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प्रश्न
Why do you think it is not possible to produce vaccine against 'common cold'?
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उत्तर
Vaccines target specific pathogens and elicit immunity. In case of common cold, more than 200 strains of viruses are responsible for causing the disease. Hence it is practically difficult to develop vaccine against it.
संबंधित प्रश्न
Study a part of the life cycle of malarial parasite given below. Answer the questions that follow:
(a) Mention the roles of ‘A’ in the life cycle of the malarial parasite.
(b) Name the event ‘C’ and the organ where this event occurs.
(c) Identify the organ ‘B’ and name the cells being released from it.
Why is Gambusia introduced into drains and ponds?
Show with the help of a flow chart only, the life cycle of malarial parasite in humans.
What complications will arise if the blood of an Rh-positive person is transfused to an Rh-negative person and vice versa?
Mention the causative agent and the preventive measures for the following: Pneumonia.
Match the pathogens with respective diseases caused by them and select the correct match using the codes given below.
| Column I | Column II |
| I. Leishmania donavani | 1. Malaria |
| II. Wuchereria bancrofti | 2. Amoebiasis |
| III. Trypanosoma gambiense | 3. Kala - azar |
| IV. Entamoeba histolytica | 4. Sleeping sickness |
| 5. Filariasis |
Complete the following table:
| Diseases | Causative agent | Site of infection | Incubation period |
| Mumps | |||
| Chicken pox | |||
| Dengue fever |
List the causative agent, mode of transmission and symptoms for Diphtheria and Typhoid.
What is Kala-azar?
Leishmaniasis is a disease caused by a protozoan parasite transmitted by biting of ______.
Pneumonia is caused by ______.
Which of the following is not the causal organism for ringworm?
A person with sickle cell anemia is ______.
The harmful allele of sickle cell anemia has not been eliminated from human population. Such afflicted people derive some other benefit. Discuss.
“Maintenance of personal and public hygiene is necessary for prevention and control of many infectious diseases”. Justify the statement giving suitable examples.
Represent schematically the life cycle of a malarial parasite.
Write the scientific name of the causative agent of the following disease:
Typhoid
Match List I with List II.
| List I | List II |
| A. Common Cold | I. Plasmodium |
| B. Haemozoin | II. Typhoid |
| C. Widal test | III. Rhinoviruses |
| D. Allergy | IV. Dust mites |
Choose the correct answer from the options given below:
