Environmental Science
Which of the following statements regarding species interdependence are true? A. An association of two species where one is benefitted and other remains unaffected called mutualism B. An interspecific association where both partners derive benefit from each other is called commensalism C. A direct food relation between two species of animals in which one animals kills and feed on another is referred as predation D. A relationship between two species of organism where both the partners are benefitted from each other is called symbiosis

B and C only
C and D only
B and D only
A and C only
A and B only

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Environmental Science
Which of the following regarding ecological pyramids is not correct?

In deep water ecosystem, the pyramid of biomass is upright
The total energy flow at successive tropical level always decreases
In tree dominated ecosystem the pyramid of numbers is inverted
The pyramid of energy expresses mainly the rate of food production
In most ecosystems, the pyramid of numbers and biomass are up right

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