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Class 12 Science (PCB)

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Human Health and Disease

Human Health and Disease

Action PlanNotesQuestionsMock-Test
Study Action Plan (Sorted by Difficulty)
Personal and Public Hygiene
Accuracy: 47%
Total Attempted15
Total Correct7
Total Incorrect8
Difficulty Level:
High
Malaria and Plasmodium Life Cycle
Accuracy: 50%
Total Attempted16
Total Correct8
Total Incorrect8
Difficulty Level:
Medium
Disease and Types of Diseases
Accuracy: 58%
Total Attempted19
Total Correct11
Total Incorrect8
Difficulty Level:
Medium
Prevention and Control of Drug/Alcohol Abuse
Accuracy: 58%
Total Attempted19
Total Correct11
Total Incorrect8
Difficulty Level:
Medium
Cancer Detection and Diagnosis
Accuracy: 60%
Total Attempted15
Total Correct9
Total Incorrect6
Difficulty Level:
Medium
Drug and Alcohol Abuse
Accuracy: 67%
Total Attempted18
Total Correct12
Total Incorrect6
Difficulty Level:
Medium
Lymphoid Organs and Immune Function
Accuracy: 74%
Total Attempted19
Total Correct14
Total Incorrect5
Difficulty Level:
Medium
Malaria Species and Vector
Accuracy: 75%
Total Attempted4
Total Correct3
Total Incorrect1
Difficulty Level:
Low
Vector Control
Accuracy: 75%
Total Attempted4
Total Correct3
Total Incorrect1
Difficulty Level:
Low
Immunity
Accuracy: 76%
Total Attempted21
Total Correct16
Total Incorrect5
Difficulty Level:
Low
Carcinogens and Oncogenes
Accuracy: 80%
Total Attempted5
Total Correct4
Total Incorrect1
Difficulty Level:
Low
Human Health and Disease
Accuracy: 82%
Total Attempted22
Total Correct18
Total Incorrect4
Difficulty Level:
Low
Amoebiasis
Accuracy: 83%
Total Attempted12
Total Correct10
Total Incorrect2
Difficulty Level:
Low
HIV Transmission Routes
Accuracy: 85%
Total Attempted13
Total Correct11
Total Incorrect2
Difficulty Level:
Low
Typhoid
Accuracy: 86%
Total Attempted14
Total Correct12
Total Incorrect2
Difficulty Level:
Low
Vaccination and Immunisation
Accuracy: 86%
Total Attempted21
Total Correct18
Total Incorrect3
Difficulty Level:
Low
Cancer Biology
Accuracy: 87%
Total Attempted15
Total Correct13
Total Incorrect2
Difficulty Level:
Low
Effects of Drug and Alcohol Abuse
Accuracy: 88%
Total Attempted16
Total Correct14
Total Incorrect2
Difficulty Level:
Low
Autoimmune Diseases
Accuracy: 89%
Total Attempted19
Total Correct17
Total Incorrect2
Difficulty Level:
Low
Pathogen Transmission and Control
Accuracy: 91%
Total Attempted23
Total Correct21
Total Incorrect2
Difficulty Level:
Low
B-Lymphocytes and T-Lymphocytes
Accuracy: 92%
Total Attempted12
Total Correct11
Total Incorrect1
Difficulty Level:
Low
Acquired Immunity
Accuracy: 100%
Total Attempted3
Total Correct3
Total Incorrect0
Difficulty Level:
Low
Active and Passive Immunity
Accuracy: 100%
Total Attempted4
Total Correct4
Total Incorrect0
Difficulty Level:
Low
Antibody Structure
Accuracy: 100%
Total Attempted3
Total Correct3
Total Incorrect0
Difficulty Level:
Low
Ascariasis
Accuracy: 100%
Total Attempted2
Total Correct2
Total Incorrect0
Difficulty Level:
Low
Cellular and Cytokine Barriers
Accuracy: 100%
Total Attempted2
Total Correct2
Total Incorrect0
Difficulty Level:
Low
Common Cold
Accuracy: 100%
Total Attempted4
Total Correct4
Total Incorrect0
Difficulty Level:
Low
Filariasis or Elephantiasis
Accuracy: 100%
Total Attempted4
Total Correct4
Total Incorrect0
Difficulty Level:
Low
Humoral and Cell-Mediated Immunity
Accuracy: 100%
Total Attempted4
Total Correct4
Total Incorrect0
Difficulty Level:
Low
Innate Immunity
Accuracy: 100%
Total Attempted3
Total Correct3
Total Incorrect0
Difficulty Level:
Low
Pathogens and Host Adaptation
Accuracy: 100%
Total Attempted11
Total Correct11
Total Incorrect0
Difficulty Level:
Low
Physical and Physiological Barriers
Accuracy: 100%
Total Attempted2
Total Correct2
Total Incorrect0
Difficulty Level:
Low
Pneumonia
Accuracy: 100%
Total Attempted4
Total Correct4
Total Incorrect0
Difficulty Level:
Low
Ringworm
Accuracy: 100%
Total Attempted4
Total Correct4
Total Incorrect0
Difficulty Level:
Low

Learning Objectives

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Learning Objectives

  • Understand the role of biology in human health and disease.
  • Identify the impact of biological knowledge on agriculture and health sectors.
  • Explain the mechanisms of diseases such as AIDS and cancer.
  • Discuss the effects of drug and alcohol abuse on health.
  • Describe the importance of early detection and treatment of cancers.
  • Analyze the factors contributing to drug and alcohol abuse among adolescents.
  • Evaluate public health measures to prevent infectious diseases.
  • Differentiate between innate and acquired immunity.
  • Recognize the significance of lifestyle choices on health outcomes.

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Revision Notes & Summary

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Chapter 7: Human Health and Disease

Overview of Biology in Human Welfare

  • Biology is the youngest of the formalized disciplines of natural science.
  • Progress in physics and chemistry has been faster than in biology.
  • The 20th and 21st centuries have shown the utility of biological knowledge in health and agriculture.
  • Key advancements include:
    • Discovery of antibiotics
    • Synthetic plant-derived drugs
    • Anaesthetics
  • These advancements have significantly changed medical practices and improved human health and life expectancy.

Common Diseases in Humans

Health Definition

  • Health is a state of body and mind where there is a balance of certain 'humors'.
  • Early beliefs by Greeks and Indian Ayurveda were disproven by scientific methods.

Factors Affecting Health

  1. Genetic Disorders: Deficiencies inherited from parents.
  2. Infections: Caused by pathogens.
  3. Lifestyle: Includes diet, exercise, and habits.

Immunity

  • The immune system is influenced by mental state and can maintain health.
  • Types of immunity include:
    • Innate Immunity: General defense mechanisms.
    • Acquired Immunity: Specific responses to pathogens.

AIDS

  • Caused by the human immunodeficiency virus (HIV).
  • Can be prevented with precautions.

Cancer

  • A major cause of death; involves uncontrolled cell growth.
  • Types of tumors:
    • Benign Tumors: Confined to original location.
    • Malignant Tumors: Invade surrounding tissues and can metastasize.
  • Causes include physical, chemical, and biological agents (carcinogens).
  • Early detection is crucial for successful treatment.

Cancer Detection and Diagnosis

  • Methods include:
    • Biopsy and histopathological studies
    • Imaging techniques (X-rays, CT, MRI)

Treatment of Cancer

  • Common approaches:
    • Surgery
    • Radiation therapy
    • Chemotherapy
    • Immunotherapy

Drugs and Alcohol Abuse

Overview

  • Rising concern among youth; leads to harmful effects.
  • Commonly abused drugs include opioids, cannabinoids, and coca alkaloids.

Addiction and Dependence

  • Addiction is a psychological attachment to substances.
  • Dependence leads to withdrawal symptoms when use is stopped.

Effects of Drug/Alcohol Abuse

  • Immediate effects: Reckless behavior, violence, potential for overdose.
  • Long-term effects: Damage to nervous system and liver, social issues.

Prevention and Control

  • Key strategies include:
    1. Avoiding peer pressure.
    2. Education and counseling.
    3. Seeking help from parents and peers.
    4. Identifying danger signs.
    5. Seeking professional help.

Summary

  • Health encompasses physical, mental, social, and psychological well-being.
  • Diseases like typhoid, cholera, and malaria are significant health threats.
  • Public health measures and a strong immune system are essential for disease prevention.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

A disease caused by external pathogens.

B.

A condition where the immune system attacks the body's own cells.

C.

A disease resulting from a deficiency of vitamins.

D.

A condition caused by hormonal imbalance.
Correct Answer: B

Solution:

An autoimmune disease occurs when the immune system mistakenly attacks the body's own cells, leading to conditions such as rheumatoid arthritis.

Chapter Concept:

Autoimmune Diseases

A.

Cannabinoids

B.

Cocaine

C.

Heroin

D.

Nicotine
Correct Answer: C

Solution:

Heroin, chemically known as diacetylmorphine, is an opioid that binds to specific opioid receptors in the central nervous system.

Chapter Concept:

Drug and Alcohol Abuse

A.

Skin

B.

Mucus

C.

Acid in the stomach

D.

Hair
Correct Answer: C

Solution:

Acid in the stomach acts as a physiological barrier by creating an environment that is hostile to microbes, preventing their growth.

Chapter Concept:

Physical and Physiological Barriers

A.

Avoiding undue peer pressure

B.

Seeking professional and medical help

C.

Encouraging experimentation with drugs in a controlled environment

D.

Education and counselling
Correct Answer: C

Solution:

Encouraging experimentation with drugs is not a recommended strategy. Instead, education, counselling, avoiding peer pressure, and seeking professional help are effective measures.

Chapter Concept:

Prevention and Control of Drug/Alcohol Abuse

A.

Amoebiasis

B.

Malaria

C.

Ascariasis

D.

Pneumonia
Correct Answer: B

Solution:

Malaria is transmitted through the bite of an infected female Anopheles mosquito, which acts as a vector.

Chapter Concept:

Human Health and Disease

A.

Sexual contact with an infected person

B.

Sharing infected needles

C.

Casual touch with an infected person

D.

Transfusion of contaminated blood
Correct Answer: C

Solution:

HIV is not transmitted through casual touch. It spreads through sexual contact, sharing infected needles, transfusion of contaminated blood, and from an infected mother to her child through the placenta.

Chapter Concept:

HIV Transmission Routes

A.

Inhibition of opioid receptors

B.

Interference with dopamine transport

C.

Stimulation of cannabinoid receptors

D.

Inhibition of adrenaline release
Correct Answer: B

Solution:

Cocaine interferes with the transport of the neurotransmitter dopamine, leading to its stimulating effects on the central nervous system.

Chapter Concept:

Drug and Alcohol Abuse

A.

Two heavy chains and two light chains arranged in a Y-shaped form

B.

Three heavy chains and one light chain arranged in a linear form

C.

Four light chains arranged in a circular form

D.

Two heavy chains and two light chains arranged in a linear form
Correct Answer: A

Solution:

An antibody molecule is composed of two heavy chains and two light chains arranged in a Y-shaped form, which is crucial for its antigen-binding capability.

Chapter Concept:

Antibody Structure

A.

Body cleanliness

B.

Clean food and water

C.

Proper waste disposal

D.

Regular exercise
Correct Answer: C

Solution:

Proper waste disposal is part of public hygiene, not personal hygiene.

Chapter Concept:

Personal and Public Hygiene

A.

Bone marrow

B.

Thymus

C.

Spleen

D.

Lymph nodes
Correct Answer: B

Solution:

The thymus is the primary lymphoid organ where T-lymphocytes mature. It provides a micro-environment for their development.

Chapter Concept:

Lymphoid Organs and Immune Function

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Human Health and Disease

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True or False

Correct Answer: True

Solution:

Recombinant DNA technology allows for the production of antigenic polypeptides in bacteria or yeast, facilitating the creation of vaccines like the hepatitis B vaccine.

Chapter Concept :

Vaccination and Immunisation

Correct Answer: True

Solution:

Pathogens, such as bacteria, viruses, fungi, protozoans, and helminths, enter the body and adapt to the host environment to multiply and interfere with normal body functions.

Chapter Concept :

Pathogens and Host Adaptation

Correct Answer: True

Solution:

Acquired immunity involves memory, meaning that after the first encounter with a pathogen, the immune system can mount a stronger and faster response upon subsequent exposures. This is due to the presence of memory cells that were generated during the primary response.

Chapter Concept :

Immunity

Correct Answer: True

Solution:

The spleen is a large bean-shaped organ that contains lymphocytes and phagocytes, acting as a filter for the blood by trapping blood-borne microorganisms. It also has a large reservoir of erythrocytes.

Chapter Concept :

Lymphoid Organs and Immune Function

Correct Answer: True

Solution:

Cancer cells lose the property of contact inhibition, which normally prevents cells from dividing uncontrollably when they come into contact with other cells. This loss leads to the formation of tumors.

Chapter Concept :

Cancer Biology

Correct Answer: False

Solution:

Cannabinoids primarily interact with cannabinoid receptors located in the brain, not the gastrointestinal tract.

Chapter Concept :

Drug and Alcohol Abuse

Correct Answer: True

Solution:

Innate immunity provides different types of barriers to prevent the entry of foreign agents into the body and is present from birth.

Chapter Concept :

Immunity

Correct Answer: True

Solution:

Malaria is caused by the protozoan Plasmodium, which requires both human and mosquito hosts to complete its life cycle. The female Anopheles mosquito acts as the vector by transferring the Plasmodium sporozoites to humans through its bite.

Chapter Concept :

Pathogen Transmission and Control

Correct Answer: True

Solution:

Cannabinoids are indeed obtained from the inflorescences of the Cannabis sativa plant, which are used to produce substances like marijuana and hashish.

Chapter Concept :

Drug and Alcohol Abuse

Correct Answer: True

Solution:

Pathogens, including bacteria, viruses, fungi, protozoans, and helminths, enter the body and must adapt to the host environment to multiply and interfere with normal body functions.

Chapter Concept :

Pathogens and Host Adaptation

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