Botany and Plant Science

The peristome lies immediately below the operculum. It consists of two sets of long, conical teeth, one within the other. There are sixteen teeth in each set. The teeth of both the sets are on the same radii and thus opposite to each other.

When the mature capsule begins to dry up the thin walled cells of the annulus break and the operculum is thrown away. Dropping off the operculum is assisted by the outward hygroscopic movement of the underlying peristomial teeth. Due to this movement, slits between the inner thin walled peristomial teeth become wider and spores escape gradually through these slits. In a wet atmosphere, the wet peristomial teeth bend inwards and thus closing the slits and prevent the escape of spores. The seta of the mature sporophyte also exhibits hygroscopic movements. In dry weather, by loosing water, it twists and bents, thus helping in dispersal of spores.

Spore is the first cell of gametophytic generation. On a suitable damp habitat, a meiospore of Funaria germinates into a filamentous green alga-like structure called protonema. Protonema has green epiterranean chloronemal branches (chlornema) and non-green subterranean rhizoidal branches (caulonema). The protonema of moss, represents the juvenile stage of gametophyte. 

The haploid phase in the life cycle of Funaria is represented by independent leafy gametophyte. The gametophyte is developed from the spore.

The sporogonium of Funaria is attached to the gametophyte and derives water and minerals from it, though it can perform some photosynthesis.

Protonema is a characteristic juvenile filamentous stage in the life cycle of mosses like Funaria. Riccia is a liverwort, Dryopteris is a fern, and Spirogyra is an alga.

The structures in Funaria are called stem-like and leaf-like because they lack true vascular tissue (xylem and phloem) and belong to the gametophytic generation, not the sporophytic generation typical of vascular plants.

The protonema is the first stage of the moss gametophyte, which develops directly from a germinating spore. It is characteristically green, filamentous, and branched.

The fusion of male and female gametes results in a zygote. While terms like oospore are sometimes used in specific botanical contexts, zygote is the standard biological term for the product of fertilization.

Bryophyte sperms (antherozoids) are biflagellate and typically curved or spirally coiled. Option B is the standard description for Funaria.

Meiosis in Funaria occurs within the capsule inside the spore mother cells to produce haploid spores.

Funaria is monoecious (both sex organs on the same plant) and autoicous (sex organs on different branches of the same plant).

The columella is a central, sterile column of tissue within the capsule of the Funaria sporophyte.

Spores are the first cells of the gametophytic generation in the moss life cycle, as they are haploid and germinate to form the protonema.

In Funaria, the rhizoids develop from the basal region of the gametophytic axis.