Classify the following diseases as infectious or non-infectious.
(a) AIDS
(b) Tuberculosis
(c) Cholera
(d) High blood pressure
(e) Heart disease
(f) Pneumonia
(g) Cancer
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Which among the following diseases is not sexually transmitted?
(c) HIV - AIDS
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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)...
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What precautions could 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...
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Becoming exposed to or infected with an infectious microbe does not necessarily mean developing noticeable disease. Explain.
Because of strong immune system our body is normally fighting off microbes. We have cells which are specialised to kill the pathogenic microbes. These cells are active when infecting microbes...
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Elements with valency 1 are (a) always metals (b) always metalloids (c) either metals or non-metals (d) always non-metals
(c) either metals or non-metals
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Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
(a) Iodine (b) Bromine (c) Graphite (d) Carbon (e) Sulphur, phosphorus (f) Oxygen
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In which way has the study of biology helped us to control infectious diseases?
Various advancements that have occurred in the field of biology have helped us gain a better understanding to fight against various infectious diseases. Biology has helped us study the life...
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Name any two sexually transmitted diseases (STDs). How do these infectious diseases spread from one Person to another?
(i) The two sexually transmitted diseases (STDs) are gonorrhoea and syphilis. These infectious diseases spread from one person to another by sexual contact with an infected person. Two symptoms of STDs are...
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Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Opaque : A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a...
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Diseases are broadly grouped into infectious and non infectious diseases.
The correct answer is (d)ii and iv
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