Which of the following flowers cannot be divided into two similar halves by any vertical plane passing through the centre?

Step-by-step solution

According to NCERT, a flower is asymmetric (irregular) if it cannot be divided into two similar halves by any vertical plane passing through the centre. Canna is the classic example of an asymmetric flower. Mustard and Datura exhibit actinomorphic (radial) symmetry, meaning they can be divided into two equal radial halves in any radial plane passing through the centre. Gulmohur exhibits zygomorphic (bilateral) symmetry, meaning it can be divided into two similar halves only in one particular vertical plane. Answer: