The present study was based on morphometric study with respect to feeding with respect to their development of life stages of Z. bicolorata. Z. bicolorata has four larval instar which feed on the parthenium leaves for food. Mean length and width of egg was 1.17±0.05 mm and 0.53±0.05 mm, mean length, width and head capsule of 1st instar larva was 1.72±0.12 mm, 0.73±0.15 mm, 0.55±0.04 mm respectively. While the mean length, width and head capsule of 2nd instar larva was 2.64±0.17 mm, 1.09±0.16 mm, 0.76±0.04 mm. Whereas, the mean length, width and head capsule 4th instar larva was 6.38±0.20 mm, 2.48±0.18 mm, 1.45±0.08 mm, 4th instar larva undergo pupa stage in the soil and its measurement 6.35±0.38 mm length, 3.23±0.16 mm width recorded. In pupa stage head capsule not clearly differentiate. Adult and male 6.44±0.22 mm length, 3.32±0.24 mm width, and 1.62±0.07 mm width. while female was large than male as 7.85±0.25mm length, 3.36±0.32 mm width, 1.80±0.05 mm head capsule width was recorded. The all-body parameters of the beetle increased with respect to increasing food at every stage of life.