Cyanobacteria and some other photosynthetic bacteria don't have chloroplasts. How do they conduct photosynthesis?

Cyanobacteria and hetero-trophic bacteria have been clubbed together in Eubacteria of kingdom Monera as perthe "Five Kingdom Classification" even though the two are vastly different from each other. Is this grouping of the two types of taxa in the same kingdom justified? If so, why?

Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic CO_2 requirements?

Suppose there were plants that had a high concentration of Chlorophyll b, but lacked chlorophyll a, would it carry out photosynthesis? Then why do plants have chlorophyll b and other accessory pigments?

How do you plants obtain food? Name the two phases of photosynthesis?

Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions?

How are photosynthesis and respiration related to each other?

How do bacteria causing typhoid enter body.

In Opuntia the stem is modified into a falttened green structure to perform the function of leaves. Cite some other examples of modifications of plant parts for the purpose of photosynthesis.