Question

Bicollateral vascular bundles have tissue arrangement
a. Outer Phloem-Outer Cambium-Middle Xylem-Inner Cambium-Inner Phloem
b. Outer Xylem-Outer Cambium-Middle Phloem-Inner Cambium-Inner Xylem
c. Outer Phloem-Outer Xylem-Middle Cambium
d. Outer Cambium-Outer Phloem-Middle Xylem-Inner Phloem-Inner Cambium

Answer 1

Hint: The primary function of vascular bundles is to transport food and water. Along with this, they provide support and protection to the tissues. In higher plants, the vascular bundles consist of xylem and phloem arranged in various ways.

Complete answer:
The various types of vascular bundles are:
> Radial Vascular Bundles: In this type of vascular bundle, the xylem and the phloem are arranged alternately in circles.

> Collateral open vascular bundles: In this type of vascular bundle, the phloem is located on the outer side, then the cambium and then the xylem on the inner side.

> Collateral closed vascular bundle: In this type of vascular bundle, the phloem is located on the outer side while the xylem is located on the inner side. The cambium is absent in this.

> Bicollateral vascular system: In this type of vascular bundle, there is an outer phloem then an outer cambium. This is followed by the middle xylem, inner cambium and the inner phloem.

> Concentric amphicribral vascular Bundle: In this type of vascular bundle, the xylem is enclosed inside the phloem.

> Concentric amphivasal vascular Bundle: In this type of vascular bundle, the phloem is enclosed inside the xylem.

Now as we are well aware of the different types of vascular bundle.
Hence, the correct answer is option (a).

Note: The bicollateral vascular bundles have phloem on both the sides (outer as well as inner side) and are separated from the xylem due to the presence of cambium on both the sides. Cambium provides partially undifferentiated cells, which help in plant growth.