A) secondary xylem and secondary phloem
B) primary xylem and primary phloem
C) secondary xylem only
D) primary phloem and secondary xylem
Correct Answer: C
Solution :
The annual rings are formed by secondary xylem because the growth in spring and autumn seasons forms spring and autumn wood which constitute the annual rings by which age of plant can be estimated.You need to login to perform this action.
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