Question

Which one is the most primitive amongst the following?
(a)Bryophytes
(b)Gymnosperm
(c)Monocots
(d)Cyanobacteria

Answer 1

It is a type of microorganism that structurally resembles bacteria (they lack a nucleus and organelles ). They're approximately 2.5 billion years old and thus are the oldest oxygenic phototrophs on Earth. The first evolution of Earth's oxygen-rich atmosphere is presumably thanks to cyanobacterial photosynthesis.

Complete step by step answer:
Cyanobacteria are prokaryotic organisms that lack a membrane-bound nucleus and other membrane-bound organelles like mitochondria, chloroplasts. They also lack a real nucleus. They're believed to be crude living beings since they have an early core and show division practically like amitosis. Amitosis may be a method of cell division during which spindle fibers aren't formed.

So the correct answer is ‘Cyanobacteria’.

Additional information: Cyanobacteria move by floating, utilizing adhesive discharges in light of the fact that the force, or, inside the instance of planktonic genera, by adjusting lightness through gas vesicle development and breakdown.
Cyanobacteria possess remarkable ecophysiological adaptations for global change. They can tolerate desiccation, hypersalinity, hyperthermal, and high ultraviolet conditions, often for several years. Over their long developmental history, they need to shape the various endosymbiotic and mutualistic relationships with microorganisms, higher plants, and creatures, including lichens (parasites), greeneries, cycads, diatoms, seagrasses, wipes, and even polar bears. Cyanobacteria have likewise misused man-made contamination of sea-going conditions, particularly supplement animated essential profitability or eutrophication.

Note:
Cyanobacterial blooms are highly visible, widespread indicators of eutrophication. Due to the toxicity of some bloom taxa, flowers can pose serious water quality and animal and human health problems. The symptoms of bloom-infested waters are foul odors and tastes, oxygen depletion, fish kills, and drinking/recreational impairment. Finally, the massive contribution of cyanobacterial blooms to phytoplankton biomass and ecosystem nutrient fluxes can alter biogeochemical cycling and food cycle dynamics.