Biology Questions and Answers
hydrogen sulfide that makes water
improper to other living bcreates a putrid smell. eings and
- What is a biodigester?
A biodigester is equipment that
produces carbsulfide and fuel gases (biogases) likeon dioxide, hydrogen (^)
methane from organic material under
decomposition (dcane waste, etc.). Tung, food waste, sugarhe biogas is used in
heating, as energy for motors and
machinuses. Biodigesters are widely ues and it even has industrialsed in (^)
public waste depositories and in rural
areas. Besides porganic waste can roducing be turned into gbiogas theood (^)
quality fertilizer.
- What are the environmental
harms caused by mercury
pollution? What are the main
sources of mercury pollution?
Mercury the water is a metal that whof rivers, lakes anen present ind seas
contaminatesmolluscs and other livin fishes, crustaceans,g beings. The (^)
mercury accumulates along the food
chain and in each followinthe amount of the metal within g trophic levelthe
individuals is higher. When humans eat
contaminated acontaminated animalsnd severe nervous they also become
system injuries may emerge. The main
sources of mercury mining and the use of derivedpollution ar e gold
substances in industry and agriculture.
- Besides mercury which
other heavy metals cause
toxic pollution?
Examples ocause toxic pollution f other heavy mare lead, cadmiumetals that (^)
and chromium.
- What are persistent
organic pollutants (POPs?
POPs, or are toxic substances fpersistent organic pollutants,ormed from
organic compounds. POPs are made in
several industrialproduction of PVC, pa processes, like per whitened bythe (^)
chlorine, herbicides, insecticides and
fungicides, aof waste. Examples ond also in the incinf POPs are erationdioxins, (^)
furanes, chlorheptachloride, toxaphdane, DDT, dieldrin,en and
hexachlorbenzene.
POPs are like the heavy toxic and highly harmmetals, they are ful since,
bioaccumulative, i.e., degraded by the body and accumulatethey are not (^)
even more in each following trophic
level of the food chains. InPOPs can cause cancer and nervous, humans (^)
immune and reproductive impairments.
- Is the upward move of
warm air good or bad for the
dispersion of pollutants?
The upward movement of warm air is a
natural method of dispersiopollutants. The air near the ground isn of (^)
hotter because the sun heats the soil
and the soil heats the air nearby. Since
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