Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Late wood has fewer xylary elements with narrow vessels. Reason R: Cambium is less active in winters. In the light of the above statements, choose the correct answer from the options given below:

Step-by-step solution

The activity of cambium is under the control of many physiological and environmental factors. Such activity can be observed in the form of annual rings. In temperate regions, the climatic conditions are not uniform through the year. In the spring, cambium is very active and produces a large number of xylary elements having vessels with wider cavities. The wood formed is called early wood or spring wood. In winter, the cambium is less active and forms fewer xylary elements that have narrow vessels. The wood formed i