Question

Leaf is imparipinnate in
a. Rose
b. Cassia
c. Quisqualis
d. Guava

Answer 1

Imparipinnate leaf means Several paired leaflets with an unpaired terminal central leaflet. The left side leaf is imparipinnate (odd-pinnate) and the right side is paripinnate (even pinnate). Imparipinnate means having an unpaired terminal leaflet.

Complete answer:

Option A. Rose has several paired leaflets with an unpaired terminal central leaflet. Therefore we can say rose leaf is imparipinnate. So it is the right option.

Option B. In Cassia, leaves grow alternatively on the stem that is spirally arranged. It has a compound leaf. leaflets present on both sides. So it is the wrong option.

Option C. In Quisqualis the leaf blades fall off and the petioles become hard and spinous. So it is also a wrong option.

Option D. In Guava leaves are grown in an opposite arrangement. That means two leaves grow at the same point on either side of the stem. They have short petioles or stalks, it joins the leaf to the stem. So it is the wrong option.

Hence, the correct answer is option (A).

Note: Imparipinnate leaves are types of pinnately compound leaves. It contains arranged leaflets in opposite arrangements on the rachis. leaflets can be evenly or oddly paired. In the evenly paired pinnate leaves, the leaflets are arranged in an opposite manner and the rachis ends with two leaflets. It is called Paripinnate and in oddly paired pinnate leaves, the leaflets are arranged in opposite fashion with a trailing leaf at the anterior end of the rachis. It is called imparipinnate.