If tree crops are planted at a spacing of 2.5 m × 2.0 m, the number of trees per hectare is

Correct option is C

Area of one hectare = 10,000 m².
Area occupied by one tree = 2.5 × 2.0 = 5 m².
Number of trees = 10,000 ÷ 5.
This gives 2000 trees per hectare.
Spacing directly affects plant population.
Hence option (c) is correct.