Human Health and Disease
185 CBSE Class 12 Biology past-year questions from 5 papers, 2022 to 2026, with answers and worked solutions.
- Difficulty: 137 easy · 37 moderate · 11 hard.
- Most-asked subtopics: Immunity (76), Common Diseases in Humans (47), Drugs and Alcohol Abuse (35).
- Updated 8 October 2026.
#1Common Diseases in Humans
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Read the following passage and answer the questions that follow : "Mosquitoes are drastically affecting the human health in almost all the developing tropical countries. Different species of mosquitoes cause very fatal diseases so much so that many humans loose their life and if they survive, are unable to put in productive hours to sustain their life. With the result the health index of the country goes down."#9Common Diseases in Humans
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For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#11Common Diseases in Humans
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For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#17Common Diseases in Humans
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For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#20Common Diseases in Humans
Read the following passage and answer the questions that follow : "Mosquitoes are drastically affecting the human health in almost all the developing tropical countries. Different species of mosquitoes cause very fatal diseases so much so that many humans loose their life and if they survive, are unable to put in productive hours to sustain their life. With the result the health index of the country goes down."#21Common Diseases in Humans
Read the following passage and answer the questions that follow : "Mosquitoes are drastically affecting the human health in almost all the developing tropical countries. Different species of mosquitoes cause very fatal diseases so much so that many humans loose their life and if they survive, are unable to put in productive hours to sustain their life. With the result the health index of the country goes down."#22Common Diseases in Humans
Read the following passage and answer the questions that follow : "Mosquitoes are drastically affecting the human health in almost all the developing tropical countries. Different species of mosquitoes cause very fatal diseases so much so that many humans loose their life and if they survive, are unable to put in productive hours to sustain their life. With the result the health index of the country goes down."#23Common Diseases in Humans
Read the following passage and answer the questions that follow : "Mosquitoes are drastically affecting the human health in almost all the developing tropical countries. Different species of mosquitoes cause very fatal diseases so much so that many humans loose their life and if they survive, are unable to put in productive hours to sustain their life. With the result the health index of the country goes down."#24Common Diseases in Humans
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When a microorganism invades a host, a definite sequence of events usually occur leading to infection and disease, causing suffering to the host. This process is called pathogenesis. Once a microorganism overcomes the defense system of the host, development of the disease follows a certain sequence of events as shown in the graph. Study the graph given below for the sequence of events leading to appearance of a disease and answer the questions that follow :#31Common Diseases in Humans
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Question numbers 13 to 16 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below :#34Common Diseases in Humans
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The diagram shows the life cycle of a pathogenic protozoan.#36Common Diseases in Humans
The diagram shows the life cycle of a pathogenic protozoan.#37Common Diseases in Humans
The diagram shows the life cycle of a pathogenic protozoan.#38Common Diseases in Humans
The diagram shows the life cycle of a pathogenic protozoan.#39Common Diseases in Humans
The diagram shows the life cycle of a pathogenic protozoan.#40Common Diseases in Humans
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#48Immunity
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