Question
Why does the platelet count decrease in dengue patient?
✓
Answer
- The causative pathogen of dengue is dengue virus which induces bone marrow suppression. Since in bone marrow blood cells are formed its suppression causes the deficiency of blood cells leading to low platelet count.
- The dengue virus also links with platelets in the blood when there is a virus-specific antibody present in the human body.
- When vascular endothelial cell which are infected with dengue virus gets combined with platelets, they tend to destroy platelets. This is one of the major causes of low platelet count in dengue fever.
- Even the antibodies that are produced after infection of the dengue virus also cause the destruction of platelets, thus lowering the platelet count.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Looking at the deteriorating air quality because of air pollution in many cities of the country, the citizens are very much worried and concerned about their health. The doctors have declared health emergency in the cities where the air quality is very severely poor.
- Mention any two major causes of air pollution.
- Write any two harmful effects of air pollution to plants and humans.
- As a captain of your school Eco-club, suggest any two programmes you would plan to organise in the school so as to bring awareness among the students on how to check air pollution in and around the school.
Sunny was rushed to a nearby hospital after an accident, which had caused too much blood loss. The hospital failed to supply 'O' negative blood for transfusion. Ahmed, who was attending a patient there, heard about the situation and agreed to donate blood as he had the same blood group. Sunny's mother initially refused but was later convinced by her daughter's view.
- Why cannot 'O' positive blood be transfused into Sunny's body?
- What is the genetic basis of blood group inheritance?
- Human blood grouping is an example of?
- What values do you find in Sunny's sister and Ahmed?
What is meant by R cells and S cells with which Frederick Griffith carried out this experiments on Streptococcus pneumoniae? What did he prove from these experiments?
How can you, as an individual, prevent the loss of biodiversity?
Inbreeding.
Describe briefly Morgan’s Experiments showing linkage and crossing over. $($Diagram is not needed$)$
→Observe the representation of genes involved in the lac operon given below:
- Identify the region where the repressor protein will attach normally.
- Under certain conditions repressor is unable to attach at this site. Explain.
- If repressor fails to attach to the said site what products will be formed by z, y and a?
- Analyse why this kind of regulation is called negative regulation.
Performance enhancers.
Types of traits:
[Sickle-cell anaemia, Flower colour of Mirabelis jalapa, Coat colour of cattle, Human blood groups, Widow’s peak, Height in human beings.]
| Column A | Column B |
| (1) Co-dominance | —————– |
| (2) Incomplete dominance | —————– |
| (3) Multiple allelism | —————- |
| (4) Pleiotropy | —————– |
| (5) Polygenes | —————- |
| (6) Autosomal dominance | —————— |
- Draw the embryo sac of a flowering plant and label:
- Central cell
- Chalazal end of the embryo sac
- Synergids.
- Name the cell that develops into the embryo sac and explain how this cell leads to the formation of embryo sac. Also mention the role played by the various cells of the embryo sac.