Greenhouse gases……
a) burn to add heat
b) trap heat
c) help heat to escape
d) do not allow heat to reach earth surface
The interaction in which both members get benefit from each other is……..
a) mutualism
b) predation
c) commensalism
d) competition
The organism that kills the other for food is called……
a) prey
b) parasite
c) pathogen
d) predator
Rhizobium is a group of bacteria which live in the roots of some plants. They fix nitrogen for plant and get food in return. This relationship is
a) parasitism
b) commensalism
c) mutualism
d) competition
In a food chain, which type of organisms utilizes most of the sun energy coming to earth?
a) primary consumers
b) producers
c) secondary consumers
d) tertiary consumers
In an ecosystem, the energy flow is always…..
a) bidirectional
b) random
c) down in pyramid
d) unidirectional
