Question

which of the following is true about gonyaulax​

Answer 1

Answer:

A- (IV), B- (III), C- (II), D- (I)

Eubacteria is one of the domains of biological classification of living organisms and is composed of prokaryotic organisms bacteria. Anabaena is a genus of Cyanobacteria that form filamentous colonies with specialised cells, capable of nitrogen fixation.

Gonyaulax is a genus of red dinoflagellates  ( which produce red tide or red discolouration of sea water by pigmented cells of Gonyaulax) that are aquatic organisms with two flagella. One flagellum extends backwards and the other wraps around the cell in lateral groove helping to keep the organism afloat by rotational motility.  

Phycomycetes are lower fungi, also called algae fungi because of aquatic habitat and form of thallus. It is a subtype of oomycetes. Albugo is a genus of oomycetes. Albugo causes white rust or white blister disease in above-ground plant tissues.

Deuteromycete are imperfect fungi. They reproduce asexually.Trichoderma species are imperfect filamentous fungi belonging to the class Deuteromycete. Trichoderma is usually opportunistic avirulent plant symbiotic.

Thus, the correct answer is option C.

Explanation:

Answer 2

Answer:

Question:

Which of the following is true about gonyaulax​ ?

1. Heterotropic
2. Slow multiplication causing red tide
3. Release toxin
4. All of the above

Answer - 3) Release toxin

Explanation:

• Gonyaulax, genus dinoflagellate, belongs to the red dinoflagellates. It is an aquatic organism and has two flagellates (one extends backward and the other wraps around the cell in a lateral groove that help the organism in rotational motility). It is photosynthetic.
• Red tides occur in the seawater due to the rapid multiplication of Gonyaulax spp.
• It releases different toxins that can kill marine organisms and humans. For example; saxitoxin causes paralysis in humans, and Gonyaulax spinifera releases yessotoxins (YTXs, polyether toxins) that accumulate in shellfish and produce symptoms similar to PSP (paralytic shellfish poisoning) toxins symptoms.  
• It protects itself from harsh conditions such as high salinity, high temperature, etc by becoming a resting cyst (resting spore).  

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