Tissues found in both xylem and phloem
The correct answer is option B: Vascular cambium and cork cambium. Let's understand why these tissues are found in both xylem and phloem.

1. Introduction
Plant tissues are classified into various types based on their structure and function. Xylem and phloem are two important types of plant tissues responsible for the transport of water, minerals, and nutrients throughout the plant body. While xylem transports water and minerals from roots to other parts of the plant, phloem transports organic nutrients like sugars from leaves to other parts.

2. Xylem
Xylem is a complex tissue composed of several different cell types. The main components of xylem are:

i. Tracheids: These are long, narrow, tube-like cells that are interconnected through pits. They are responsible for the transport of water and minerals.

ii. Vessels: These are wider and shorter cells compared to tracheids. They are arranged end-to-end to form long tubes called vessels. Vessels allow for efficient water transport due to their larger diameter.

iii. Xylem fibers: These are elongated cells with thick walls that provide mechanical support to the plant.

iv. Xylem parenchyma: These are living cells that store food and provide metabolic support to other xylem cells.

3. Phloem
Phloem is also a complex tissue composed of different cell types. The main components of phloem are:

i. Sieve elements: These are specialized cells called sieve tube members and companion cells. Sieve tube members are responsible for the transport of organic nutrients, while companion cells provide metabolic support to sieve tube members.

ii. Sieve cells: In some plants, sieve cells are present instead of sieve tube members. They perform a similar function of transporting organic nutrients.

iii. Phloem fibers: These are elongated cells with thick walls that provide mechanical support to the plant.

iv. Phloem parenchyma: These are living cells that store food and provide metabolic support to other phloem cells.

4. Vascular cambium and cork cambium
Vascular cambium is a type of lateral meristem that is responsible for secondary growth in plants. It is present between the xylem and phloem and gives rise to new cells in both tissues. The cells produced towards the inside of the vascular cambium differentiate into xylem elements, while the cells produced towards the outside differentiate into phloem elements.

Cork cambium, also known as phellogen, is another type of lateral meristem that produces cork cells. Cork cells form the outer protective layer of the plant called the cork or bark. The cork cambium is found outside the vascular cambium and is part of the periderm, which replaces the epidermis in older stems and roots.

5. Conclusion
In conclusion, the vascular cambium and cork cambium are plant tissues that are found in both xylem and phloem. The vascular cambium gives rise to new cells in both xylem and phloem, while the cork cambium produces cork cells for protection. These tissues play important roles in the growth and development of plants.

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