Question

The smallest bryophyte with a length of 0-5 cm is
A. Cryptothallus
B. Radula
C. Zoopsis
D. Polytrichum

Answer 1

Hint: The word bryophyte is a general term for mosses, hornworts, and liverworts. These all are plants, technically identified within the Kingdom of Plants. These are spore-producing plants instead of seed-producing plants, but they're all lacking flowers. As with any living organism, bryophytes are hierarchically ranked.

Complete answer:
The Zoopsis genus seems to be in the Lepidoziaceae family of a major smallest Bryophytes group (Mosses and liverworts). These plants are shiny, greenish, and spreading. Deciduous leaves of this kind of plants are found only near the emerging tip of the stem or branches in which they are present as individual cells, or seldom as 3-cell ephemeral vestiges. Zoopsis can also be found growing in a wide range of temperatures, elevations (sea to alpine), and moisture content (dry deserts to wet rain-forests). They can thrive where vascularized plants will grow since they do not rely mostly on roots to absorb nutrients in the soil. Bryophytes can exist on rocks and barren soils.
So, the correct answer is option C.

Additional information:
Cryptothallus is a species of liverworts. The plants are tiny and light to pale green due to a complete lack of chlorophyll. That several have other pigments, notably in cell walls, and sometimes in the cytoplasm of the cell. The plants are thin, barely growing over 3 cm in length. The radula is an internal organ used only by mollusks for eating, often linked to the tongue. This is a thin, chitinous ribbon that is usually used for scraping or cutting food just before food reaches the esophagus. Mosses in the genus Polytrichum are endohydric, which implies that the water should be drawn from the bottom of the plant. Though mosses are known to be non-vascular plants, the Polytrichum mosses show a significant distinction of water-conducting tissues.

Note: Zoopsis is distinguished by plants that are small to very small in size, pellucid, light to pure green, nitid when dry, thinly crawling, quite often in intertwined thin patches. They are small-sized and prefer moist habitats, even though they can live in dry conditions. Bryophytes produce confined reproductive structures, but will not grow flowers or seeds. They reproduce by means of spores.