Question

In Funaria, rhizoid contains 10 chromosomes, then the number of chromosome in seta, leaf, and calyptras are respectively
A. 20, 10, 20
B. 10, 20, 20
C. 20, 20, 10
D. 20, 10, 10

Answer 1

Hint: Funaria is a moss species often referred to as common moss. They reproduce sexually by spore formation. A protonema stage develops to form a gametophytic plant body. They consist of rhizoids in place of roots.

Complete answer:Funaria is a moss genus consisting of around 210 known species. They are commonly referred to as common moss or cord moss. Their body consists of twisted seta which untwists under moist conditions. Funaria reproduces sexually by spore formation. The spores stay enclosed in a capsule structure that sustains them during unfavorable situations. The moss plant Funaria usually grows in dense patches or like cushions in moist and cool places. They are found proliferating in high numbers during the rainy season.
The Funaria have a haplo-diplontic life cycle. The haploid gametophytes alternate with diplontic sporophytes. Alternation of generation occurs in Funaria. The main plant in Funaria is haploid. The gametes fuse to form diploid or 2n sporophytes. These spores stay enclosed in a capsule attached to the female gametophyte plant.
The rhizoids are the root-like structures of the Funaria moss plant. If they contain 10 chromosomes then the number of chromosomes in seta will be 20. The seta is the part of the sporogonium attached to the female receptacle. It is a long stalk-like structure that holds a pear-shaped capsule on its tip. So, it is a reproductive product of the Funaria and hence is diploid. The leaves and calyptratus have a haploid number of gametes as they are somatic cells. So, they both will have 10 chromosomes. The calyptra is the protective shield around the immature growing capsule.
Hence, the correct answer is option D. 20, 10, 10

Note: A Funaria plant ranges in size from 1 to 3 centimeter long. They are erect and branched plant bodies. The main parts of Funaria are rhizoids, axes, and leaves. The Funaria is Bryophytes. This means that they can live in water as well as on land.