Give reason: Infectious diseases are called communicable diseases.
Answer
Infectious diseases are caused by microbes. Microbes can spread in the community and thereby spread the disease. Infectious diseases are hence called communicable diseases.
Name the building blocks of living beings. What are they made of?
Answer
Cells: The first characteristic of a living thing is that, they are made up of cells. A cell is the basic building block of all organisms. It is the smallest unit of organization in a living thing. They contain the organism's hereditary information $(DNA)$ and can make copies of themselves in a process called mitosis.
What is correct? Wearing socks and full sleeves at night will prevent the attack from dengue.
Answer
Wearing socks and full sleeves at night will not prevent the attack from dengue as dengue spreads at day time. Dengue is caused by bite of Aedes aegypti mosquito which is active during day time only.
Aedes aegypti, the yellow fever mosquito, is a mosquito that can spread dengue fever, chikungunya, Zika fever, Mayaro and yellow fever viruses, and other diseases.
Name in which: Kissing does not spread the disease while sexual transfer the same.
Answer
The right answer is AIDS: Kissing does not spread the disease as saliva exchange does not transfer the virus. On the other hand sexual transfer leads to development of disease $AIDS.$
"A state of complete physical, mental and social well being and not merely the absence of disease or infirmity that enables one to lead socially and economically productive life is defined as health."
Name such a vaccine which saves the life of babies from three diseases.
Answer
$D.P.T.$ is a vaccine which is three-in-one. Babies should be immunised within the first six weeks of birth. It is the part of vaccination program. DPT: $D =$ Diphtheria, $P =$ Pertussis$($whooping cough$), T =$ Tetanus.
Noninfectious diseases are the ones which are produced by the factors other than living organisms and are incapable of spreading from one person to another. like high blood pressure.
Infectious diseases are diseases that are caused by pathogens and are capable of spreading from a diseased person to a healthy person. examples are flu and influenza.
Explain giving reasons: Our surrounding area should be free of stagnant water.
Answer
Mosquito breed their eggs in stagnant water. To keep our surrounding free from mosquito stagnant water should not be present. Controlling the population of mosquitoes is important to prevent diseases like malaria, dengue, chickenguniya etc.
Immunization: Immunization is the process whereby a person is made immune or resistant to an infectious disease, typically by the administration of a vaccine. Vaccines stimulate the body's own immune system to protect the person against subsequent infection or disease.