AIIMS 2019 Botany Secondary Growth Assertion Reason Question

Option B is correct because the assertion that bamboo lacks vascular cambium and thus does not show secondary growth is true, but the reason provided is not a valid explanation for the absence of annual rings. Bamboo, being a monocot, does not produce secondary xylem or phloem, which are responsible for the formation of annual rings in dicots. Therefore, while the statement about bamboo is accurate, it does not logically explain the absence of annual rings, as the lack of vascular cambium is a characteristic of its growth pattern rather than a direct cause of ring formation. Options A, C, and D are incorrect as they either affirm the flawed reasoning or do not address the assertion adequately.