Question

A mature ligule having a prominent basal portion is called
A. Glossopodium
B. Rhizophore
C. Trichome
D. None of the above.

Answer 1

Hint:- Leaf and leafstalks junction bears a thin outward projection is known as ligule. It can be found in many sedges and grasses. Some trees possess outgrowth projections from its corolla. These projections are sharp and pointed. Ray floret comprises external extension from the corolla.

Complete step-by-step solution:- an elongated cell structure that is found at the base of ligule is called glossopodium. Glossopodium is found in many species like Selaginella sp. In Selaginella Glossopodium is a bulb-like minute structure which is found at the base of the ligule.
A pole-like structure found in Selaginella Sp, which projected from the point of branches. It dichotomously forks when comes in contact with a hard surface or soil.
Trichome is found in many lichens, algae, and some specific protists. It comprises several structures like hairy, scales, glandular-hairy, etc. Trichomes can be unicellular or multicellular. It comprises a cytoplasm. There are two types of trichome found. These are adaxial and abaxial. When a trichome is present on the upper surface of lateral organs and leaves, it is known as an adaxial trichome. When lateral organs and leaves of the plant bear trichome at the lower surface, it is called the abaxial trichome.

Note:- Ligule is one of the major components of grass. It comprises a strap-like structure. The functions of ligule though remain unknown but it is expected that ligule is responsible for providing the leaves and culm protection by enclosing it from entering the dust, water, and other molecules like harmful spore, etc.