Somatic hybridization - Fusion of two diverse cells
- Somatic hybridization is a technique that involves the fusion of two different cells, usually from different plant species.
- It is used to combine desirable traits from different plants into a single hybrid plant.
- The resulting hybrid plant can possess the desirable characteristics of both parent plants.
- This technique is commonly used in crop improvement programs to develop plants with increased resistance to diseases, pests, and environmental stress.

Vector DNA - Site for t-RNA synthesis
- Vector DNA refers to a DNA molecule that is used as a vehicle to transfer foreign genetic material into a host organism.
- It can be a plasmid, a virus, or a bacteriophage.
- The main function of vector DNA is to replicate and maintain the foreign DNA in the host organism.
- It does not have any role in t-RNA synthesis, which is the process of synthesizing transfer RNA molecules that are involved in protein synthesis.

Micropropagation - in vitro production of plants in large numbers
- Micropropagation is a technique used to produce a large number of plants from a small piece of plant tissue, such as a shoot tip or a leaf.
- It involves the culture of plant cells or tissues in a nutrient medium under sterile conditions.
- The plant cells or tissues grow and develop into complete plants that can be transferred to soil.
- This technique is widely used in plant breeding, conservation of rare and endangered species, and commercial production of plants.

Callus - Unorganised mass of cell produced in tissue culture
- Callus refers to an unorganized mass of cells that is produced in tissue culture.
- It is formed when plant cells or tissues are cultured on a nutrient medium.
- Callus can be induced from various plant parts, such as leaves, stems, or roots.
- It is often used as a starting material for somatic embryogenesis and organogenesis, where it can be induced to differentiate into shoots, roots, or embryos.

Explanation of the incorrect option: Vector DNA - Site for t-RNA synthesis
- The incorrect option is B, which states that vector DNA is the site for t-RNA synthesis.
- This statement is incorrect because vector DNA is not involved in t-RNA synthesis.
- t-RNA synthesis occurs in the nucleus of cells and is carried out by RNA polymerase III, which transcribes t-RNA genes.
- The function of vector DNA is to transfer foreign genetic material into a host organism, not to synthesize t-RNA.
- Therefore, option B is a case of wrong matching.