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.
Solution: (b) The leaf without petiole is known as sessile leaf
2) Which among the following plant examples have petiolate leaves?
- a) Grass
c) Both a and b
d) None of the above
Solution: (b) Rose plant has petiolate leaves, whereas grass has sessile leaves