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Question

Plants growing at the equator are characterized by the absence of _______________.

A
Secondary growth
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B
Heart and sap wood
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C
Annual rings
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D
Soft wood
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Solution

The correct option is C Annual rings
The correct answer is C.
The formation of annual rings is directly related to the seasonal differences in the activity of cambium. In equatorial region the climatic conditions are almost uniform through out the year. So there is no difference in the activity of cambium. Hence the secondary wood is not differentiated into spring and autumn wood. So no annual rings are formed.

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