Class 12 Biology - HARYANA
Human Health and Disease
The chapter Human Health and Disease in Class 12 Biology for Haryana (BSEH) board exams explores the fundamental concepts of health, common infectious and non-infectious diseases, and the human immune system. Students learn about pathogens like bacteria, viruses, and protozoa that cause diseases such as typhoid, pneumonia, malaria, and ascariasis. The chapter also covers the mechanics of innate and acquired immunity, active and passive immunization, vaccination, allergies, and autoimmunity. Furthermore, it delves into the severe impacts of AIDS and cancer on human health, along with the physiological and social consequences of drug and alcohol abuse.
Start Learning FreeKey Concepts
Pathogens and Diseases
Disease-causing organisms like bacteria, viruses, fungi, and parasites that invade the human body and disrupt normal physiological functions.
Innate and Acquired Immunity
Innate immunity is non-specific defense present from birth, while acquired immunity is pathogen-specific and characterized by memory upon subsequent encounters.
Active and Passive Immunity
Active immunity develops when a person's own immune system produces antibodies after encountering antigens, whereas passive immunity involves receiving readymade antibodies directly.
AIDS and HIV
Acquired Immuno Deficiency Syndrome is caused by the Human Immunodeficiency Virus, which progressively destroys helper T-lymphocytes, severely compromising the immune system.
Cancer Biology
Characterized by uncontrolled and abnormal cell division, leading to mass formations called tumors that can be benign or malignant and spread via metastasis.
Drug and Alcohol Abuse
The harmful dependence on opioids, cannabinoids, and coca alkaloids that negatively alter brain chemistry, physical health, and social behavior.
Important Formulas
Board Exam Info
In the Haryana (BSEH) Class 12 Biology board examination, this chapter typically carries around 4 to 6 marks. Questions frequently include short-answer questions on life cycles of pathogens (like Plasmodium), differences between active and passive immunity, structure of antibodies, and long-answer questions detailing AIDS, cancer, or drug abuse.
Frequently Asked Questions
What is the difference between active and passive immunity?
Active immunity is developed by the host's own immune system when exposed to antigens, offering long-lasting protection. Passive immunity is provided by administering ready-made antibodies from an external source, offering immediate but temporary protection.
Why is Plasmodium falciparum considered dangerous?
Plasmodium falciparum causes malignant malaria, which is the most severe and potentially fatal form of malaria compared to species like P. vivax.
How does HIV replicate inside the human body?
After entering a helper T-cell, the HIV viral RNA genome replicates to form viral DNA using the enzyme reverse transcriptase. This viral DNA incorporates into the host cell's DNA and directs the production of new virus particles.
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