Free Biology Dictionary

Video Example : Carnivores

Petiole

RELATED WORDS

  • Sepals
  • Tepals
  • Corolla
  • Zygomorphic flower
  • Actinomorphic flower

Definition of Petiole

Part of the leaf that is attached to the plant stem or branches
Example: Leaves of Rose, Violet, Sunflower, Basal.

More About Petiole

  • The petiole gets its name from “little foot’
  • It is also referred to as ‘leaf stalk’
  • Modified petioles are known as ‘phyllodes’
  • Petioles attach the leaf blade to the stem
  • It directs the leaf from the branch to gets sufficient sunlight for photosynthesis
  • The structure and length of the petiole may differ from plant to plant
  • Small outgrowths appearing on either side of petiole are called ‘stipules’
  • Any change in the petiole is detected, it shows the sign of disease or infection of the plant
  • Leaves may or may not be bear petioles
  • The number of Petiole is important characteristics for the plant classification.
  • If all the Petiole are similar in the size and shape, the flower is known as regular or actinomorphic flower.
  • If the flowers are symmetrical in only one plane, then they are said to be irregular or zygomorphic.
  • In some plants the sepals and the Petiole of the flowers cannot be distinguished as they have the same colour and shape. For example Tulips.
  • Such flowers are known to have tepals, instead of sepals and Petiole.
  • The leaves that have petiole are called as ‘Petiolate leaves’, whereas the ones lacking petiole are termed as ‘Sessile leaves’
  • Leaves of Hibiscus and rose plant are petiolate leaves

Questions based on Petiole:

1) The leaf that do not bear petiole are known as ____ leaf.

    a) Petiolate
    b) Sessile

Solution: (b) The leaf without petiole is known as sessile leaf

2) Which among the following plant examples have petiolate leaves?

    a) Grass
    b) Rose
    c) Both a and b
    d) None of the above

Solution: (b) Rose plant has petiolate leaves, whereas grass has sessile leaves