NEET BIOLOGY

Detailed explanation-1: -The middle vein of a compound leaf or a frond, when it is present, is called a rachis. The leaflets all have a common point of attachment at the end of the petiole, radiating like fingers of a hand; for example, Cannabis (hemp) and Aesculus (buckeyes). Leaflets are arranged either side of the main axis, or rachis.

Detailed explanation-2: -Pinnately compound leaves are a type of compound leaves. Here lamina is divided into multiple leaflets or pinnules. Leaflets are attached to the common axis that is called the rachis. The rachis is the midrib. Leaves are categorised into simple leaves and compound leaves based on the division in the lamina.

Detailed explanation-3: -Midrib is the thickest vein present in the middle of the leaf. It separates the lamina or leaf blade into 2 parts. Smaller veins are observed radiating from the midrib.

Detailed explanation-4: -Hint: Rachis is an axis present in the plant, on which leaves are attached. It is known as the main axis. It is present in compound leaves. In a compound leaf, many leaflets are attached to a common axis known as the rachis.

Detailed explanation-5: -In pinnately compound leaf, the midrib forms a common axis called rachis. These types of leaves are present in neem plant.