Class 11 Biology - TAMILNADU
Morphology of Flowering Plants
The chapter Morphology of Flowering Plants in Class 11 Biology under the Tamil Nadu Samacheer Kalvi syllabus explores the external structures of angiosperms. Students study the modification and organization of plant parts including roots, stems, leaves, flowers, inflorescence, fruits, and seeds. Understanding these morphological features is essential for plant taxonomy, identification, and agricultural applications. In board exams, this chapter is a high-scoring section featuring descriptive questions on plant families, floral diagrams, and structural adaptations.
Start Learning FreeKey Concepts
Root System
The underground part of the plant originating from the radicle, comprising tap root and adventitious root systems with modifications for storage and support.
Stem Modification
Stems adapt to perform functions other than conduction, such as food storage in tubers, protection through thorns, and vegetative propagation through runners.
Phyllotaxy
The pattern of arrangement of leaves on the stem axis, categorized into alternate, opposite, and whorled types to ensure maximum light exposure.
Inflorescence
The arrangement of flowers on the floral axis, broadly divided into racemose (indefinite growth) and cymose (definite growth) types.
Floral Formula and Diagram
A symbolic representation using standard letters and numbers to denote floral parts (calyx, corolla, androecium, gynoecium) and their symmetry.
Important Formulas
Board Exam Info
In the Tamil Nadu Samacheer Kalvi Class 11 Biology board examination, this chapter typically carries around 8 to 12 marks. Questions frequently include 1-mark objective questions, 2-mark and 3-mark definitions of modifications, and 5-mark detailed questions involving floral formulas, diagrams, and economic importance of plant families.
Frequently Asked Questions
What is the difference between racemose and cymose inflorescence?
In racemose inflorescence, the main axis continues to grow indefinitely and flowers are borne in an acropetal succession. In cymose inflorescence, the main axis terminates in a flower, stops growing, and flowers are borne in a basipetal succession.
How do we draw a floral diagram from a floral formula?
A floral diagram represents floral structures in cross-section. The mother axis is placed at the top, followed by outer whorls (calyx and corolla) and inner whorls (androecium and gynoecium) arranged according to the numbers and fusion indicated in the floral formula.
What are adventitious roots?
Roots that develop from any part of the plant other than the radicle (such as stems or leaves) are known as adventitious roots, commonly seen in grass, banyan trees, and maize.
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