Chapter 6 - Anatomy of Flowering Plants

Anatomy of Flowering Plants explains the internal organisation of roots, stems and leaves. While morphology studies the externally visible form of a plant, anatomy examines how different tissues are arranged inside each organ and how monocot and dicot plants differ.

Teachoo’s resources for the current NCERT Class 11 Biology Chapter 6 include concept explanations, labelled transverse-section diagrams, NCERT solutions, important questions, MCQs and comparison tables for school examinations and NEET. The goal is to help students identify a plant section from structural clues instead of memorising diagrams mechanically.

The chapter begins with the three major tissue systems:

• Epidermal tissue system

• Ground or fundamental tissue system

• Vascular or conducting tissue system

The epidermal tissue system forms the outer covering of the plant body. It includes epidermal cells, stomata and appendages such as root hairs and trichomes. The cuticle limits water loss, root hairs absorb water and minerals, and stomata regulate gas exchange and transpiration. Students also study guard cells, subsidiary cells and the complete stomatal apparatus.

The ground tissue system includes all tissues other than the epidermis and vascular bundles. Depending on the organ, it may form the cortex, pericycle, pith, medullary rays or photosynthetic mesophyll. The arrangement of ground tissue helps distinguish roots, stems and leaves.

The vascular tissue system consists of xylem and phloem organised into vascular bundles. Bundles may be radial or conjoint. Conjoint bundles may be open when cambium is present or closed when cambium is absent. Students also distinguish exarch xylem in roots from endarch xylem in stems.

The second part of the chapter examines the anatomy of dicot and monocot roots, stems and leaves. Important comparisons include:

• Dicot root versus monocot root

• Dicot stem versus monocot stem

• Dorsiventral leaf versus isobilateral leaf

• Open versus closed vascular bundles

• Endarch versus exarch xylem

• Dorsiventral versus isobilateral leaf organisation

In a dicot root, the pith is small or inconspicuous and xylem bundles are relatively few. A monocot root generally has numerous xylem bundles and a large, well-developed pith. In a dicot stem, vascular bundles occur in a ring and are conjoint, open and endarch. In a monocot stem, vascular bundles are scattered, surrounded by bundle sheaths and closed.

A dorsiventral dicot leaf has distinct palisade and spongy mesophyll, usually with more stomata on the lower epidermis. An isobilateral monocot leaf generally has similar surfaces, undifferentiated mesophyll and bulliform cells that assist leaf rolling during water stress.

Teachoo’s Chapter 6 category helps students prepare labelled transverse sections, identify tissues from descriptions and answer reasoning-based questions. Diagrams are presented with their functional meaning—for example, why palisade tissue occurs near the upper surface of a dorsiventral leaf or why monocot vascular bundles are described as closed.

For revision, first learn the role of each tissue system and then locate it within the organ. Redraw the current NCERT sections and inspect the epidermis, cortex or ground tissue, endodermis, pericycle, vascular tissues, pith and mesophyll in a fixed sequence. This makes plant anatomy predictable and easier to recall.