Questions
1
What is the cause of decrease in the population of birds in an aquatic food chain
Answer:Due to DDT
3
Which of the following is the dominant among greenhouse gases
Answer: Carbon dioxide
4
What are the effects of UB-B radiations on human beings
Answer: All the options
6
Which of the compounds are responsible for accelerated eutrophication
Answer:Both b and c
8
Which one of the following is a wrong statement?
Answer:Greenhouse effect is a natural phenomenon
9
In an area where DDT had been used extensively, the population of birds declined significantly because
Answer:Many of the birds eggs laid, did not hatch
10
Measuring Biochemical Oxygen Demand (BOD) is a method used for
Answer:Estimating the amount of organic matter in sewage water
11
dB is a standard abbreviation used for the quantitative expression of
Answer:A particular pollutant
12
Identify the correctly matched pair
Answer: Kyoto protocol – Climatic change
14
Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of :
Answer: Ca ATPase
16
Industrial melanism is an example of
Answer: Darkening of skin due to industries
17
Carbon dioxide is called green-house gas because it is
Answer: Used in green-house to increase plant growth
18
Trichoderma harzianum has proved a useful microorganism for:
Answer:Biological control of soil-borne plant pathogens
19
The two gases making highest relative contribution to the greenhouse gases are
Answer: CO2 and CH4
20
The slow rate of decomposition of fallen logs in nature is due to their:
Answer: Low cellulose content
