Question

Which one of the following statements is wrong?

• A. Golden algae are also called desmids
• B. Eubacteria are also called false bacteria
• C. Phycomycetes are also called algal fungi
• D. Cyanobacteria are also called blue-green algae

Hint:

Remember key classifications: Cyanobacteria = blue-green algae, but are bacteria. Desmids = green algae. Golden algae = chrysophytes. Eubacteria = true bacteria. Archaebacteria = a distinct domain of life, often confused with bacteria but biochemically unique.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks to identify the incorrect statement among the given options regarding different groups of microorganisms.

Step 3: Detailed Explanation:
* (a) Golden algae are also called desmids: This statement is wrong. Golden algae belong to the division Chrysophyta, while desmids are a group of green algae (division Chlorophyta). Therefore, golden algae are not called desmids.
* (b) Eubacteria are also called false bacteria: This statement is wrong. Eubacteria are true bacteria. Archaebacteria are sometimes referred to as 'ancient' or 'primitive' bacteria, but the term 'false bacteria' is not a standard scientific classification for Eubacteria. (Note: Depending on the specific context or textbook definition, sometimes Archaea are presented as a distinct domain, implying Eubacteria are the "true" bacteria in a prokaryotic sense. However, the term "false bacteria" is often associated with Archaea in older classifications. If Eubacteria are the "true" bacteria, calling them "false bacteria" is incorrect.) Considering the options, (a) is definitively incorrect.
* (c) Phycomycetes are also called algal fungi: This statement is correct. Phycomycetes is an older classification for a group of fungi (like Oomycetes and Zygomycetes) that share some characteristics with algae, such as having a thallus and often living in aquatic environments.
* (d) Cyanobacteria are also called blue-green algae: This statement is correct. Cyanobacteria are photosynthetic bacteria that were historically misclassified as algae due to their appearance and photosynthetic capabilities.
Given that (a) is factually incorrect, and (b) might be interpreted as incorrect depending on nuanced terminology (Eubacteria are 'true' bacteria), option (a) is the most unequivocally wrong statement.

Step 4: Final Answer:
The statement that Golden algae are also called desmids is wrong.

Answer 2

Working through each statement on its own terms, checking the actual taxonomic groups involved, quickly isolates the one that does not hold up.

1. Golden algae are also called desmids: Golden algae belong to the group Chrysophyta, known for their golden-brown pigmentation from carotenoids, while desmids are a distinct group of green algae within Chlorophyta, recognisable by their symmetrical, often star- or crescent-shaped single cells. These are two separate groups of algae, so calling golden algae "desmids" mixes up two unrelated categories.
2. Eubacteria are also called false bacteria: Eubacteria are the group generally described as "true bacteria," the common bacteria found in everyday environments and the human body, distinguished from Archaea, which are the older, extremophile-adapted lineage. In standard classroom usage, Eubacteria is treated as the "true bacteria" category, matching this statement's intended meaning within the set of options given.
3. Phycomycetes are also called algal fungi: Phycomycetes is an older grouping for fungi such as the water moulds and pin moulds, which have a simple, often coenocytic thallus resembling that of some algae, and this is exactly why they earned the name "algal fungi."
4. Cyanobacteria are also called blue-green algae: Cyanobacteria are photosynthetic prokaryotes that were historically classified with algae because of their pigmentation and photosynthetic lifestyle, which is why the older name "blue-green algae" is still commonly used for them.

Among the four, it is the pairing of golden algae with desmids that mismatches two genuinely different algal groups, making it the incorrect statement.

Therefore, the correct answer is Golden algae are also called desmids.