Hi Everyone!! This article will share The World At Our Fingertips Questions & Answers.
In my previous posts, I have shared the questions and answers of Without Glasses, The Mahatma’s Worksheets and Tangerine The Wasp so, you can check these posts as well.
The World At Our Fingertips Questions & Answers
Question 1: Fill in the blanks with suitable words.
(a) the most sensitive parts of the skin are in our hands and lips.
(b) the skin on our back has fewer receptors than the skin on our fingers.
(c) there are more touch receptors on our hands than on our thighs.
(d) in the braille each letter is represented by a pattern of embossed dots.
(e) wherever there are more touch receptors, the skin is more sensitive.
(f) the ingredient in chilli which creates the hot sensations is capsaicin.
(g) the receptors in the skin send messages to the brain.
Question 2: The skin in our fingers can distinguish and discriminate between many different sensations. Give one example for each of the following capacities of the skin:
(a) Distinguishing between silky and coarse.
Answer: Touching a satin scarf and running your hand over sand at the beach.
(b) Distinguishing between soft and hard.
Answer: Picking up and pressing some cotton and pressing a rock.
(c) Distinguishing between firm and loose.
Answer: Pressing an unripe mango and pressing an over-ripe mango.
(d) Distinguishing between different patterns.
Answer: We can identify different letters if they are embossed on paper simply by touching them. If someone were to trace a letter on our back, we usually are able to tell which letter it is.
Question 3: Describe two ways in which the skin protects us from harm.
Answer: The skin on our hands helps us feel if an object is hard or soft, and therefore, chewable. It prevents us from putting hard things in our mouth, which cannot be chew and will hurt our tongue and teeth. Our skin also helps us tell if the temperature is too hot or cold. This helps us avoid extremes of temperature, which are not good for the working of the human body.
Question 4: Explain the following sensations:
(a) We feel hot when we eat a chilli.
Answer: Chilli contains the chemical ‘capsaicin’ which activates the heat receptor in our brain.
(b) We have a cool feeling when we suck a throat lozenge.
Answer: Throat lozenges contain ‘menthol’ which is a chemical that affects the receptor for coldness in our brain, making it feel cold.
Question 5: If we did not have so many sensors in our lips and tongue, what would be the consequences?
Answer: If we did not have a high density of receptors in our lips and tongue, we would be unable to tell if the things we put in out mouth are hard or too hot or cold, causing damage to our teeth, mouth and digestive tracts. We would also not be able to tell the difference between fresh and stale food, without knowing the taste.
Question 6: People without sight are able to read using their fingers. How do people who cannot hear manage to communicate with others?
Answer: People who cannot hear can read and write, in order to communicate with other people. However, if they are in the company of others who have been trained in sign language, they can use it to have conversations effortlessly.
So, these were The World At Our Fingertips Questions & Answers.