A) material used for healing of injuries in phloem
B) an undifferentiated mass of cells
C) secondary tissue developed by woody plants over a wound
D) all of the above
Correct Answer: D
Solution :
Botanically callus is the tissue developed in woody plants usually through cambial activity in response to wounding, protecting the injured surface. It is an undifferentiated mass of cells. Zoologically callus is fibrocartilage produced as bone fracture.
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