PREVIOUS YEAR QUESTIONS (PRELIMS)
Q.1 ) What would happen if phytoplankton of an ocean is completely destroyed for some reason? (UPSC/2012)
- The ocean as a carbon sink would be adversely affected.
- The food chains in the ocean would be adversely affected.
- The density of ocean water would drastically decrease.
Select the correct answer using the codes given below:
- 1 and 2 only
- 2 only
- 3 only
- 1, 2 and 3
Answer: A
Q.2) ‘Kelp’ is: (SSC)
- Sulphide mineral of iron
- Partially decomposed vegetation
- Sea weed rich in iodine content
- An aluminum silicate mineral
Answer: C
IAS/2000
Q.3) Which one of the following organisms can serve as a biofertiliser for rice crop? (UPSC/2000)
- Blue-green algae
- Rhizobium sp
- Mycorrhizal fungi
- Azotobacter sp
Answer: A
Q.4 ) Which of the following weeds has been found useful to check water pollution caused by industrial affluents?
- Parthenium
- Elephant grass
- Water hyacinth
- Both (a) and (b) above
Answer: C
Q.5 ) Sargasso Sea is characterized by (CDS-II/2012)
- very cold water
- very warm water
- highly saline water
- typical marine vegetation
Answer: D