A. Natural balance of our ecological environment
B. Natural gaseous cycle
C. Natural geochemical cycle
D. Natural flora of a place
Pollution
Pollution
A. They treat the polluted water
B. They act as bio-indicators of pollution
C. They promote pollution
D. Lichens are not related with pollution
A. Sea food containing lot of cadmium
B. Fish contaminated with mercury
C. Oysters with lot of pesticide
D. Sea food contaminated with selenium
A. Mosses
B. Liver worts
C. Lichens
D. Ferns
A. Fishes
B. Birds
C. Zooplanktons
D. Phytoplanktons
A. 20 times
B. 100 times
C. 2 times
D. 200 times
A. Pathogens
B. Pheromones
C. Insect repellant
D. Insect hormone analogue
A. Biogas generation
B. Biological oxygen demand
C. Biosynthetic path way
D. Fermentation
A. O3 layer
B. SO2 layer
C. O2 Layer
D. CO2 layer
A. Cooling of earth
B. Trapping UV rays
C. Production of cereals
D. warming of earth