How to prove that the bulb is a modified shoot?

Bulbs of bulbous plants are modified shoots, have all the characteristics of shoots and give rise to new plants. The bulb has a flattened stem (bottom), leaves in the form of scales and buds growing from the bottom. Adventitious roots can grow from the bottom. The inner thick leaves-scales store water and nutrients.
The best evidence that a bulb is a shoot is to observe the appearance of green arrows from a partially submerged onion bulb.



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