Iodine is a chemical element with symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas. The elemental form was discovered by the French chemist Bernard Courtois in 1811.
Definition of CHOLLA. : any of numerous shrubby opuntias chiefly of the southwestern United States and Mexico that have needlelike spines partly enclosed in a papery sheath and cylindrical joints âcalled also cholla cactus.
Generally, a cactus has 22 chromosomes arranged as 11 pairs. Such a cactus is called 'diploid', from the Greek 'diploos' and 'eidos' for 'double' and 'form', respectively. In the way of comparison, humans tend to have 46 chromosomes arranged as 23 pairs. But some cactus plants have more than two sets of chromosomes. For example, it's possible for a cactus to have 44 or even 66 chromosomes. Such a cactus is called 'polyploid', from the Greek 'polu' and 'ploos' for 'many' and 'fold', respectively.