Which of the following is NOT a characteristic of dicotyledonous plants?

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RRC Group D Previous Paper 5 (Held On: 23 Sep 2018 Shift 1)
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  1. Tap root
  2. Reticulate venation
  3. Two cotyledons
  4. Fibrous roots

Answer (Detailed Solution Below)

Option 4 : Fibrous roots
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Detailed Solution

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  • Fibrous roots are not the characteristic feature of dicotyledonous plants.
  • Dicotyledonous plants are also called knowns are dicot and they are angiosperms (Flowering plants)
  • Its roots develop from the radicle and the seed has two cotyledons or embryonic leaves.
  • Their leaves have reticulate venation and have a pentamerous and tetramerous flower.
  • Examples: mustard, bitter gourd, watermelon, brinjal, apple, mango, tamarind etc.

    Important Points 

    •  Basic differences between monocot and dicot plants are:
    Monocots     Dicots
    Have single cotyledon Have two cotyledons
    Have fibrous root system Have tap root system
    Leaves have parallel venation Leaves have reticulate venation
    Eg wheat, corn, bamboo, and banana  Eg. apples and pear, Congress grass (parthenium)

    Additional Information 

    • Leaf venation is the design made by veins in a leaf
    • If the designs made by the veins of a leaf are parallel to each other, then that is known as parallel venation. For example, maize, grass, wheat, etc.
    • Reticulate Venation is the kind of venation design that is net-like on both sides of the mid-rib. For example, rose, coriander, oak, etc.

     

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