It is the stalk of the plant
A. chemicals, the constriction of the pupil are usually caused by opiates anti-hypertension drugs.
It would be: Rr × Rr
Result of cross would be: 1RR, 2Rr, 1rr
So, it's genotypic ratio = 1:2:1
Phenotypic ratio = 3:1
Hope this helps!