Test cross is the cross of the individuals with its homozygous recessive parent. In other words, we can say that it is a specialized back cross of F1 hybrid with it's homozygous recessive parent in order to determine whether it is homozygous or heterozygous for a character. Reciprocal cross is the cross that could be made either way or independent of the sex of the parents. Dihybrid cross is the cross of the hybrids of F1 generations with either of its parents. 

The correct answer is option 'D', which states that the mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called a test cross.

A test cross is a breeding experiment performed to determine the genotype of an individual for a particular trait. It involves crossing the individual in question with another individual that is known to be homozygous recessive for that trait. By observing the phenotypic ratios of the offspring, the genotype of the individual being tested can be determined.

Here is a detailed explanation of why the other options are not correct:

a) Back cross:
A back cross involves crossing an individual with one of its parents or an organism with one of its close relatives. This is done to reinforce certain traits or to determine if the individual being crossed is homozygous or heterozygous for a particular trait. However, a back cross does not specifically involve mating with a double recessive individual to determine the genotype.

b) Dihybrid cross:
A dihybrid cross is a breeding experiment performed to study the inheritance of two different traits simultaneously. It involves crossing two individuals that are heterozygous for both traits. This type of cross is not specifically used to determine whether an individual is homozygous or heterozygous for a single trait.

c) Reciprocal cross:
A reciprocal cross involves switching the sex of the parents in a breeding experiment to determine if the inheritance pattern of a trait is influenced by the sex of the parent. This type of cross does not specifically involve mating with a double recessive individual to determine the genotype.

In summary, a test cross is the appropriate breeding experiment to determine whether an organism is homozygous or heterozygous for a character under consideration. This involves mating the organism with a double recessive individual and observing the phenotypic ratios of the offspring. The correct answer is option 'D'.

Test cross means pure homozygous recessive characteristic organism is crossed to determine genotype of any organism example: let, we consider Tt is hybrid,long height characteristic of plant & tt is pure ,recessive short characteristic of plant now we crossed between them Tt × tt > Tt and tt that mean ratio of genotype 1:1 so that we determine above the result that how genetic type of F1 so that this type of cross is called test cross