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Class 11tlh 05. MORPHOLOGY OF FLOWERING PLANTS -ANMOL SHARMA
TARGETED STUDENTS? AlIMS NEET JIPMER CBSE BOARD EXAM . CET(COMMON ENTRANCE TEST) CLASS 11TH & CLASS 12TH
WHAT TO STUDY? . Roots . Region of Roots .Modifications of Roots . Stem Modification of Stem . Leaf Venation Types of Leaves Phyllotaxy Modification of Leaves
. Inflorescence Flower . Parts of Flower(Calyx, Corolla, Androecium & Gynoecium) * Aestivation . Fruits . Seed . Structure of a Dicotyledonous Seed . Structure of a Monocotyledonous Seed . Floral Formula
Introduction Angiosperms are characterized by presence of roots, stems, leaves, flowers and fruits. The underground part of the flowering plant is the root system while the portion above the ground forms the shoot system The Angiosperms show a large diversity in External structure or Morphology
Flower Fruit Stem Leaf Shoot system Node Internode Buxd Primary root Root Secondary system root Fig: Structure of typical plant Source :- This image is from NCERT Textbook Page no. 66
THE ROOT . Roots are developed from Radicle of the embryo of a germinating seed. (NEET/AIPMT) . In majority of the dicotyledonous plants, the direct elongation of the radicle leads to the formation of primary root which grows inside the soil. It bears lateral roots of several orders that are referred to as secondary, tertiary, etc. roots. The primary roots and its branches constitute the tap root system e.g., mustard plant.
. In monocotyledonous plants, the primary root is short lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system e.g., wheat plant.(NEET/PMT) . In some plants, like grass, Monstera and the banyan tree, roots arise from parts of the plant other than the radicle and are called adventitious roots.
The main functions of the root system are - . Absorption of water and minerals from the soil . providing a proper anchorage to the plant parts, storing reserve food material and . synthesis of plant growth regulators.
Main root Fibrous roots Adventitdous roots (aj Fig: Different types of roots: (a) Tap (b) Fibrous (c) Adventitious. Source :- This image is from NCERT Textbook Page no. 66