Q1
The vascular bundles in monocot stems are described as closed because:
📝 SolutionMonocot vascular bundles lack cambium between xylem and phloem, so they are termed 'closed' and cannot produce secondary tissues.
Q2
The outermost layer of a dicot root, responsible for absorption, often bears:
📝 SolutionThe epidermis (piliferous layer) of a root produces unicellular root hairs that greatly increase the surface area for water and mineral absorption.
Q3
In a typical dicot root, the xylem is:
📝 SolutionIn roots, xylem is exarch, meaning the protoxylem lies towards the periphery and metaxylem towards the centre — opposite to the arrangement in stems.
Q4
A key anatomical difference between a dicot root and a monocot root is that monocot roots typically have:
📝 SolutionMonocot roots usually show a polyarch xylem arrangement (more than six groups) and a well-developed pith, with no vascular cambium, so they lack secondary growth.
Q5
Stomata in a dicot leaf are typically more numerous on the:
📝 SolutionIn a typical dorsiventral (dicot) leaf, stomata are more numerous on the lower epidermis to reduce water loss from the sun-exposed upper surface.
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Class 11 · Biology
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