Microorganisms - 1

Chlorella is a unicellular green algae rich in protein and nutrients, used as a dietary supplement. It contains all essential amino acids, vitamins, and minerals. Spirulynara, Chlamydomonas, and Volvox are not typically used as supplements - they're either studied as research organisms or have different applications.

Commensals are microorganisms that live on or in a host and benefit from the relationship without causing harm. Unlike parasites, which damage the host, or mutualists, which provide benefit in return, commensals have a neutral relationship. Examples include skin bacteria like Staphylococcus epidermidis that normally don't cause disease.

Late blight of potato is caused by the fungus Phytophthora infestans (though technically an oomycete, historically classified as a fungus). This devastating disease caused the Irish Potato Famine. Viruses, amoebae, and bacteria do not cause late blight - they cause other plant diseases but not this specific condition.

Yeast (Saccharomyces cerevisiae) is used in alcohol production through fermentation. It converts sugars into ethanol and carbon dioxide. Mushrooms are fungi used for food, Mucor is a bread mold, and algae are photosynthetic organisms - none produce alcohol through fermentation. Yeast's ability to ferment sugars makes it essential in brewing and winemaking.

Diatoms have several industrial applications due to their silica-based cell walls. They are used in insulation materials (diatomaceous earth for pipes and refrigerators), fire-resistant materials, and historically in dynamite preparation (to stabilize nitroglycerin). Diatoms are not used for food preparation - they are microscopic algae collected for industrial uses, not culinary purposes.

Mumps, Polio, and Rabies are all caused by viruses. Mumps virus causes salivary gland inflammation, Poliovirus attacks the nervous system causing paralysis, and Rabies virus affects the brain. Dysentery is primarily caused by bacteria (Shigella) or protozoa (Entamoeba histolytica), not by viruses - it involves intestinal inflammation and bloody diarrhea.

Malaria is caused by the protozoan Plasmodium, which requires a vector to complete its life cycle and transmit between humans. The female Anopheles mosquito serves as this carrier (vector) - when it bites an infected person, it takes up Plasmodium gametocytes, which develop in its gut and are later injected into a new host during another blood meal. Entamoeba causes dysentery, houseflies spread mechanical contamination, and dogs carry rabies virus.

Ringworm (dermatophytosis) is a fungal infection of the skin, hair, or nails caused by dermatophytes like Trichophyton, Microsporum, and Epidermophyton. These fungi digest keratin and cause characteristic ring-shaped rashes. Bacteria cause different infections (like staphylococcal or streptococcal), viruses cause conditions like chickenpox or measles, and protozoa cause diseases like malaria or dysentery.

Yellow vein mosaic of okra (Bhindi) is a viral disease caused by Bhendi yellow vein mosaic virus (BYVMV), a Geminivirus. It is transmitted by the whitefly Bemisia tabaci and causes characteristic yellow mosaic patterns on leaves, vein thickening, and stunted plant growth. Bacterial diseases include citrus canker or blight, fungal diseases include rusts and smuts, and protozoa do not typically affect plants.

Viruses are acellular organisms - they consist only of genetic material (DNA or RNA) enclosed in a protein coat (capsid), lacking cellular organelles, cytoplasm, or cell membranes. They cannot reproduce independently and require a host cell. In contrast, bacteria are single-celled prokaryotes, fungi are multicellular or unicellular eukaryotes with chitin cell walls, and algae range from unicellular to multicellular eukaryotes.

Hepatitis B is caused by the Hepatitis B virus (HBV), a hepatotropic DNA virus that infects liver cells and can cause acute or chronic liver disease, cirrhosis, or liver cancer. It is transmitted through blood or bodily fluids. Bacteria cause conditions like tuberculosis or cholera, fungi cause infections like candidiasis or aspergillosis, and Plasmodium causes malaria (a protozoan, not a virus or bacterium).

Viruses are obligate intracellular parasites that can ONLY reproduce inside host cells. They lack their own metabolic machinery and must hijack the host cell's ribosomes, enzymes, and resources to replicate their genetic material and produce new virions. Bacteria, protozoa, and fungi can all reproduce independently outside host organisms - bacteria divide by binary fission, protozoa reproduce through various asexual/sexual methods, and fungi produce spores or undergo budding.

ORS stands for Oral Rehydration Solution, a simple but life-saving mixture of clean water, salt (sodium chloride), and sugar (glucose). It is used to treat dehydration caused by diarrhea, cholera, and other gastrointestinal infections. The glucose enhances sodium absorption in the intestines through the SGLT1 transporter, helping the body retain water and electrolytes. The other options are not the standard medical term.

The DPT vaccine (also called DTP) protects against three bacterial diseases: Diphtheria (Corynebacterium diphtheriae), Pertussis or whooping cough (Bordetella pertussis), and Tetanus (Clostridium tetani). All three causative organisms are bacteria that produce toxins affecting the respiratory system or nervous system. DPT does not target viruses (like polio or measles in other vaccines), fungi, or protozoa.

Malaria is caused by protozoan parasites of the genus Plasmodium (P. falciparum, P. vivax, P. ovale, P. malariae). These parasites infect red blood cells and cause the characteristic fever cycles, anemia, and complications of malaria. Anopheles is the mosquito genus that transmits Plasmodium but does not cause malaria itself. Entamoeba causes dysentery, and Rhizopus is a fungus that causes mucormycosis.

Communicable (infectious) diseases spread from person to person through pathogens. Cholera (bacterial Vibrio cholerae through water), Common cold (viral through air/droplets), and Chickenpox (varicella-zoster virus through air/droplets) are all communicable. Anemia is a non-communicable condition - it is a deficiency disease caused by lack of red blood cells or hemoglobin (from iron deficiency, vitamin B12 deficiency, blood loss, or genetic conditions like thalassemia), not by infectious agents.

Algae, viruses, and bacteria are all microscopic organisms that cannot be seen without a microscope. Ants are insects visible to the naked eye, making them macroscopic organisms, not microorganisms.

Mushrooms, moulds, and yeast are all members of the fungal kingdom. Diatoms are single-celled algae with silica shells, belonging to kingdom Protista, not Fungi.

Algae are photosynthetic organisms that contain chlorophyll and produce their own food using sunlight. Mushrooms are fungi, while amoeba and plasmodium are non-photosynthetic protists.