The question asks to identify the incorrect statement regarding Bonne's Projection. Let's analyze each option:
In Bonne's Projection, the parallels of latitude are represented as concentric arcs of circles. The central parallel is the arc with the largest radius. This statement is correct.
The central meridian in Bonne's Projection is a straight line, and the scale along this meridian is correct (true). This statement is correct.
Bonne's Projection is fundamentally an equal-area (or equivalent) projection, meaning it preserves area but distorts shapes and angles, especially away from the central meridian and parallel. An orthomorphic (or conformal) projection, conversely, preserves angles. Therefore, stating that Bonne's Projection is orthomorphic is incorrect.
Bonne's Projection is suitable for mapping continents or large countries where preserving area is crucial. Its use for regions like France and India, which have significant latitudinal extent, is appropriate. This statement is correct.
Based on the analysis, the incorrect statement about Bonne's Projection is that it is an orthomorphic projection.