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Which one of the following is correctly matched?
(a) Onion - Bulb
(b) Ginger - Sucker
(c) Chlamydomonas - Conidia
(d) Yeast - Zoospores

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Last updated date: 19th Apr 2024
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Answer
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Hint: Various stem modifications can be observed in nature for food storage, protection or to carry out photosynthesis. The underground or subterranean stems lie beneath the surface of the soil for the motive of perennation.

Complete answer:
The bulb is a type of underground stem modification observed in Onion. It is an underground pyriform(pear-shaped) structure with a slightly conical disc-shaped stem and numerous fleshy scales enclosing a terminal bud. A number of adventitious roots arise from its base. The bulbs are non green, store food, and take part in perennation. Buds and roots occur over them which can be used as a tool of vegetative propagation.

Additional Information:
   The rhizome is a perennial fleshy underground stem which is differentiated into nodes and internodes just as a usual stem. It is of two types based on its position under the soil- Rootstock, when the rhizome is upright or oblique with the tip almost reaching the soil surface as well as unbranched, and, Straggling- when the rhizome is horizontal and branched. Ginger is an example of a straggling rhizome.
Yeast is a fungus and belongs to the subclass Ascomycetes.they multiply asexually through the formation of conidia. Conidia are asexual mitospores produced exogenously on stalked structures ‘conidiophores’. Conidia are often green, pink, or blue and thus provides coloration to the fungus.
Chlamydomonas is a microscopic, eukaryotic, unicellular, pyriform, and biflagellated green algae found in both freshwater and marine water. It reproduces asexually through the formation of zoospores. These are motile spores formed in zoosporangium- a sac-like structure that bursts to release zoospores.
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So, the correct answer is ‘ Onion - Bulb’.

Note:
Mitosis is a type of division where a cell is divided in such a manner that the daughter cells receive the exact number of chromosomes as the parent cell. Mitospores are formed via mitosis. E.g.Sporangiospores, Conidia. On the other hand, meiospores are formed by meiosis. It is a type of division where daughter cells receive half the number of chromosomes as their parents. They give rise to haploid individuals. E.g. Ascospores, Basidiospores.