Question:

Ulothrix can be described as a

Updated On: Jul 25, 2024
  • filamentous alga lacking flagellated reproductive stages
  • membranous alga producing zoospores
  • filamentous alga with flagellated reproductive stages
  • non-motile colonial alga lacking zoospores.
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The Correct Option is C

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Ulothrix is a green filamentous alga, belonging to class chlorophyceae. The plant body is an unbranched filament consisting of numerous cylindrical cells joined end and end. Under favourable conditions, each cell produces zoospores except holdfast. These zoospores are of two types - Macrozoospores and microzoospores. The macrozoospores are larger in size and are quadriflagellate and the microzoospores are smaller zoospores which may be bi flagellate or quadrifagelleate. Under unfavourable conditions, nonmotile mitospores called aplanospores are produced. Sexual reproduction in Ulothrix is of isogamous type. The isogametes fuse to form a quadriflagellate zygospore which after meiosis forms 16 aplanospores or zoospores.
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Flagellated reproductive phases in filamentous algae  Ulothrix is a filamentous green algae found to adhere to a substrate. Ulothrix's reproductive stage produces biflagellated spores, which are engaged in sexual reproduction.
 
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Ulothrix is a green filamentous alga of the Chlorophyceae family. The plant body is an unbranched filament made up of several cylindrical cells that are linked end to end. Except for Holdfast, each cell generates zoospores under favourable circumstances. There are two kinds of zoospores: macrozoospores and microzoospores. The macrozoospores are bigger and quadriflagellate, whereas the microzoospores are smaller and biflagellate or quadriflagellate. Nonmotile mitospores termed aplanospores are formed in unfavourable settings. Ulothrix has isogamous sexual reproduction. The isogametes unite to generate a quadriflagellate zygospore, which then divides into 16 aplanospores or zoospores after meiosis.
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Concepts Used:

Plant Kingdom

The Plant Kingdom comprises all the plants that have some shared characteristics. These are bacteria (prokaryotes), photosynthetic plants, fungi, and several non-photosynthetic plants.

Read Also: Two Kingdom Classification

Several features of Kingdom Plantae are as follows:

  • They are stationary. They are static and usually remain in one place only.
  • They have branches that expanded and green leaves due to the presence of chlorophyll.
  • They are an autotrophic mode of nutrition that simply means they prepare their food with the help of water, sunlight and carbon dioxide. It is further known as self-nutrition.
  • They indulge in photosynthesis during the day and therefore more carbon dioxide is needed during the day and at night it is released.
  • They secure their food in the form of starch-like algae.
  • They have an inelastic wall around their cell known as a cell wall comprised of cellulose.
  • There is an absence of the nervous system and excretory system.
  • Reproduction is entirely dependent on air, insects and water. Asexual and vegetative method of reproduction is noticed or detected.
  • The non-photosynthetic plants acquire their food through parasitism, i.e through their host like Indian pipe.

Read More: Classification of Plants