Human Health And Disease

Step 1: Droplet infection का अर्थ.
Droplet infection का मतलब है — रोगाणुओं का हवा में छोड़ी गई बूंदों (sneezing/coughing से) के द्वारा फैलना।

Step 2: रोगों का विश्लेषण.
(A) सिफलिस → यह STD है।
(B) टेटनस → wound infection से।
(C) टायफाइड → water/food borne।
(D) निमोनिया → यह मुख्य रूप से droplet infection से फैलता है।

Step 3: निष्कर्ष.
सही उत्तर है (D) निमोनिया।

Step 1: Understanding memory cells.
मैमरी कोशिकाएँ प्रतिरक्षा प्रणाली का एक महत्त्वपूर्ण हिस्सा हैं। ये एक प्रकार की लिम्फोसाइट्स होती हैं।

Step 2: Function.
ये कोशिकाएँ किसी रोगाणु के विरुद्ध हुई पहली प्रतिक्रिया को "याद" रखती हैं और भविष्य में उसी रोगाणु के प्रवेश पर तीव्र प्रतिक्रिया देती हैं।

Step 3: Conclusion.
इसलिए सही उत्तर है (B) लिम्फोसाइट्स।

Step 1: परिचय.
लिम्फोसाइट श्वेत रक्त कोशिकाओं का एक महत्त्वपूर्ण प्रकार है जो शरीर की प्रतिरक्षा प्रणाली में प्रमुख भूमिका निभाता है। ये मुख्यतः T-लिम्फोसाइट और B-लिम्फोसाइट दो प्रकार के होते हैं।

Step 2: B-लिम्फोसाइट का निर्माण.
- B-लिम्फोसाइट अस्थि मज्जा (Bone marrow) में बनते और परिपक्व होते हैं।
- ये एंटीबॉडी का उत्पादन करके ह्यूमरल इम्यूनिटी प्रदान करते हैं।

Step 3: T-लिम्फोसाइट का निर्माण.
- T-लिम्फोसाइट अस्थि मज्जा में बनते हैं लेकिन इनकी परिपक्वता थाइमस ग्रंथि में होती है।
- ये कोशिका-जनित प्रतिरक्षा (cell-mediated immunity) में सहायक होते हैं।

Step 4: निष्कर्ष.
T और B लिम्फोसाइट अस्थि मज्जा से उत्पन्न होते हैं परंतु परिपक्वता की प्रक्रिया अलग-अलग स्थानों पर होती है।

Step 1: परिभाषा.
सारकोमा (Sarcoma) एक प्रकार का कैंसर है जो शरीर के सहायक ऊतकों (connective tissues) जैसे हड्डी, उपास्थि, मांसपेशी, वसा, नसों और रक्त वाहिनियों में उत्पन्न होता है।

Step 2: विशेषताएँ.
- यह तेजी से बढ़ने वाला malignant tumor है।
- शरीर के अन्य हिस्सों में मेटास्टेसिस कर सकता है।

Step 3: उदाहरण.
- Osteosarcoma (हड्डियों का कैंसर)
- Liposarcoma (वसा ऊतक का कैंसर)
- Rhabdomyosarcoma (मांसपेशियों का कैंसर)

Step 4: निष्कर्ष.
सारकोमा कैंसर का एक गंभीर रूप है, जिसका शीघ्र निदान और उपचार आवश्यक है।

Step 1: STDs का परिचय.
Sexually transmitted diseases (STDs) कई प्रकार के pathogens से फैलते हैं। Genital herpes एक viral STD है जो Herpes simplex virus द्वारा फैलता है।

Step 2: अन्य विकल्पों का विश्लेषण.
(A) हेपेटाइटिस A → यह food और water borne है।
(C) पैपिलोमा विषाणु → यह genital warts और cervical cancer से जुड़ा है, पर herpes से अलग।
(D) ट्राइकोमोनास → यह एक protozoan infection है।

Step 3: निष्कर्ष.
सही उत्तर है (B) हर्पीस विषाणु।

Step 1: T-lymphocytes का निर्माण.
T-lymphocytes का मूल निर्माण अस्थि-मज्जा (Bone marrow) में होता है और maturation थाइमस ग्रंथि में होती है।

Step 2: अन्य विकल्पों का विश्लेषण.
(A) यकृत → मुख्य रूप से blood detoxification का कार्य करता है।
(B) थाइमस → T-cell maturation का केंद्र।
(C) अस्थि-मज्जा → सभी lymphocytes का निर्माण यहीं से होता है।

Step 3: निष्कर्ष.
सही उत्तर है (D) (B) और (C) दोनों।

Step 1: Retrovirus का परिचय.
Retrovirus वह virus है जो RNA को DNA में reverse transcriptase enzyme द्वारा बदलता है। HIV (Human Immunodeficiency Virus) एक retrovirus है।

Step 2: रोगजनक.
HIV एड्स (AIDS) का कारण बनता है।

Step 3: अन्य विकल्पों का विश्लेषण.
(A) प्लास्मोडियम → मलेरिया का कारण।
(B) सिफलिस → Treponema pallidum bacteria के कारण।

Step 4: निष्कर्ष.
सही उत्तर है (C) एड्स।

Step 1: Mange disease का परिचय.
कुक्कुर खेजक (Dog mange) एक skin disease है जो बाह्य परजीवी (mites) के कारण होती है।

Step 2: अन्य विकल्पों का विश्लेषण.
(A) जीवाणु → bacterial diseases का कारण होते हैं।
(C) विषाणु → viral diseases का कारण।
(D) आंत परजीवी → intestinal diseases का कारण।

Step 3: निष्कर्ष.
सही उत्तर है (B) बाह्य परजीवी।

Step 1: Antibody production.
Antibodies (प्रतिरक्षी) का निर्माण B-lymphocytes और plasma cells द्वारा किया जाता है।

Step 2: अन्य विकल्पों का विश्लेषण.
(A) मोनोसाइट → Phagocytosis में कार्य करते हैं।
(B) न्यूट्रोफिल्स → रोगाणु निगलते हैं।
(D) बेसोफिल्स → Histamine release करते हैं।

Step 3: निष्कर्ष.
सही उत्तर है (C) लिम्फोसाइट्स।

Step 1: Understanding cardiac glycosides.
Cardiac glycosides are toxic compounds that affect the heart by altering cardiac muscle contractions.
Step 2: Source plants.
Calotropis (milkweed) produces poisonous cardiac glycosides, which are harmful if ingested.
Step 3: Analyzing options.
(A) Cactus: Incorrect — No cardiac glycosides.
(B) Calotropis: Correct — Produces toxic glycosides.
(C) Coffee plant: Incorrect — Contains caffeine, not glycosides.
(D) Tobacco: Incorrect — Contains nicotine, not glycosides.
Step 4: Conclusion.
Thus, Calotropis is the plant producing cardiac glycosides.

Primary Immunity.
Primary immunity, also known as innate immunity, is the first line of defense against pathogens. It is a nonspecific response, meaning it does not target specific pathogens but acts against any foreign invader. The components of primary immunity include:
1. Physical barriers: The skin, mucous membranes, and cilia prevent the entry of pathogens.
2. Chemical barriers: Enzymes, stomach acid, and antimicrobial peptides help kill or neutralize harmful invaders.
3. Cellular defenses: White blood cells like neutrophils and macrophages engulf and destroy pathogens through phagocytosis.
Conclusion.
Primary immunity provides immediate, nonspecific protection from infections.

Step 1: Definition.
Cell-mediated immunity (CMI) is an immune response that does not involve antibodies but instead uses T-lymphocytes to destroy infected or abnormal cells.
Step 2: Mechanism.
1. Antigen-presenting cells present antigens to T-helper cells.
2. Cytotoxic T-cells are activated.
3. These T-cells destroy virus-infected cells, tumor cells, or transplanted tissues.
Step 3: Importance.
CMI provides defense against intracellular pathogens (viruses, some bacteria) and cancer cells.
Step 4: Conclusion.
CMI is an essential defense mechanism mediated by T-cells rather than antibodies.

Step 1: Species of Plasmodium infecting humans.
1. Plasmodium vivax
2. Plasmodium malariae
3. Plasmodium ovale
4. Plasmodium falciparum
Step 2: Malignant malaria.
Plasmodium falciparum causes malignant malaria (cerebral malaria), the most dangerous form with high fatality.
Step 3: Conclusion.
Thus, Plasmodium falciparum is responsible for malignant malaria.

Allergy.
Allergy is an immune system reaction to foreign substances known as allergens. These substances may include pollen, dust mites, mold, certain foods, and insect venom. When a person with an allergy encounters an allergen, the immune system overreacts, producing symptoms such as:
1. Sneezing
2. Itchy eyes
3. Runny nose
4. Swelling
5. Anaphylaxis in severe cases.
The immune system produces IgE antibodies against allergens, which trigger the release of histamine and other chemicals that cause inflammation. Treatment options include antihistamines and immunotherapy.
Conclusion.
Allergy involves an overreaction of the immune system to harmless substances

Step 1: Understanding HIV.
HIV (Human Immunodeficiency Virus) is a retrovirus that primarily attacks the immune system. It targets cells that play a crucial role in immunity.
Step 2: Target cells.
HIV specifically infects CD4+ T-helper cells. By destroying these cells, HIV weakens the immune response, leading to AIDS.
Step 3: Analyzing options.
(A) B-cells: Incorrect — B-cells produce antibodies but are not the main HIV target.
(B) T-cells: Incomplete — Refers to all T-cells, but HIV specifically targets T-helper (CD4+) cells.
(C) Epithelial cell: Incorrect — These are not the site of HIV attack.
(D) T-helper cell: Correct — HIV targets and destroys CD4+ T-helper cells.
Step 4: Conclusion.
Thus, HIV attacks T-helper cells.

Step 1: About Widal test.
The Widal test is a diagnostic test used to detect the presence of antibodies against Salmonella typhi, the bacterium causing typhoid fever.
Step 2: Analysis of options.
(1) Malaria – Confirmed by blood smear or antigen tests, not Widal.
(2) Typhoid – Correct, confirmed by Widal test.
(3) AIDS – Diagnosed using ELISA and Western blot, not Widal.
(4) Pneumonia – Confirmed by chest X-ray or sputum analysis.
Step 3: Conclusion.
Thus, the Widal test confirms (2) Typhoid fever.

Step 1: Understanding disease classification.
Infectious diseases are caused by pathogens such as bacteria, viruses, protozoa, or fungi. Non-infectious diseases are not caused by pathogens but result from genetic, environmental, or lifestyle factors.
Step 2: Analysis of options.
(1) AIDS: Infectious, caused by HIV virus.
(2) Malaria: Infectious, caused by Plasmodium protozoa.
(3) Cancer: Non-infectious, caused by uncontrolled cell growth.
(4) Typhoid: Infectious, caused by Salmonella typhi bacteria.
Step 3: Conclusion.
Hence, the correct answer is (3) Cancer.

Step 1: Understanding PMNL.
PMNL stands for Polymorphonuclear leukocytes, which are a type of white blood cell characterized by a nucleus with multiple lobes.
Step 2: Role of neutrophils.
Neutrophils are the most abundant PMNLs and play a major role in the innate immune system by engulfing pathogens through phagocytosis.
Step 3: Elimination of wrong options.
(1) Lymphocytes: Mononuclear, not PMNL.
(2) Monocytes: Also mononuclear, not PMNL.
(3) Neutrophils: Correct, they are polymorphonuclear.
(4) Platelets: Not cells but fragments, hence not PMNL.
Step 4: Conclusion.
Thus, the correct answer is (3) Neutrophil.

Step 1: Understanding colostrum.
Colostrum is the first secretion from the mammary glands after childbirth, rich in antibodies that protect the newborn.
Step 2: Key antibody.
IgA is the main immunoglobulin present in colostrum, which protects mucous membranes of infants from infections.
Step 3: Option analysis.
(1) IgA – Correct, abundantly present in colostrum.
(2) IgG – Present but not in high concentration.
(3) IgM – Found in trace amounts.
(4) IgD – Rarely present in colostrum.
Step 4: Conclusion.
Thus, the correct answer is (1) IgA.

Step 1: Understanding diacetyl morphine.
Diacetyl morphine is a semi-synthetic derivative of morphine. It is commonly known as heroin, a highly addictive opioid drug.
Step 2: Analysis of options.
(1) Codeine – Another opiate but not diacetyl morphine.
(2) Heroin – Correct, diacetyl morphine is the chemical name of heroin.
(3) Cannabinoid – Different psychoactive compounds derived from cannabis.
(4) Coke – Common name for cocaine, not diacetyl morphine.
Step 3: Conclusion.
Thus, diacetyl morphine is (2) Heroin.

Pathogens are microorganisms, viruses, or other agents that cause disease in their hosts. Step 1: Definition of pathogens.
- Pathogens can be bacteria, fungi, viruses, or other organisms that invade the body and cause infections.
Step 2: Examples of pathogens.
- Plant pathogen: \textit{Phytophthora infestans}, which causes late blight in potatoes. - Animal pathogen: \textit{Plasmodium falciparum}, which causes malaria in humans.
Final Answer: - Plant pathogen: \textit{Phytophthora infestans} - Animal pathogen: \textit{Plasmodium falciparum}

Step 1: Understand the term Gynandromorph.
A gynandromorph is an organism that exhibits both male and female characteristics, which can occur due to genetic or hormonal factors.
Step 2: Analyze other options.
- Polymorph refers to an organism or species that exists in multiple forms. - Jollymorph is not a recognized term in biology. - Gynomorph refers to a female form of an organism but does not specifically denote a man with female characteristics.
Step 3: Conclusion.
The correct term for a man with female characteristics is ((D), gynandromorph.
Final Answer:

Step 1: Identify STDs.
Both Syphilis and Gonorrhoea are sexually transmitted diseases (STDs).
Step 2: Conclusion.
Therefore, the correct answer is ((C), as both ((A) Syphilis and ((B) Gonorrhoea are STDs.
Final Answer:

Step 1: Understand the cell division processes.
- Mitosis is the process by which somatic cells divide to form two identical daughter cells, and it is the mechanism through which most cancer cells divide. - Amitosis is a direct form of cell division where the nucleus divides without the typical stages of mitosis, and it is not typical for cancer cells. - Meiosis is a type of cell division that reduces the chromosome number by half and is involved in gamete formation, not in cancer cell division.
Step 2: Review the options.
- Cancer cells primarily divide through mitosis, which leads to the uncontrolled growth characteristic of tumors. - Amitosis and meiosis do not play a major role in the division of cancer cells. - "None of these" is incorrect because mitosis is the correct answer.
Step 3: Conclude.
Cancer cells divide through mitosis, making option (A) the correct answer.
Final Answer:

Step 1: Understand malaria.
Malaria is a disease caused by the Plasmodium parasite, which is transmitted through the bite of infected Anopheles mosquitoes.
Step 2: Review the options.
- Plasmodium is the correct pathogen responsible for causing malaria.
- Wuchereria causes filariasis, not malaria.
- Sacromyces is a genus of yeast, not related to malaria.
- Puccinia is a genus of fungi that causes wheat rust, unrelated to malaria.
Step 3: Conclude.
Plasmodium is the causative agent of malaria, making option (A) the correct answer.
Final Answer: