CSS Paper Botany 2013 MCQs

Funaria is monoecious, meaning that both male (antheridia) and female (archegonia) reproductive organs are borne on the same individual plant. Specifically, it is autoicous, where the male and female branches are distinct but located on the same gametophyte.

In liverworts, which are members of the Bryophyta, the dominant and independent phase of the life cycle is the gametophyte. The sporophyte is typically small, short-lived, and dependent on the gametophyte for nutrition throughout its development.

Gemmae are specialized multicellular asexual reproductive bodies produced in gemma cups. When detached from the parent plant, they germinate to form new gametophytic plants, serving as a primary method of vegetative propagation in many bryophytes.

Sphagnum, commonly known as peat moss, has unique hyaline cells that can absorb and retain large amounts of water. Because of this property, it is extensively used in horticulture to pack live plant materials, such as bulbs and seedlings, to keep them moist and prevent desiccation during shipment.

In Funaria, the gametangia (antheridia and archegonia) are protected by specialized leaves known as perichaetial leaves. These leaves cluster around the sex organs to provide protection during development, which is a common feature in many moss species.

In the leafy liverwort Porella, the leaves are typically incubous and divided into two lobes: a larger dorsal lobe and a smaller ventral lobe known as the lobule. The lobule is often folded or saccate, which helps in water retention and provides a micro-habitat for small organisms.

In the anatomical study of complex moss stems like Polytrichum, the medulla is often differentiated into distinct regions. These include the central zone, which contains specialized conducting tissues, and the peripheral zone, which surrounds the central region and provides structural support.

Mosses are bryophytes that thrive in damp, shaded, and moist habitats. They require water for the process of fertilization, as the flagellated male gametes must swim through a film of water to reach the archegonia. While liverworts and hornworts also prefer moisture, mosses are widely recognized for their prevalence in such environments.

In the moss Polytrichum, the endothecium undergoes specific divisions during the development of the capsule. The third ring of the endothecium is characterized by a high degree of cell division, resulting in 32 cells, which eventually contribute to the formation of the sporogenous tissue within the capsule.

In the life cycle of mosses, the protonema stage consists of filamentous structures. The chloronema is the primary, green, photosynthetic filament that grows along the surface of the substratum or extends into the air. It is responsible for the initial establishment and nutrient absorption of the developing gametophyte before the formation of the leafy gametophore.