Discussion

Match the types of ecological energy productivity in Group 1 with their respective definitions in Group 2.

Group 1	Group 2
(P) Net primary productivity	(i) Total amount of energy produced by autotrophs
(Q) Gross primary productivity	(ii) Amount of energy stored by autotrophs after respiration
(R) Net productivity	(iii) Net gain of energy by the consumers after energy loss
(S) Secondary productivity	(iv) Unused amount of energy after consumption by heterotrophs

Answer: C

The correct match is P-ii, Q-i, R-iv, S-iii.

Gross primary productivity is the total energy fixed by autotrophs.
Net primary productivity is what the autotrophs store after their own respiration.
Net (community) productivity is the energy left unused after heterotrophs have consumed their share.
Secondary productivity is the energy gained by consumers, net of their losses.

The option P-ii, Q-i, R-iii, S-iv swaps the last two definitions, and the others confuse gross and net primary productivity.

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