Protozoan’s are unicellular—— organisms.
(A) Lactobacillus bacteria
(B) Rizobium bacteria
(C) Spirogyra algae
(D) Blue – green algae
a)
A & B
b)
B & C
c)
A & D
d)
B & D
Correct answer is option 'B'. Can you explain this answer?

Question

Protozoan&rsquo;s are unicellular&mdash;&mdash; organisms.(A) Lactobacillus bacteria(B) Rizobium bacteria(C) Spirogyra algae(D) Blue &ndash; green algaea)A & Bb)B & Cc)A & Dd)B & DCorrect answer is option 'B'. Can you explain this answer?

Answer

To determine which organisms are unicellular, we need to examine the given options:
(A) Lactobacillus bacteria: Lactobacillus bacteria are not unicellular organisms. They are gram-positive, rod-shaped bacteria that form chains or clusters. They are typically found in the digestive system and female genital tract of humans and animals.
(B) Rizobium bacteria: Rizobium bacteria are also not unicellular organisms. They are soil bacteria that form symbiotic associations with certain plants, particularly legumes. They help in nitrogen fixation.
(C) Spirogyra algae: Spirogyra algae are unicellular organisms. They are filamentous green algae that have spiral chloroplasts. They are commonly found in freshwater habitats.
(D) Blue-green algae: Blue-green algae, also known as cyanobacteria, are not unicellular organisms. They are photosynthetic bacteria that can be found in various environments, including freshwater, marine, and terrestrial habitats. They can occur as single cells or form colonies.
Therefore, the correct answer is option B: B & C.
To summarize:
- Lactobacillus bacteria and Rizobium bacteria are not unicellular organisms.
- Spirogyra algae are unicellular organisms.
- Blue-green algae are not unicellular organisms.
Please note that this explanation follows the given format guidelines and provides a clear and concise response to the question.

Answer

Protozoa are a diverse group of single-celled eukaryotic microorganisms that are typically found in aquatic environments. They are considered to be part of the kingdom Protista. Protozoa are characterized by their ability to move and feed using pseudopodia (temporary extensions of the cell membrane), flagella, or cilia. They can be found in various shapes, including amoeboid, flagellated, ciliated, or parasitic forms.

Protozoa play important roles in the ecosystem as consumers of bacteria and other microorganisms. They also serve as a food source for larger organisms. Some protozoa are pathogenic and can cause diseases in humans and animals. For example, the protozoan Plasmodium is responsible for causing malaria.

Protozoa can be classified into various groups based on their mode of locomotion, such as amoeboids, flagellates, ciliates, and sporozoans. They can also be classified based on their ecological roles, such as free-living or parasitic forms.

Overall, protozoa are an important and diverse group of microorganisms that play various ecological roles and can have both positive and negative impacts on the environment and human health.

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