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
Read the following passage and answer the questions that follow. Prevention is the frontline response to drug use. Effective interventions address the underlying conditions contributing to drug use, such as a lack of connection to family or community, instability, insecurity, trauma, mental health issues, etc. When addressed, these factors can effectively prevent the initiation of drug use and the progression to drug use disorders. Study the few key figures of drug use given below and answer the questions that follow.
(a) What do you infer from the figures in Table No. 1 about the people with drug use disorders, 2022 (in million)? State any two of your observations.
(b) How are Hepatitis C and HIV related to drug use disorders by people, as shown in Table No. 2? State the correlation between the two.
(c)
- [(i)] Give the scientific name of (p) shown in Table No. 1.
OR - [(ii)] Give the scientific name of (q) shown in Table No. 1.
- CBSE CLASS XII - 2025
- Biology
- Human health and disease
- [(i)] Give the scientific name of (p) shown in Table No. 1.
- Explain unique features of acquired immunity.
- Maharashtra Class XII - 2025
- Biology
- Human health and disease
- Which of the following is caused by unsterilized needle?
- Maharashtra Class XII - 2025
- Biology
- Human health and disease
- In the life cycle of a {Plasmodium, once the sporozoite enters the blood of the host, it invades the hepatic portal system, resulting in occurrence of change in the host body, leading to malaria
A. Sporozoite enters the hepatocytes and divides by schizogony leading to formation of cryptomerozoites
B. Inside RBCs, the micro-metacryptozoites become rounded and modify into a young trophozoites.
C. As the trophozoite grows in size, a central vacuole is developed so that the nucleus is pushed to one side into the peripheral cytoplasm, leading to amoeboid stage.
D. In Amoeboid stage the small red eosinophils granules appear in the cytoplasm of the host corpulses as Schuffner's granules}
Choose the most appropriate answer from the options given below:- CUET (PG) - 2025
- Zoology
- Human health and disease
- Match LIST-I with LIST-II
\begin{tabularx}{0.8\textwidth}{|l|X|l|X|} \hline \multicolumn{2}{|c|}{LIST-I} & \multicolumn{2}{c|}{LIST-II}
\multicolumn{2}{|c|}{Types Cancer} & \multicolumn{2}{c|}{Tissues involved}
\hline A. & Carcinoma & I. & Muscle
B. & Chondroma & II. & Cartilage
C. & Sarcoma & III. & Blood
D. & Myeloma & IV. & Epithelial Tissue
\hline \end{tabularx}
Choose the most appropriate answer from the options given below:- CUET (PG) - 2025
- Zoology
- Human health and disease
Questions Asked in CBSE CLASS XII exam
- A charge \( -6 \mu C \) is placed at the center B of a semicircle of radius 5 cm, as shown in the figure. An equal and opposite charge is placed at point D at a distance of 10 cm from B. A charge \( +5 \mu C \) is moved from point ‘C’ to point ‘A’ along the circumference. Calculate the work done on the charge.
- CBSE CLASS XII - 2025
- Electrostatics
- Calculate the value of Net Value Added at Factor Cost (NVA\textsubscript{FC}):
S. No. Particulars Amount (in ₹ crore) (i) Operating Surplus 3,740 (ii) Increase in unsold stock 600 (iii) Sales 10,625 (iv) Purchase of raw materials 2,625 (v) Consumption of fixed capital 500 (vi) Subsidies 400 (vii) Indirect taxes 1,200 - CBSE CLASS XII - 2025
- National Income Accounting
- How does Charley describe himself? (The Third Level)
- CBSE CLASS XII - 2025
- The third level
- A parallel plate capacitor with plate area \( A \) and plate separation \( d \) has a capacitance \( C_0 \). A slab of dielectric constant \( K \) having area \( A \) and thickness \( \left(\frac{d}{4}\right) \) is inserted in the capacitor, parallel to the plates. Find the new value of its capacitance.
- CBSE CLASS XII - 2025
- capacitor with a dielectric
- You are Kirti / Keshav of 7, M.G. Road, Jhansi. You are disturbed by students littering parks during one-day picnics. Write a letter to the editor of a national daily suggesting ways to inculcate civic sense among students. Use the given cues to draft the letter.
- CBSE CLASS XII - 2025
- Writing Skills