Why do we fall ill? (CBSE-IX)

Acute diseases are characterized by a rapid onset and a short duration, as opposed to chronic diseases which persist over a long period.

Food provides the necessary nutrients and energy required for the body to function and maintain health. While medicines treat illness, food is the fundamental requirement for sustaining health.

The term disease is derived from the words dis (meaning apart or away) and ease, literally translating to a state of being disturbed or not at ease.

Elephantiasis is a long-term condition caused by parasitic worms, making it a chronic disease rather than an acute one, which typically lasts for a short duration.

Common cold symptoms typically include runny nose, congestion, and sneezing. Options A, B, and C are not standard symptoms of a simple common cold.

Most diseases have multiple causes, including immediate causes (like a pathogen) and contributory causes (like poor nutrition or environmental factors).

An acute disease is one that appears suddenly and lasts for a short period. The common cold fits this definition perfectly.

Immediate causes of disease are generally classified into two types: infectious (biological agents) and non-infectious (lifestyle, genetic, or environmental factors).

Infectious diseases are caused by pathogens, which are biological organisms such as bacteria, viruses, fungi, and protozoa, collectively referred to as microbes.

Tuberculosis is a chronic infectious disease that often leads to significant weight loss, persistent cough, and chronic fatigue.

Loose motions is most commonly caused by viral infections, particularly rotavirus, norovirus, and other enteric viruses. While bacteria can also cause diarrhea, viral infections are the predominant cause, especially in children.

Health is defined by the World Health Organization as a state of complete physical, mental, and social well-being, not merely the absence of disease.

Acne is commonly associated with the bacteria Propionibacterium acnes, but in many textbooks, Staphylococci are also cited as skin-dwelling bacteria that can contribute to infections.

Helicobacter pylori was identified as the primary cause of peptic ulcers, a discovery that changed the treatment of the condition.

Ascaris lumbricoides is the scientific name for the human roundworm.

Good health depends on a combination of factors including balanced nutrition, a clean environment, and social/economic stability, which allows for access to resources.

Many common skin infections, such as ringworm or athlete's foot, are caused by fungi.

Kala-azar (visceral leishmaniasis) is caused by a protozoan parasite of the genus Leishmania, which is not a bacteria, virus, or worm.

Malaria is caused by the Plasmodium parasite, which is a type of protozoa transmitted by the Anopheles mosquito.

Regular exercise is a key component of maintaining physical health and preventing various lifestyle-related diseases.

Elephantiasis is caused by parasitic filarial worms that block the lymphatic system.

Barry Marshall and Robin Warren were awarded the Nobel Prize in 2005 for their discovery of the bacterium Helicobacter pylori and its role in gastritis and peptic ulcer disease.