Question

Petiole is winged in-
(a) Citrus
(b) Pea leaf
(c) Dionaea leaf
(d) Both A and C

Answer 1

Hint: Petiole is the stalk that attaches the leaf blade to the stem and can twist the leaf to face the sun when required, to facilitate in their process of food making, that is, photosynthesis.

Complete answer: Winged petiole is the one in which there is a thin flange of tissue along the length of the petiole. It is a green and flattened petiole. Plants like Citrus and Dionaea have winged petiole in them.
This also gives a characteristic foliage arrangement to the plant. Outgrowth present on each side of the petiole in some species is called stipules. Leaves that do not have petiole are called sessile or apetiolate.

Additional Information:
1. Plants with compound leaves have their leaflets attached to a continuation in the petiole. This is called the rachis. Each leaflet may be attached to the rachis by a short stalk which is called a petiole.
2. Swollen regions may be present at either end of the petiole and this is known as pulvina. These are composed of flexible tissue and allow leaf movement. Pulvina is commonly seen in the bean family- Fabaceae and the prayer plant family- Marantaceae.
3. In some plants, the petioles are flattened and widened so as to become phyllodes or cladophylls, and here the true leaves may be reduced or absent. Thus, the phyllode itself serves the functions of the leaf. Phyllodes are commonly seen in genus Acacia, especially the Australian species.
So, the correct answer is ‘Both A and C'.

Note: Leaves are responsible for fueling plants through photosynthesis and the petiole serves to transport the energy made in the leaf to rest all parts of the plant.
It also serves to transport nutrients and water which are absorbed by the roots and passed up through the xylem, to the leaf.