Q.11 In an ecosystem mycorrhizae are an example of:
A) Predation C) Mutualism
B) Symbiosis D) Parasitism
Q.12 As a result of destruction of ozone layer there is significant increase in:
A) Ultra-violet radiations C) Nitrogen oxide
B) Greenhouse gases D) Sulphur oxide
Q.13 Higher rate of a biological activity in a nutrient rich pond water is called:
A) Water pollution C) Eutrophication
B) Air pollution D) Industrial effects
Q.14 Living part of ecosystem is:
A) lithosphere C) Community
B) Hydrosphere D) Biosphere
Q.15 A living association between two living organisms of different species which is beneficial to both
the partners is called:
A) Commensalism C) Mutualism
B) Parasitism D) Predation