Organisms and Populations Question 12

12. In which one of the following is nitrogen not a constituent?

(a) Pepsin

(b) Idioblast

(c) Bacteriochlorophyll

(d) Invertase

Show Answer

Answer : b

Hints & Solutions

(b) Raphides are needle-shaped crystals of calcium carbonate or calcium oxalate found in specialized plant cells called idioblasts. It is believed that the raphides are a defense mechanism against plant predators, as they are likely to tear the soft tissues of the throat or esophagus of a plant predator chewing on the plant’s leaves. They are non-nitrogenous substances.



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