Conjoint Type of Vascular Bundles:

Vascular bundles are specialized structures found in plants that transport fluids and nutrients throughout the plant. They are composed of xylem and phloem tissues, which are responsible for the transport of water, minerals, and sugars. Vascular bundles can be classified into two types: conjoint and collateral.

Conjoint type of vascular bundles are those in which xylem and phloem tissues are present together within the same bundle. This type of arrangement is common in stems and leaves, which is the correct answer (option C).

Explanation:

Stems:
In stems, the xylem and phloem tissues are arranged in a concentric manner within the vascular bundles. The xylem tissue is located towards the center of the bundle, while the phloem tissue is present towards the periphery. This arrangement allows for efficient transport of water and nutrients from the roots to the leaves and other parts of the plant.

Leaves:
In leaves, the vascular bundles are usually arranged in a parallel manner, with multiple bundles running along the length of the leaf. Each bundle contains both xylem and phloem tissues. This arrangement ensures that water and nutrients can be transported efficiently between the leaf and the rest of the plant.

Advantages of Conjoint Type of Vascular Bundles:
- Efficient transport: The presence of both xylem and phloem tissues within the same bundle allows for the simultaneous transport of water, minerals, and sugars. This ensures that the plant receives the necessary nutrients for growth and development.
- Structural support: The arrangement of vascular bundles provides structural support to the plant, especially in stems. This helps the plant to maintain an upright posture and withstand external stresses.
- Flexibility: The presence of conjoint vascular bundles in both stems and leaves allows for flexibility in the transport of fluids and nutrients. This enables the plant to respond to changing environmental conditions and adjust its growth and development accordingly.

In conclusion, conjoint type of vascular bundles are common in stems and leaves. This arrangement facilitates efficient transport of water, minerals, and sugars throughout the plant, ensuring its growth and survival.