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A Treat for Mosquitoes Class 5 Notes CBSE EVS Chapter 8 (Free PDF Download)

Last updated date: 03rd Mar 2024
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A Treat for Mosquitoes Revision Notes and Worksheets: Learn from Simpler Explanation and Prepare Well

Chapter 8 of Class 5 EVS introduces children to the diseases caused by mosquito bites. It also explains how blood tests are done for checking which kind of pathogen is affecting the health of an infected person. Chapter 8 describes how to identify a mosquito bite. Children will also learn what other diseases are related to blood that are not caused by mosquitoes. To understand the summary of this chapter, refer to the A Treat for Mosquitoes revision notes prepared by the experts.

The subject experts have prepared these notes in a simpler version so that you can understand the concepts well and prepare this chapter easily. A Treat for Mosquitoes summary in these notes will explain all the concepts and facts precisely.

Class 5 EVS Revision Notes - Chapter-wise List

The class 5 EVS notes will help students prepare better for their examinations. They are prepared by experts and are in accordance with the latest CBSE syllabus and guidelines.

Access Class 5 Environmental Studies Chapter 8: A Treat for Mosquitoes

Summary of A Treat for Mosquitoes

  • A Treat for Mosquitoes talks about the insect that is found in everyone's home, the mosquito.

  • Although a mosquito is a small bug, it has the potential to kill a person. 

  • Furthermore, it can spread severe infections like malaria and dengue fever, which can lead to death.

  • Blood tests, anaemia, Baby mosquitoes, mosquito check, and other topics are covered in A Treat for Mosquitoes.

  • Thus, by attentively studying these issues, students will have a sufficient understanding of mosquitoes and their lives.

Blood Test

  • A blood test that counts different types of blood cells or measures the number of chemicals in the blood. 

  • Blood tests may be performed to seek for symptoms of disease or disease-causing chemicals, to check for antibodies or tumour markers, or to assess the effectiveness of therapies.

How is Blood Test Taken?

  • The vein is pierced with a needle linked to a syringe.

  • A syringe is used to extract a sample of blood from you.

  • The doctor next examines the blood under a microscope, magnifying it a thousand times.


  • Malaria is an infectious disease transmitted by mosquito bites (Anopheles Stephensi). Malaria symptoms normally occur 10 to 30 days after a person has been infected.

Signs and Symptoms of Malaria

Malaria has symptoms that are similar to those of the flu. They are as follows:

  • Fever and perspiration.

  • Chills that run through your entire body.

  • Muscle pains and headaches

  • Fatigue.

  • Cough, chest pain, and breathing difficulty

  • Diarrhea, nausea, and vomiting are all symptoms.

Medicine for Malaria

  • The dried and powdered bark of the Cinchona tree has been used to treat malaria since ancient times.

  • Previously, people would boil the bark powder and sieve the water before giving it to patients. 

  • This is now used to make tablets.


It is a condition in which there are insufficient healthy red blood cells to carry an adequate amount of oxygen to the body's tissues.


  • Haemoglobin is an iron-containing protein found in red blood cells. 

  • It transports oxygen throughout the human body. 

  • Apart from white-blooded fish, all vertebrates have haemoglobin in their red blood cells. It can also be found in invertebrates.

  • For men, a healthy haemoglobin range is 13.2 to 16.6 grammes per decilitre. 11.6 to 15 grammes per decilitre for women.

Anaemia Common in Delhi School

  • November 17th, 2007 - Thousands of youngsters in Delhi Municipal Corporation schools are anaemic. 

  • This has a negative impact on both their physical and emotional wellbeing. 

  • Children with anaemia do not grow properly and have poor energy levels. 

  • This has an impact on their capacity to study effectively. 

  • Health screenings are now conducted in schools, and health cards are issued to all students.

  • Iron pills are also given to anaemic children.

What are the Diseases Caused by Houseflies?

Houseflies are known to carry a variety of dangerous and potentially fatal diseases, including:

  • Cholera

  • Conjunctivitis

  • Dysentery

  • Gastroenteritis

  • Salmonellosis

  • Shigellosis

  • Tuberculosis

  • Typhoid fever

How Can we Prevent Malaria?

  • Allowing water to collect around your home is not a good idea. Fill the pits with water.

  • Maintain the cleanliness of the water pots, coolers, and tanks. Every week, they should be dried.

  • Protect yourself with mosquito netting.

  • If water has accumulated in an area, spray it with kerosene.

Mosquitoes Larvae

They have a big head and thorax, as well as a narrow, wormlike abdomen, and they usually float just below the water's surface, breathing through tubes at the end of the abdomen.

  • Larvae eat microorganisms that live in the water. 

  • The larva develops into a pupa after three moults. 

  • Pupae will continue to develop until the newly formed adult flying mosquito's body emerges from the pupal skin and leaves the water.

What are Algae?

  • In addition to ponds, brackish waters, and even snow, algae can be found in rivers, lakes, oceans, and ponds.

  • Algae are usually green, but they can be found in a variety of different colours.

  • Photosynthetic organisms include algae.

  • Multicellular or unicellular organisms can be classified as algae.

  • Because algae don't have a clearly defined body, they lack structures like roots, stems, and leaves.

  • Where there is enough moisture, algae can grow.

  • Both asexual and sexual forms of reproduction are present in algae. By producing spores, asexual reproduction takes place.

  • Algae can form symbiotic relationships with other organisms, but most are independent living things.

A scientist Peeps into a Mosquito’s Stomach

  • This fascinating incident occurred about a century ago. 

  • Malaria is spread by mosquitoes, according to a scientist.

  • Ronald Ross' father served in the Indian army. He wanted to be a doctor, so he went to school for it. 

  • Thousands of people died from a sickness that is now known as malaria back then. The disease was discovered in areas with a lot of rain or in swampy areas. 

  • The sickness was considered to be caused by a noxious gas that originated from the filthy swampy surroundings. 

  • They called it ‘malaria,' which means 'poor air.'

  • When a doctor examined one of the patients' bloods under a microscope, he noticed small bacteria. But he couldn't figure out how they'd gotten into the patient's bloodstream.

  • He spent most of my time chasing mosquitoes, catching and observing them. They used to chase mosquitos around with empty bottles in their hands.

  • He'd be bending over the microscope for hours on end.

  • He searched for months with the microscope but came up empty-handed. They collected a few mosquitoes that looked unusual one day. 

  • They have brownish wings with speckled patterns. He noticed something black in the guts of one of the female mosquitoes as he glanced inside. He took a closer look. He noticed that these microscopic germs resembled those found in the blood of malaria sufferers. 

  • Finally, they had proof! Malaria was carried via mosquitoes!"

  • Ronald Ross received the Nobel Prize for Medicine in December 1902 for his discovery.

Practice Questions

1. Multiple Choice Questions (MCQs). 

(i) How much blood is needed to test for malaria? 

  1. 2-3 drops 

  2. Half a syringe  

  3. Full syringe

  4. Blood is not required 

Ans: (A) 2-3 drops

(ii) From early times which tree bark was used to prepare medicine for malaria? 

  1. Teak  

  2. Kadamb 

  3. Coral Tree 

  4. Cinchona 

Ans: (D) Cinchona

Q 2. Answer the following questions. 

(Image will be uploaded soon)

  1. Identify the great scientist in the picture. 

Ans: Ronald Ross

  1. What contribution has he made in the field of science? 

Ans: Discovered the mosquito which causes malaria.

Q3. It is advised not to eat cut or uncovered food items. Give reasons.

Ans: Food that is old or unprotected contains a lot of dangerous bacteria that can infect our bodies and cause diseases. So, we should refrain from consuming expired or exposed food.

Q4. Anaemia is caused by the deficiency of

  1. Calcium  

  2. Iron  

  3. Vitamin A  

  4. Vitamin D 

Ans: Anaemia is caused by the deficiency of Iron in the human body. So, the option B is correct.

Q5. In which season is malaria more common? 

  1. Summer  

  2. Winter  

  3. Spring  

  4. Monsoon

Ans: In the season of Monsoon the disease Malaria becomes more common. So, the option D is correct.

Importance of CBSE Class 5 EVS Chapter 8 A Treat for Mosquitoes

This chapter teaches students how people fall ill due to mosquito bites. They will learn what kind of diseases are caused by mosquitoes. They will also learn how blood tests are performed to check what kind of pathogens is present in the blood sample of an infected person. You will also learn the answer to ‘how do mosquitoes find us?’

Students of Class 5 will also learn in which season malaria is more common. There are many diseases that spread through mosquito bites. The mosquitoes lay eggs in the containers that accumulate rainwater. It also explains how we can get rid of such misquotes and what precautions should be taken to avoid such mosquitoes from biting.

The chapter is important as it teaches students to find out a mosquito solution to the different problems and stop these diseases from spreading in the locality.

Benefits of Vedantu’s A Treat for Mosquitoes Class 5 Worksheets and Revision Notes

  • The revision notes are the ideal study material you need to complete preparing this chapter. The simpler explanation given in this chapter will help you understand the concepts related to diseases.

  • You will learn how pathogens are transferred to a host from mosquito bites and what to do to avoid them. Class 5 EVS A Treat for Mosquitoes will help you understand the scientific reasons behind blood diseases such as anaemia. This type of disease is not caused by any pathogen. It happens due to malnutrition.

  • Recall the concepts you have studied using the notes and prepare well before an exam. It will help you to remember answers to the questions such as ‘Do you know anyone who has had malaria?’

Download A Treat for Mosquitoes Revision Notes and Worksheets PDF

Get the free PDF version of the revision notes and worksheets to complete your study material for this chapter. Learn how the experts have given the answers to worksheet questions from the NCERT Class 5 EVS solution. Escalate your answering skills following the formats used in the solutions and score more in the exams.


Vedantu's free PDF notes on CBSE Class 5 EVS Chapter 8, "A Treat for Mosquitoes," provide a valuable educational resource for young learners. These notes offer a comprehensive understanding of the ecological aspects related to mosquito control, aligning seamlessly with the CBSE curriculum. Vedantu's commitment to providing accessible educational content empowers students to grasp the complexities of environmental science with ease. These notes simplify intricate concepts, encourage critical thinking, and foster a deeper appreciation for responsible environmental practices. By utilizing these resources, students can enhance their knowledge, environmental awareness, and overall academic performance while becoming conscientious stewards of the environment, contributing to a healthier and more sustainable world.

FAQs on A Treat for Mosquitoes Class 5 Notes CBSE EVS Chapter 8 (Free PDF Download)

1. Why do people develop anaemia?

Anaemia is a blood disease that happens due to malnutrition. When a person lacks iron, they develop anaemia.

2. How do we test for certain fevers?

When a person is suffering from fever for a few days, doctors ask them to get their blood checked. A sample is drawn from the person’s vein. It is then tested under a microscope to find pathogens and conclude which disease is causing the fever.

3. Why should we overturn empty vessels kept outdoors?

Empty vessels should be overturned when kept outside so that they do not accumulate rainwater and become a breeding zone for mosquitoes.