Question57:-An association between two individuals or population in which both are benefited and where neither can
survive without the other
A:-commensalisms
B:-mutualism
C:-co-operation
D:-competition
Correct Answer:- Option-B
Question58:-Biofilms are
A:-films about biclogy
B:-masses of biclogical materials attached to wet walls
C:-masses of cells and extracellular materials attached to surfaces bathed in liquids
D:-collections of cells and extracellular materials attached to dry walls
Correct Answer:- Option-C

Question59:-Elements that cycle in the environment and that also have a gaseous phase at some point in the cycle include
the following

A:-carbon
B:-carbon and sulphur
C:-carbon and phospherous
D:-carbon, phospherous and sulphur
Correct Answer:- Option-B
Question60:-Which of the following techniques can be used to estimate the number of microbes in a natural sample 7
A:-Enrichment culture
B:-Extinction culture technique
C:-Microdroplet culture
D:-Most Probable Number (MPN}
Correct Answer:- Option-D
Question61:-Which of the following environments has the greatest percentage of culturable microbes 7
A:-saline water
B:-fresh water
C:-activated sludge
D:-soil
Correct Answer:- Option-C
Question62:-Black soils are commonly found in
A:-Rajasthan
B:-Maharashtra
C:-Odisha
D:-Himalayan region
Correct Answer:- Option-B
Question63:-What are the Khetri mines in India famous for 7
A:-Coal
B:-Copper
‏نت‎
‎D:-Gold
‎Correct Answer:- Option-B
Question64:-Which State in India is the largest produce of mica mineral 7
A:-Andhra Pradesh
B:-Karnataka
C:-Madhya Pradesh
D:-Odisha
Correct Answer:- Option-A
Question65:-The Monazite sands of Kerala beach are rich in
A:-Radium
B:-Uranium
C:-Platinum
D:-Thorium
Correct Answer:- Option-D
Question66:-Which species of fauna are found in an area separated by natural or geographic barriers ?
A:-Rare
B:-Extinct