A timber merchant told to the customer that log of wood he is purchasing belongs to $20$ years old tree. He did so by
Measuring wood log
Counting annual rings
Counting cork layers
Measuring breadth of wood
Intercalary meristem is a derivative of
The length of different internodes in a culm of sugarcane is variable because of
Aerenchyma is found in
Phloem parenchyma is absent in