The Northern Boundary of the Wild Madder Plant Corresponds to the ________

Question

The northern boundary of the wild madder plant corresponds to the ________ January isotherm.
A) -4°C
B) 4.5°C
C) 10°C
D) 15°C
E) 20°C

Accepted Answer

The northern boundary of the wild madder plant corresponds to the 4.5°C January isotherm, indicating that this temperature threshold is critical for its survival and growth during the coldest month.