CBSE Class 12 Biology Human health and Diseases. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
ONE MARK QUESTION
1 What role do macrophages play in providing immunity to humans?
2 Recently chikungunya cases were reported from various parts of the country. Name the vector responsible.
3 How do neutrophils act as a cellular barrier to pathogens in humans?
4 Name the two types of cells in which the HIV multiplies after gaining entry into the human blood.
5 Given below are some human organs. Identify one primary and one secondary lymphoid organs: Liver,Thymus, Stomach,Thyroid, Tonsils
6 How does colostrums provide initial protection against diseases to new born infants? Give one reason.
7 Small allergens trigger sneezing and wheezing in human beings. What causes this type of response by the body?
8 A body of ten years had chicken pox. He is not exposed to have the same disease for the rest of his life. Mention how it is possible.
9 What type of virus causes AIDS? Name its genetic material.
10 Give the scientific name of the parasite that causes malignant malaria in humans.
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