Group 1 | Group 2 | ||
(P) | Net primary productivity | (i) | Total amount of produced by autotrophs energy |
(Q) | Gross primary productivity | (ii) | A type of mutualism where one species is benefitted more than the other |
(R) | Net productivity | (iii) | Amount of energy stored by autotrophs after respiration |
(S) | Secondary productivity | (iv) | Unused amount of energy after consumption by heterotrophs |