Class 11 Biology - WEST-BENGAL
Morphology of Flowering Plants
The chapter 'Morphology of Flowering Plants' in Class 11 Biology under the West Bengal Board (WBBSE) explores the external structural features of angiosperms. Students study the root, stem, leaf, inflorescence, flower, fruit, and seed. Understanding these structural variations is vital for identifying plant families, which is a major focus in WBBSE board examinations. Mastery of floral diagrams and floral formulas enables students to score high marks in practical and theoretical evaluations, forming the foundation of plant taxonomy.
Start Learning FreeKey Concepts
Root System
The underground part of the plant responsible for anchorage and absorption of water and minerals, categorized into taproot, fibrous, and adventitious root systems.
Stem and Modification
The aerial axis of the plant that bears leaves, flowers, and fruits, which can undergo modifications like runners, tubers, and thorns for storage, support, and protection.
Venation and Phyllotaxy
Venation refers to the arrangement of veins in the lamina (reticulate or parallel), while phyllotaxy is the pattern of arrangement of leaves on the stem (alternate, opposite, or whorled).
Inflorescence
The mode of arrangement of flowers on the floral axis, broadly divided into racemose (indefinite growth) and cymose (definite growth) types.
Floral Formula and Floral Diagram
Standardized symbolic representations using letters and numbers to denote floral parts (calyx, corolla, androecium, gynoecium) and their symmetry, sexuality, and cohesion.
Important Formulas
Board Exam Info
In the West Bengal Council of Higher Secondary Education (WBCHSE) Class 11 Biology exam, this chapter typically carries around 6 to 8 marks. Questions frequently include drawing floral diagrams, writing floral formulas of specific families like Fabaceae and Solanaceae, differentiating between types of inflorescence or venation, and short answer questions.
Frequently Asked Questions
What is the difference between racemose and cymose inflorescence?
In racemose inflorescence, the main axis continues to grow and flowers are borne laterally in an acropetal succession. In cymose inflorescence, the main axis terminates in a flower, limiting its growth, and flowers are borne in a basipetal order.
How do I write a floral formula correctly?
Follow the standard sequence: sexuality (K or ♂/♀), symmetry (⊕ or %), calyx (K), corolla (C), perianth (P if present), androecium (A), and gynoecium (G) along with numbers indicating the count of parts and fusion/adhesion using brackets.
What are adventitious roots?
Roots that arise from parts of the plant other than the radicle (such as stems or leaves), commonly seen in grass, Monstera, and banyan trees.
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