Agrochemical And Their Effects Test

Agrochemical And Their Effects

This is online test 02 for CBSE class 12 Biology Environmental Issues (Agrochemical and their effects).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
Increasing skin cancer and high mutation rate are due to
  • A
    CO pollution
  • B
    Acid rain
  • C
    Ozone depletion
    Correct
  • D
    \(C{O_2}\) pollution
2
Aerosols decrease primary productivity by
  • A
    Preventing \({N_2}\) fixation.
  • B
    Reducing photosynthesis.
    Correct
  • C
    Decreasing \({O_2}\)concentration.
  • D
    Competing with \(C{O_2}\)
3
Highest DDT deposition shall occur in
  • A
    Phytoplankton
  • B
    Eel
    Correct
  • C
    Crab
  • D
    Sea bird
4
A lake receiving nutrients would be
  • A
    Rich in fossils
  • B
    Oligotrophic
  • C
    Sink
  • D
    Eutrophic
    Correct
5
Fertilizers added to fresh water will cause
  • A
    Increase in aquatic animals
  • B
    Eutrophication
    Correct
  • C
    Death of plants
  • D
    Decrease in fish population
6
Drawback of DDT s pesticide is
  • A
    It is less effective than others
  • B
    It become less ineffective after some time
  • C
    Its high cost
  • D
    It is not easily or rapidly degraded in nature.
    Correct
7
In coming years, skin related disorders will become more common due to
  • A
    Depletion of ozone layer.
    Correct
  • B
    Air pollution
  • C
    Water pollution
  • D
    Excessive use of detergents
8
Use of Lichen in case of pollution is
  • A
    Treatment of pollutant water.
  • B
    Lichen have no relation with pollution.
  • C
    Promote pollution
  • D
    Bio-indicator of pollution.
    Correct
9
Correct order of concentration of DDT in following organisms are i. Small fish ii. Large fish iii. Phytoplankton iv. Human beings
  • A
    i, ii, iii and iv.
  • B
    iv, ii, i, and iii.
  • C
    ii, iii, iv, and i
  • D
    iii, i, ii and iv.
    Correct
10
Assertion: Agricultural output increased several times after introduction of DDT. Reason: DDT was the first insecticide used on a wide scale.
  • A
    Both are wrong.
  • B
    Assertion is true but reason is wrong.
  • C
    Both are true but reason is reason is not correct explanation.
    Correct
  • D
    Assertion is wrong but reason is true.