NCERT NEET Environmental Issues PDFs.MCQs,mock,model,sample test

Environmental Issues Mock Test-3

Question No:1

What happens to sewage water from the point of sewage discharge?

[A] Dissolved oxygen ↓eses
[B] Mortality of fish ↑eses
[C] Biological oxygen demand ↑eses
[D] All of the above



Question No:2

World’s most problematic aquatic weed is

[A] Terror of Bengal
[B] Water hyacinth
[C] Eichhornia crassipes
[D] All of the above



Question No:3

Water hyacinth is introduced in India for

[A] High growth rate
[B] Beautiful flowers
[C] Disease resistance gene
[D] All of the above



Question No:4

The presence of large amount of nutrients in water causes excessive growth of planktonic (free-floating) algae, called. This is called

[A] Red tide
[B] Bio-magnification
[C] Algal bloom
[D] Biofortification



Question No:5

Which of these diseases is/are caused by contaminated water?

[A] Dysentery
[B] Typhoid, jaundice
[C] Cholera
[D] All of the above



Question No:6

Heavy metal in waste water comes from:

[A] Petroleum industries
[B] Paper manufacturing industries
[C] Metal extraction industries
[D] All of the above



Question No:7

Which of the following are heavy metals (density > gm/cc)?

[A] Hg, Cd
[B] Cu
[C] Pb
[D] All of these



Question No:8

Increase in concentration of the toxic substances at successive trophic levels is known as:

[A] Bio-fortification
[B] Bio-war
[C] Bio-informatics
[D] Bio-magnification



Question No:9

The phenomena of bio magnification in aquatic ecosystem is well-known for the rising presence of:

[A] Hg
[B] DOT
[C] Both (a) and (b)
[D] None of these



Question No:10

If the water contains 0ppb of DDT then fish eating birds contain what level of DDT?

[A] 0.04ppm
[B] 2 ppm
[C] 0.5 ppm
[D] 25 ppm



Question No:11

High concentration of DDT causes decline in:

[A] Fish population
[B] 200 plankton population
[C] Small fish population
[D] Bird population



Question No:12

Which of these is/are true about DDT?

[A] Undergo biomagnifications in aquatic ecosystem
[B] Disturb calcium metabolism in bird
[C] Causes thinning of eggshell leads to premature breaking
[D] All of the above



Question No:13

Natural aging of lake by nutrient enrichment of its water is:

[A] Bio-fortification
[B] Bio-magnification
[C] Bio-geochemical cycle
[D] Eutrophication



Question No:14

Eutrophication occurs because of:

[A] Ca and Mg
[B] Nitrogen and phosphorous
[C] Carbon and oxygen
[D] Hg and DDT



Question No:15

Natural aging of lake depends on:

[A] Climatic factors
[B] Size of lake
[C] Nutrient content of lake
[D] All of the above