- 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
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?
c) Both a and b
d) None of the above
Solution: (b) Rose plant has petiolate leaves, whereas grass has sessile leaves