CBSE 2025 · Region 4 · Set 1 · Q17 · 2 marks
Explain how the immunity of a person is affected if there is atrophy (degeneration) of the thymus gland at an early stage of life.(b)What are interferons ? Explain their role in providing immunity to a person.(ii)Which category of innate immunity defence barrier can interferons be classified into ?
Explain how the immunity of a person is affected if there is atrophy (degeneration) of the thymus gland at an early stage of life.
(b)
What are interferons ? Explain their role in providing immunity to a person.
(ii)
Which category of innate immunity defence barrier can interferons be classified into ?
Marking-scheme solution
The immunity will decrease.
Immature lymphocytes will not differentiate into antigen – sensitive
lymphocytes / development and maturation of T-lymphocytes does not take place.
(b)
• Virus infected cells secrete proteins called interferons.
• Interferons protect non-infected cells from further viral infection
(ii)
Cytokine barriers.
Human Health and DiseaseImmunityUnderstandvery_short_answermedium
More from Human Health and Disease
- Name the category of drugs represented by the chemical structure given above. If the methyl group is…2023 · asked 3×
- Lactobacillus that sets milk into curd is categorised as:2024 · asked 3×
- Explain, giving two reasons, how immune response by "vaccine" is different from that by "antitoxin" in humans.2022 · asked 3×
- Student to attempt either option or. Describe any two situations where a medical doctor would recommend…2025 · asked 3×
- (i) Draw the structure of an antibody molecule and label any four of its parts. (ii) Differentiate between…2026 · asked 3×
- Assertion: Virus-infected cells produce interferons. Reason (R): Interferons can cause inflammation of…2024 · asked 3×
- Out of the following, select the correct match:2025 · asked 3×
- Though filariasis is not fatal, but the disease in humans is responsible for considerable suffering, gross…2022 · asked 3×
CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.