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Ans: (d) cambium is absent.
Explanation: In monocots there is no secondary growth so, no need of vascular cambium. Vascular cambium is absent so monocot have closed vasculature.
Cytochromes are found in (a) cristae of mitochondria (b) lysosomes (c) matrix of mitochondria (d) outer wall of mitochondria.
A major characteristic of monocot root is the presence of (a) vasculature without cambium (b) cambium sandwiched between phloem and xylem along the radius (c) open vascular bundles (d) scattered vascular bundles.