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 lose 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.”
Explain the events which occur within a female Anopheles mosquito after it has sucked blood from a malaria patient.
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 lose 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.”
Explain the events which occur within a female Anopheles mosquito after it has sucked blood from a malaria patient.
Show Hint
The life cycle of Plasmodium involves complex stages within the mosquito’s gut, leading to the formation of infectious sporozoites.
Solution and Explanation
The gametocytes of Plasmodium ingested with human blood develop into gametes in the mosquito’s gut. Fertilisation occurs, forming a zygote which develops into an ookinete and then into an oocyst. The oocyst releases sporozoites which migrate to the mosquito’s salivary glands, ready to infect another human.
Top Questions on Human health and disease
- Transplantation of tissues/organs to some patients often fails due to rejection by the body of the patient. Which type of immune response is responsible for such rejections?
- CBSE CLASS XII - 2025
- Biology
- Human health and disease
Study a part of life cycle of Plasmodium given below:
Answer the following questions:
(a) Name the infective stage of Plasmodium that is stored in the female Anopheles mosquito.
(b) Where does fertilization and development of parasite take place?
(c) Identify labels P and Q in the given diagram.
(d) Asexual and sexual phase of the life cycle of the Plasmodium takes place in two different hosts. Write their names.- CBSE CLASS XII - 2025
- Biology
- Human health and disease
- (A) How are morphine and heroin related? Mention their effect on the human body.
- CBSE CLASS XII - 2025
- Biology
- Human health and disease
- If a person is positive in Widal test, then that person is infected by which pathogen?
- CBSE Compartment XII - 2025
- Biology
- Human health and disease
- In which of the following conditions/diseases is there a substantial increase in the activity of mast cells observed in the human body?
- CBSE Compartment XII - 2025
- Biology
- Human health and disease
Questions Asked in CBSE CLASS XII exam
- A meeting will be held only if all three members A, B and C are present. The probability that member A does not turn up is 0.10, member B does not turn up is 0.20 and member C does not turn up is 0.05. The probability of the meeting being cancelled is:
- CBSE CLASS XII - 2025
- Probability
- If $A = \begin{bmatrix} 2 & 3 \\ -1 & 2 \end{bmatrix}$, then show that $A^2 - 4A + 7I = 0$.
- Reactant ‘A’ underwent a decomposition reaction. The concentration of ‘A’ was measured periodically and recorded in the table given below:Based on the above data, predict the order of the reaction and write the expression for the rate law.
Time (Hours) [A] (M) 0 0.40 1 0.20 2 0.10 3 0.05 - CBSE CLASS XII - 2025
- Chemical Kinetics
- ‘But the game he is watching so intently is out of his reach.’ What are the factors that have made their game inaccessible to Saheb? (Lost Spring)
- CBSE CLASS XII - 2025
- Literature
- Calculate the mass of an $\alpha$-particle in atomic mass unit (u).
Given: Mass of a normal helium atom = \( 4.002603 \ \text{u} \)
Mass of carbon atom = \( 1.9926 \times 10^{-26} \ \text{kg} \)
- CBSE CLASS XII - 2025
- Atoms and Nuclei