Biology Chapter 10: Human Ear and Hearing

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Questions and Answers

What is the primary function of the parts of the internal ear indicated in Figure 2.12?

To maintain body balance

What is the result of structural deformities or diseases of the ears?

Deafness

What is the function of chemoreceptors in the tongue?

To detect taste

What is the purpose of a hearing aid?

To amplify sound Signup and view all the answers

What is the role of saliva in the detection of taste?

It stimulates the chemoreceptors Signup and view all the answers

What are the small projected structures seen on the surface of the tongue?

Papillae Signup and view all the answers

What is the primary organ affected by tuberculosis?

Lungs Signup and view all the answers

How does the Mycobacterium tuberculosis pathogen spread to others?

When the patient speaks, coughs, or sneezes Signup and view all the answers

What is the purpose of the BCG vaccine?

To prevent tuberculosis Signup and view all the answers

What is the characteristic feature of a virus?

It has a simple structure with a DNA or RNA molecule within a protein coat Signup and view all the answers

How does a virus multiply?

By taking control over the genetic mechanism of the host cells Signup and view all the answers

What type of disease is Nipah?

Viral disease Signup and view all the answers

What is the primary cause of cretinism?

Deficiency of thyroxine during the foetal stage or infancy Signup and view all the answers

Which of the following symptoms is NOT associated with myxoedema?

Increased heart rate Signup and view all the answers

What is the main function of iodine in relation to thyroxine?

Essential for the production of thyroxine Signup and view all the answers

Which of the following conditions is characterized by a high metabolic rate and weight loss?

Hyperthyroidism Signup and view all the answers

What is the effect of thyroxine deficiency on the body?

Sluggishness and weight gain Signup and view all the answers

What is the term for the enlargement of the thyroid gland due to iodine deficiency?

Goitre Signup and view all the answers

Which of the following is NOT a mode of transmission of HIV?

Through touch or shaking hands Signup and view all the answers

What is the major symptom of Hepatitis?

Inflammation of the liver Signup and view all the answers

Which of the following diseases is transmitted through mosquitoes?

Dengue fever and Chikungunya Signup and view all the answers

What is the cause of an increase in the level of bilirubin in blood in Hepatitis?

Blockage of the flow of bile secreted by the liver Signup and view all the answers

Which of the following is a common symptom of Hepatitis?

Dark yellow color of the mucus membrane, white portion of the eyes and the nails Signup and view all the answers

What is a mode of transmission of certain types of Hepatitis?

Through contaminated food and water Signup and view all the answers

What is a common scenario that can lead to the spread of various communicable diseases?

Existence of conditions suitable for the multiplication and transmission of pathogens Signup and view all the answers

What is the primary mode of transmission of diseases depicted in Illustration 4.1?

Cough, sneezing, and contact Signup and view all the answers

What is a significant consequence of floods in terms of disease spread?

Increased risk of rat fever and other communicable diseases Signup and view all the answers

What is the role of microorganisms in the context of diseases?

Some microorganisms are pathogens, while others are beneficial Signup and view all the answers

What is a crucial step in preventing the spread of communicable diseases in flood-affected areas?

Improving sanitation and hygiene facilities Signup and view all the answers

What is a potential outcome of inadequate disease prevention measures in flood-affected areas?

Outbreak of communicable diseases, including rat fever Signup and view all the answers

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