla is a water fern that forms a symbiotic relationship with the nitrogen-fixing cyanobacterium Anabaena azollae. This association is commonly used in rice cultivation (Paddy) to enhance nitrogen availability in the soil. It is not typically used with maize.
Organism Crop
Blue green algae Paddy
Rhizobium Leguminisarum Pea
Azotobacter Wheat
Azolla Paddy

Similar Questions:

The atoms, in which the number of protons is same but the number of neutrons is different, are known as:
  1. A) Isotopes
  2. B) Isobars
  3. C) Isomers
  4. D) Isotones
Match List I with List II and select the correct answer using the code given below:
List I [Waterfall] List II [River]

(A) Dudhsagar - (a) Ghatprabha
(B) Duduma - (b) Machhkund
(C) Gokak -(c) Sharavati
(D) Jog - (d) Mandavi
  1. A) A-d, B-b, C-a, D-c
  2. B) A-d, B-b, C-c, D-a
  3. C) A-b, B-d, C-a, D-c
  4. D) A-b, B-c, C-d, D-a
When water is filled in a bottle and allowed to freeze, the bottle breaks because:
  1. A) Water expands on freezing
  2. B) Bottle contracts at freezing point
  3. C) Temperature outside the bottle is more than inside
  4. D) Water expands on heating
The full form of SIM is:
  1. A) Subscriber’s Identity Module
  2. B) Subscriber’s Identity Machine
  3. C) Self Identity Machine
  4. D) Self Identity Module
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  2. B) Hemp
  3. C) Jute
  4. D) Cotton
Which of the following statements about enzymes is/are correct?

1. They are biocatalysts.
2. They perform their action on the site where they are produced.

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Codes:
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  2. B) 2 only
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  4. D) Neither 1 nor 2
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  1. A) Lead
  2. B) Aluminium
  3. C) Zinc
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  1. A) Lemon
  2. B) Sun rays
  3. C) Orange
  4. D) Cashew nut
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  1. A) Magnetic Record of Intestines
  2. B) Magnetic Recording of Investigations
  3. C) Magnetic Resonance Imaging
  4. D) Magnetic Resonance in Intestines
Expansion during heating
  1. A) Occurs only in solid
  2. B) Increases the weight of the material
  3. C) Decreases the density of the material
  4. D) Occurs at the same rate for all liquids and solids
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  1. A) Neutrons
  2. B) Protons
  3. C) Atoms
  4. D) Ions
The 'xylem' in plants is responsible mainly for:
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  2. B) Transportation of amino acid
  3. C) Transportation of water
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