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Question 1 of 5
1. Question
2 points1. Genetic disorders are conditions that are caused by a change or mutation in an individual’s genetic makeup. These changes can occur in the DNA sequence of a gene, or in the number or structure of chromosomes. Which of the following are genetic disorders?
1. Cystic Fibrosis
2. Haemophilia
3. Down syndrome
4. Colour blindness
Select the correct answer using code given below:Correct
Answer: D
Explanation:
● Cystic Fibrosis: This is a single-gene disorder that affects the transport of salt and water in and out of cells, leading to the formation of thick, sticky mucus in the lungs and other organs. This can cause chronic lung infections, difficulty breathing, and malnutrition. This disorder is caused by a mutation in the CFTR gene and it is also an autosomal recessive disorder.
● Hemophilia:It is a rare disorder in which the blood doesn’t clot in the typical way because it doesn’t have enough blood-clotting proteins (clotting factors). Most people who have hemophilia are born with it. It almost always is inherited (passed down) from a parent to a child.
● Down Syndrome: This is a chromosomal disorder that occurs when an individual has an extra copy of chromosome 21. This results in physical and intellectual developmental delays, as well as characteristic facial features such as a small head, upward slanting eyes and a flat facial profile.
● Colour blindness: In the majority of cases, colour vision deficiency is caused by a genetic fault passed on to a child by their parents. It occurs because some of the colour-sensitive cells in the eyes, called cones, are either missing or do not work properly.Incorrect
Answer: D
Explanation:
● Cystic Fibrosis: This is a single-gene disorder that affects the transport of salt and water in and out of cells, leading to the formation of thick, sticky mucus in the lungs and other organs. This can cause chronic lung infections, difficulty breathing, and malnutrition. This disorder is caused by a mutation in the CFTR gene and it is also an autosomal recessive disorder.
● Hemophilia:It is a rare disorder in which the blood doesn’t clot in the typical way because it doesn’t have enough blood-clotting proteins (clotting factors). Most people who have hemophilia are born with it. It almost always is inherited (passed down) from a parent to a child.
● Down Syndrome: This is a chromosomal disorder that occurs when an individual has an extra copy of chromosome 21. This results in physical and intellectual developmental delays, as well as characteristic facial features such as a small head, upward slanting eyes and a flat facial profile.
● Colour blindness: In the majority of cases, colour vision deficiency is caused by a genetic fault passed on to a child by their parents. It occurs because some of the colour-sensitive cells in the eyes, called cones, are either missing or do not work properly. -
Question 2 of 5
2. Question
2 points2. For an astronaut on the moon, why does the sky appear black rather than blue in the daytime?
Correct
Answer: D
Explanation:
● The sky appears black to an astronaut on the Moon during the day because the Moon has no atmosphere. The blue color of the sky on Earth is caused by the scattering of sunlight by the gases and particles in our atmosphere. This process, known as Rayleigh scattering, causes short-wavelength light, such as blue and violet, to be scattered more than longer-wavelength light, such as red and orange. So, the sky appears blue because our eyes are more sensitive to blue light and it reaches us from all directions.Incorrect
Answer: D
Explanation:
● The sky appears black to an astronaut on the Moon during the day because the Moon has no atmosphere. The blue color of the sky on Earth is caused by the scattering of sunlight by the gases and particles in our atmosphere. This process, known as Rayleigh scattering, causes short-wavelength light, such as blue and violet, to be scattered more than longer-wavelength light, such as red and orange. So, the sky appears blue because our eyes are more sensitive to blue light and it reaches us from all directions. -
Question 3 of 5
3. Question
2 points3. If the pressure on ice is increased more than the normal pressure, it will-
Correct
Answer: B
Explanation:
● For the solids whose volume decreases on melting into liquid form, an increase in pressure will lower down the melting point. While for the solids whose volume increases on melting into liquid, an increase in pressure will increase their melting point. Hence, ice melts at temperature lower than zero degree Celsius.
● Hence, option B is the correct answer.Incorrect
Answer: B
Explanation:
● For the solids whose volume decreases on melting into liquid form, an increase in pressure will lower down the melting point. While for the solids whose volume increases on melting into liquid, an increase in pressure will increase their melting point. Hence, ice melts at temperature lower than zero degree Celsius.
● Hence, option B is the correct answer. -
Question 4 of 5
4. Question
2 points4. Sun appears white at noon and reddish at the time of sunrise or sunset. Which of the following is/are the reasons for it?
1. More scattering of blue and violet colours of light at noon.
2. Less scattering of longer wavelengths of light at sunrise/sunset near horizon.
Select the correct answer using the code given below:Correct
Answer: B
Explanation:
The interplay of light with objects around us gives rise to several spectacular phenomena in nature. The blue colour of the sky, colour of water in deep sea, the reddening of the sun at sunrise and the sunset are some of the wonderful phenomena.
● Statement 1 is not correct: The scattering of light that helps us to understand the bluish colour of the sky and the reddish appearance of the Sun at the sunrise or the sunset. Light from the Sun near the horizon passes through thicker layers of air and larger distance in the earth’s atmosphere before reaching our eyes. However, light from the Sun overhead would travel relatively shorter distance. At noon, the Sun appears white as only a little of the blue and violet colours are scattered.
● Statement 2 is correct: Near the horizon, most of the blue light and shorter wavelengths are scattered away by the particles. Therefore, the light that reaches our eyes is of longer wavelengths. This gives rise to the reddish appearance of the Sun.Incorrect
Answer: B
Explanation:
The interplay of light with objects around us gives rise to several spectacular phenomena in nature. The blue colour of the sky, colour of water in deep sea, the reddening of the sun at sunrise and the sunset are some of the wonderful phenomena.
● Statement 1 is not correct: The scattering of light that helps us to understand the bluish colour of the sky and the reddish appearance of the Sun at the sunrise or the sunset. Light from the Sun near the horizon passes through thicker layers of air and larger distance in the earth’s atmosphere before reaching our eyes. However, light from the Sun overhead would travel relatively shorter distance. At noon, the Sun appears white as only a little of the blue and violet colours are scattered.
● Statement 2 is correct: Near the horizon, most of the blue light and shorter wavelengths are scattered away by the particles. Therefore, the light that reaches our eyes is of longer wavelengths. This gives rise to the reddish appearance of the Sun. -
Question 5 of 5
5. Question
2 points5. With reference to Varroa destructor, consider the following statements:
1. It is a parasitic insect.
2. It attacks and feeds on the honeybee population.
Which of the statements given above is/are incorrect?Correct
Answer: D
Explanation:
● Varroa mite or Varroa destructor is a parasitic bug that attacks and feeds on honeybees. Officials have cautioned that the small pests, which are reddish-brown in colour, have been known to wipe out entire colonies of honeybees. They frequently move from hive to hive and also through beekeeping supplies like detached combs.Hence, both the statements are correct.Incorrect
Answer: D
Explanation:
● Varroa mite or Varroa destructor is a parasitic bug that attacks and feeds on honeybees. Officials have cautioned that the small pests, which are reddish-brown in colour, have been known to wipe out entire colonies of honeybees. They frequently move from hive to hive and also through beekeeping supplies like detached combs.Hence, both the statements are correct.
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