Identify the error in the underlined parts: (a) Meaningful ecological (b) affects of the handloom (c) sector can be optimized (d) through recycling practices.

The word 'affects' is a verb meaning 'to influence'. The correct word here is 'effects' (a noun meaning 'results' or 'consequences'). The sentence intends to refer to the ecological effects (impact/results) of the handloom sector. Therefore, the error is in part (b), which should be 'effects of the handloom'.