Describe the different steps in the sexual mode of reproduction in the life cycle of a malarial parasite from the time of its initiation till where it is completed and ready to start a fresh cycle.
Show Hint
The sexual reproduction phase of Plasmodium occurs in mosquitoes, making them the definitive hosts of the parasite.
Solution and Explanation
Gametocytes: Male and female gametocytes are ingested by a mosquito during a blood meal.
Fertilization: Gametocytes fuse in the mosquito's gut to form a zygote.
Development: The zygote develops into an ookinete, which penetrates the gut wall and forms an oocyst.
Sporozoites: The oocyst releases sporozoites that migrate to the mosquito's salivary glands, ready to infect a new host.
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- Write the symptoms of malaria in human and explain what causes these symptoms.
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- Environment
Read the following characteristics of retail trading carefully and choose the correct option:
I. This is concerned with the sale of goods directly to the consumers.
II. Most of the retail trading takes place in fixed establishments or stores.
III. It is formed by many middlemen, traders, and suppliers.
IV. Hawkers, street peddling, automatic vending machines, etc., are its examples.
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- The Earth: Our Habitat
Read the programmes related to the proposed Bharatmala umbrella scheme carefully and choose the correct option:
I. Backward areas, religious and tourist places connectivity programme
2. To interconnect the four metropolitan cities of the country
3. To develop State roads in adjoining coastal areas
4. To connect non-major ports in coastal states
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Write a user-defined function in Python named showGrades(S) which takes the dictionary
Sas an argument. The dictionaryScontains Name: [Eng, Math, Science] as key:value pairs.
The function displays the corresponding grade obtained by the students according to the following grading rules:
\[ \begin{array}{|c|c|} \hline \textbf{Average of Eng, Math, Science} & \textbf{Grade} \\ \hline \geq 90 & A \\ \hline < 90 \text{ but } \geq 60 & B \\ \hline < 60 & C \\ \hline \end{array} \]
Example: Consider the following dictionary: \[ S = \{\text{"AMIT"}: [92, 86, 64], \text{"NAGMA"}: [65, 42, 43], \text{"DAVID"}: [92, 90, 88]\} \] The output should be: \[ \text{AMIT} - B \\ \text{NAGMA} - C \\ \text{DAVID} - A \]- CBSE CLASS XII - 2024
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