Case Study Questions for Class 8 Science Chapter 2 Microorganisms-Friend and Foe

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Home CBSE Class 8 Science Case Study Qs Case Study Questions for Class 8 Science Chapter 2 Microorganisms-Friend and Foe

Case Study Questions for Class 8 Science Chapter 2 Microorganisms-Friend and Foe

Here we are providing case study questions for CBSE Class 8 science Chapter 2 Microorganisms-Friend and Foe.

Case Study Questions

Question 1:

Daksh lived in delhi and he loves to play football. But as of now his half yearly exams were going on so his mother didn’t allow him to go out and play. She promised Daksh that as soon as his exams are over he can go and play. Post exams he went out to play football with his friends in the park. Suddenly a mosquito bit him under his left knee. He came home and everything was normal that time. The next day his health started getting affected. His Parents rushed him to the doctor. The doctor prescribed some medicines and some medical tests. The next day parents went to the doctor with Daksh’s medical report. In that report the platelet counts were very low. The doctor diagnosed him with Dengue fever. Daksh was hospitalised for some time and followed a strict diet to recover as early as possible. And eventually some days passed and he recovered.

Q. 1. Organisms which cannot be seen by naked eye.
(a) Plants
(b) Animals
(c) Microorganisms
(d) None of these

➢ Show Answer Ans. Option (c) is correct.
Explanation: Microorganisms are the living organisms that are very minute to be seen by naked eye that can be seen only through microscope. Microorganisms include bacteria, algae, fungi and protozoa.

Q. 2. The causative organisms of dengue is
(a) Anopheles mosquito
(b) Aedes aegypti mosquito
(c) Dengue virus
(d) None of these

➢ Show Answer Ans. Option (b) is correct.
Explanation: Dengue is a mosquito borne viral disease caused by the dengue virus and transmitted by female mosquito Aedes aegypti.

Q. 3. How does dengue virus spread?

➢ Show Answer Ans. Dengue is a viral infection transmitted to humans through the bite of mosquitoes. It is caused by the bite of female mosquito Aedes aegypti. The mosquito becomes infected when it takes the blood of a person infected with the virus. After about one week, the mosquito can then transmit the virus while biting a healthy person. These mosquitoes generally bite during day time and are found everywhere. Headache, high fever, vomiting are some symptoms of dengue.

Q. 4. Write any three preventive measures for dengue fever.

➢ Show Answer Ans. (i) Use mosquito repellents and wear long sleeved clothes and full pants before going outside the house
(ii) Do not let water stagnate anywhere, reduce the mosquito habitat.
(iii) Sleeping under the mosquito net protects from being bitten by mosquitoes.

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