NCERT Solutions for Class 11 Biology Chapter 5

NCERT Solutions for Class 11 Biology Chapter 5 Morphology of Flowering Plants to Study online and PDF form to download Free. NCERT Solutions of other subjects are also available to free download.


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Morphology of Flowering Plants: Solutions




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NCERT Solutions for Class 11 Biology Chapter 5 Morphology of Flowering Plants
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Important Terms on  Morphology of Flowering Plants

  • The Root: The root is underground part of the plant and develops from elongation of radicle of t he embryo.
Main functions of root system
  1. Absorption of water and minerals from the soil.
  2. Provides anchorage to plant parts.
  3. Stores reserve food material and synthesises plant growth regulators (cytokinins).



Regions of Roots
  • Root Cap: The root is covered at the apex by the thimble-like structure which protect the tender apical part.
  • Region of meristematic activity: Cells of this region have the capability to divide; cells are small, thin walled with dense protoplasm.
  • Region of elongation: Cell of this region are elongated and enlarged. This region is responsible for the growth of root in length.
  • Region of Maturation: This region has differnentiated and matured cells.
    Some epidermal cells form very fine and delicate thread like structures called root hairs.
  • Modifications of Root: Roots are modified for support, storage of food, respiration.




Modifications of Stem
  • In some plants the stems are modified to perform the function of storage of food, support, protection and vegetative propagation.
  • For food storage: Rhizome (ginger, turmeric), Tuber (potato), Bulb (onion), Corm (Colocasia, Amorphophallus/Zamin-kand)
  • For support: Stem tendrils of wawtermelon, grapevine, cucumber, pumpkins.
  • For protection: Axilliary buds of stem of Citrus, Bougainvillea get modified into pointed thorns. They protect the plants from animals.
  • For vegetative propagation: Underground stems of grass (runner), strawberry (stolons), leateral branches of mint and jasmine, Eichhornia (offsets).
  • For assimilation of food: Flattened stem of Opuntia and cylindrical stem of Euphorbia contains chlorophyll and performs photosynthesis.



Types of aestivation
  1. Valvate: Sepals or petals just touch one another at the margin, without overlapping. e.g., Calotropis
  2. Twisted: Sepals or petals overlap the next sepal or petal e.g., China rose, Cotton, lady’s finger.
  3. Imbricate: The margins of sepals or petals overlap one another but not in any definite direction, e.g., Cassia, Gulmohar.
  4. Vexillary: The largest petal overlaps the two lateral petals which in turn overlap two smallest anterior petals, e.g., Bean, Pea.