Practice question

Hornworts Anthocerotophyta exhibit distinctive cellular and reproductive features separating them clearly from other bryophytes. Each gametophytic cell typically possesses single large lens-shaped chloroplast with pyrenoid-like structure containing aggregated RuBisCO enzymes surrounded by starch grains, reminiscent of algal ancestors and uncommon in other land plants. By contrast mosses and liverworts contain many small discoid chloroplasts per cell. Sporophyte shows basal intercalary meristem with continuous indeterminate growth, stomata on capsule wall, and symbiotic Nostoc cyanobacterial colonies in thallus slime cavities providing nitrogen fixation.