Simple way for IAS preparation

Tuesday, August 27, 2019

Environment-ecology-Prelims booster quiz day-05

1.Biological Oxygen Demand (BOD) is a standard criterion for

(a) Measuring oxygen levels in blood
(b) Computing oxygen levels in forest ecosystems
(c) Pollution assay in aquatic ecosystems
(d) Assessing oxygen levels in high altitude regions

2.With reference to bio-toilets used by the Indian Railways, consider the following statements:
1. The decomposition of human waste in the bio-toilets in initiated by a fungal inoculum.
2.Ammonia and water vapour are the only end products in this decomposition which are released into the atmosphere.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

3.Which one of the following is the best description of the term 'ecosystem'?
(a) A community of organisms interacting with one another
(b) That part of the Earth which is inhabited by living organisms
(c) A community of organisms together with the environment in which they live
(d) The flora and fauna of a geographical area.

4.Lichens, which are capable of initiating ecolological succession even on a bare rock, are actually a symbiotic association of
(a) algae and bacteria
(b) algae and fungi
(c) bacteria and fungi
(d) fungi and mosses

5.With reference to Neem tree, consider the following statements :
1.Neem oil can be used as a pesticide to control the proliferation of some species of insects and mites.
2.Neem seeds are used in the manufacture of biofuels and hospital
3. Neem oil has applications in pharmaceutical industry.
Which of the statements given above is/are correct ?
(a) 1 and 2 only
(b) 3 only
(c) 1 and 3 only
(d) 1, 2 and 3