During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up. When thRead more
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up.
When this heated air rises, it expands and cools, which results in the condensation of water vapour forming water droplets. The presence of dust and other suspended particles in air also facilitates the process of condensation. The formation of water droplets leads to the formation of clouds.
An uneven heating of the Earth’s surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Then, air from a high pressure region moves to a low pressure region, causing wind. For more answers visit to website: https://www.tiwariacademyRead more
An uneven heating of the Earth’s surface causes winds. On being heated, air becomes lighter and
rises up. As a result, a region of low pressure is created. Then, air from a high pressure region
moves to a low pressure region, causing wind.
The atmosphere acts as a blanket by performing the following functions: (a) It keeps the average temperature of the Earth fairly constant during day time and even during the course of whole year. (b) It prevents a sudden increase in the temperature during day time. (c) It slows down the escape of heRead more
The atmosphere acts as a blanket by performing the following functions:
(a) It keeps the average temperature of the Earth fairly constant during day time and even
during the course of whole year.
(b) It prevents a sudden increase in the temperature during day time.
(c) It slows down the escape of heat from the surface of the Earth into outer space during
night time.
Earth’s atmosphere is different from those of Venus and Mars. This difference lies essentially in their compositions. Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on ERead more
Earth’s atmosphere is different from those of Venus and Mars. This difference lies essentially in
their compositions. Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small
fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%.
Introduction of mild type of infection (microbes) or killed infectious microbes into the body by vaccination / by other means to activate the immune system against a particular infection / disease is called immunization. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutionRead more
Introduction of mild type of infection (microbes) or killed infectious microbes into the body by
vaccination / by other means to activate the immune system against a particular infection / disease is called immunization.
Immunization programme (i) BCG vaccine against tuberculosis. (ii) Polio drops against polio. (iii) Vaccination against chicken pox. (iv) Vaccination against Hepatitis. (v) DPT vaccination against diptheria, pertusis (whooping cough) and tetanus. (vi) Immunisation against measles. Major health probleRead more
Immunization programme
(i) BCG vaccine against tuberculosis.
(ii) Polio drops against polio.
(iii) Vaccination against chicken pox.
(iv) Vaccination against Hepatitis.
(v) DPT vaccination against diptheria, pertusis (whooping cough) and tetanus.
(vi) Immunisation against measles.
Major health problems are (i) Hepatitis, (ii) Chicken pox, (iii) Tuberculosis and (iv)Tetanus
(i) Preventing over crowing classes, (ii) Providing safe drinking water, (iii) Cleanliness in the school premises and also in the classroom, (iv) Use of handkerchief or towel while an infected student in sneezing or coughing, (v) Use of clean toilets, (vi) Not to allows water to stagnate in school oRead more
(i) Preventing over crowing classes,
(ii) Providing safe drinking water,
(iii) Cleanliness in the school premises and also in the classroom,
(iv) Use of handkerchief or towel while an infected student in sneezing or coughing,
(v) Use of clean toilets,
(vi) Not to allows water to stagnate in school or around the school to avoid mosquito breeding,
(vii) To get vaccinated whenever programmers organized for inoculation against various diseases.
(viii) Not eating food exposed to flies, mosquitoes etc.
Infection causing microbes travel from patient to person through: (i) Air: Sneezing or coughing since little droplets are thrown which they reach another person through air. Example, common Cole, pneumonia etc. (ii) Water: contaminated water carries disease causing microbes which cause infection onRead more
Infection causing microbes travel from patient to person through:
(i) Air: Sneezing or coughing since little droplets are thrown which they reach another person
through air. Example, common Cole, pneumonia etc.
(ii) Water: contaminated water carries disease causing microbes which cause infection on its
usage. Example, diseases such as cholera.
(iii) Sexual contact: Diseases such as syphilis or AIDS are transmitted by sexual contact from one
person to the other.
(iv) Animals: These are intermediaries, called vectors, transmitting diseases from a patient to the
host. Example, mosquitoes (Female Anopheles mosquito) cause spread of malaria.
Infectious disease show a lack of success of the immune system of the body. For the functioning of immune system properly, sufficient nourishment and easily digestible food is necessary for a sick person. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/sciencRead more
Infectious disease show a lack of success of the immune system of the body. For the functioning
of immune system properly, sufficient nourishment and easily digestible food is necessary for a
sick person.
Jaundice because it is a chronic disease and takes long time to be cured. Moreover, jaundice affects the whole body and it takes long time to be healthy. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
Jaundice because it is a chronic disease and takes long time to be cured. Moreover, jaundice affects the whole body and it takes long time to be healthy.
How are clouds formed?
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up. When thRead more
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up.
When this heated air rises, it expands and cools, which results in the condensation of water vapour forming water droplets. The presence of dust and other suspended particles in air also facilitates the process of condensation. The formation of water droplets leads to the formation of clouds.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
What causes winds?
An uneven heating of the Earth’s surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Then, air from a high pressure region moves to a low pressure region, causing wind. For more answers visit to website: https://www.tiwariacademyRead more
An uneven heating of the Earth’s surface causes winds. On being heated, air becomes lighter and
rises up. As a result, a region of low pressure is created. Then, air from a high pressure region
moves to a low pressure region, causing wind.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
How does the atmosphere act as a blanket?
The atmosphere acts as a blanket by performing the following functions: (a) It keeps the average temperature of the Earth fairly constant during day time and even during the course of whole year. (b) It prevents a sudden increase in the temperature during day time. (c) It slows down the escape of heRead more
The atmosphere acts as a blanket by performing the following functions:
(a) It keeps the average temperature of the Earth fairly constant during day time and even
during the course of whole year.
(b) It prevents a sudden increase in the temperature during day time.
(c) It slows down the escape of heat from the surface of the Earth into outer space during
night time.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
How is our atmosphere different from the atmospheres on Venus and Mars?
Earth’s atmosphere is different from those of Venus and Mars. This difference lies essentially in their compositions. Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on ERead more
Earth’s atmosphere is different from those of Venus and Mars. This difference lies essentially in
their compositions. Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small
fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
What is immunization?
Introduction of mild type of infection (microbes) or killed infectious microbes into the body by vaccination / by other means to activate the immune system against a particular infection / disease is called immunization. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutionRead more
Introduction of mild type of infection (microbes) or killed infectious microbes into the body by
vaccination / by other means to activate the immune system against a particular infection / disease is called immunization.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
What are the immunization programs available at the nearest health center in your locality? Which of these diseases are the major health problems in your area?
Immunization programme (i) BCG vaccine against tuberculosis. (ii) Polio drops against polio. (iii) Vaccination against chicken pox. (iv) Vaccination against Hepatitis. (v) DPT vaccination against diptheria, pertusis (whooping cough) and tetanus. (vi) Immunisation against measles. Major health probleRead more
Immunization programme
(i) BCG vaccine against tuberculosis.
(ii) Polio drops against polio.
(iii) Vaccination against chicken pox.
(iv) Vaccination against Hepatitis.
(v) DPT vaccination against diptheria, pertusis (whooping cough) and tetanus.
(vi) Immunisation against measles.
Major health problems are (i) Hepatitis, (ii) Chicken pox, (iii) Tuberculosis and (iv)Tetanus
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
What precautions can you take in your school to reduce the incidence of infectious diseases?
(i) Preventing over crowing classes, (ii) Providing safe drinking water, (iii) Cleanliness in the school premises and also in the classroom, (iv) Use of handkerchief or towel while an infected student in sneezing or coughing, (v) Use of clean toilets, (vi) Not to allows water to stagnate in school oRead more
(i) Preventing over crowing classes,
(ii) Providing safe drinking water,
(iii) Cleanliness in the school premises and also in the classroom,
(iv) Use of handkerchief or towel while an infected student in sneezing or coughing,
(v) Use of clean toilets,
(vi) Not to allows water to stagnate in school or around the school to avoid mosquito breeding,
(vii) To get vaccinated whenever programmers organized for inoculation against various diseases.
(viii) Not eating food exposed to flies, mosquitoes etc.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
What are the different means by which infectious diseases are spread?
Infection causing microbes travel from patient to person through: (i) Air: Sneezing or coughing since little droplets are thrown which they reach another person through air. Example, common Cole, pneumonia etc. (ii) Water: contaminated water carries disease causing microbes which cause infection onRead more
Infection causing microbes travel from patient to person through:
(i) Air: Sneezing or coughing since little droplets are thrown which they reach another person
through air. Example, common Cole, pneumonia etc.
(ii) Water: contaminated water carries disease causing microbes which cause infection on its
usage. Example, diseases such as cholera.
(iii) Sexual contact: Diseases such as syphilis or AIDS are transmitted by sexual contact from one
person to the other.
(iv) Animals: These are intermediaries, called vectors, transmitting diseases from a patient to the
host. Example, mosquitoes (Female Anopheles mosquito) cause spread of malaria.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
Why are we normally advised to take bland and nourishing food when we are sick?
Infectious disease show a lack of success of the immune system of the body. For the functioning of immune system properly, sufficient nourishment and easily digestible food is necessary for a sick person. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/sciencRead more
Infectious disease show a lack of success of the immune system of the body. For the functioning
of immune system properly, sufficient nourishment and easily digestible food is necessary for a
sick person.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?
Jaundice because it is a chronic disease and takes long time to be cured. Moreover, jaundice affects the whole body and it takes long time to be healthy. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/
Jaundice because it is a chronic disease and takes long time to be cured. Moreover, jaundice affects the whole body and it takes long time to be healthy.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-13/