HardBiologyHigh School (11–12)Tissues and Organs › Anatomy of Flowering PlantsConceptualA-Level IB NEET

Neha studies bundles on three slides. Slide P is from a young stem: a strip of cells that can…

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Neha studies bundles on three slides. Slide P is from a young stem: a strip of cells that can divide lies between the xylem and the phloem, and the phloem is only on the outer side. Slide Q is from a grass stem: there is no such strip. Slide R is from a root: the xylem and the phloem are in separate patches, and the first-formed vessels are at the outer edge. (a) Is the bundle on slide P open or closed, and which class of plant is it from? (b) Is slide Q open or closed? (c) What are the bundle arrangement and the xylem type on slide R?

Need a reminder? The key ideaShow

Epidermal tissue system: epidermis with cuticle (cutin, absent in roots), stomata (bean-shaped guard cells in dicots, dumb-bell in grasses; thick inner wall, thin outer wall; subsidiary cells; the stomatal apparatus), root hairs (unicellular) and trichomes (multicellular, on stems). Ground tissue system: all but epidermis and vascular bundles; cortex, pericycle, medullary rays, pith; mesophyll in leaves. Vascular tissue system: xylem and phloem; open bundles (cambium, dicot stem) and closed (monocot stem); conjoint (stems, leaves) and radial (roots); collateral and bicollateral; endarch xylem in stems, exarch in roots.

The worked solution

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