Cells of calyptra and wall of sporogonium in Riccia are respectively:
d) Haploid, Diploid

Calyptra:
The calyptra is a protective cap-like structure that covers the developing capsule (sporogonium) in mosses and liverworts. It is derived from the archegonium, which is a female reproductive structure.

Cells of calyptra:
The cells of the calyptra are haploid. Haploid cells contain only one set of chromosomes, which is the half number of chromosomes found in a diploid cell. In the life cycle of a liverwort like Riccia, the calyptra is formed from haploid cells of the gametophyte generation.

Wall of sporogonium:
The sporogonium is the diploid stage in the life cycle of a liverwort. It is the structure that produces spores through meiosis.

Cells of the wall of sporogonium:
The cells of the wall of the sporogonium are diploid. Diploid cells contain two sets of chromosomes, one set inherited from each parent. This is because the sporogonium is formed from the fusion of haploid gametes during fertilization, resulting in a diploid zygote. The zygote then undergoes mitotic divisions to form the multicellular diploid sporophyte, which includes the sporogonium.

In Riccia, the cells of the calyptra are haploid, while the cells of the wall of the sporogonium are diploid. This is a common feature in the life cycle of liverworts, where the gametophyte generation is haploid and produces gametes through mitosis, whereas the sporophyte generation is diploid and produces spores through meiosis.

Overall, the haploid cells of the calyptra protect and support the development of the diploid sporogonium, which eventually releases spores for reproduction in liverworts like Riccia.