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Subham Kumar

Asked: December 30, 2023In: Class 10 Science

Ozone formation takes place in the stratosphere of our atmosphere. (a) Explain how the energy of the Sun helps in the formation of ozone. (b) Why is ozone formation at ground level considered a pollutant? (c) State any two health consequences of ozone layer depletion on human health.

The ozone layer, located in the Earth’s stratosphere, shields life from harmful ultraviolet (UV) radiation. Human-made substances, such as chlorofluorocarbons (CFCs), contribute to ozone depletion, threatening environmental and health impacts.

Subham Kumar

Asked: December 30, 2023In: Class 10 Science

Two major forces help in the transport of water in a plant. Force A is the driving force in the movement of water during the day, whereas force B helps the movement of water in a plant during the night or during the day when humidity is very high. (a) Identify force A and force B. (b) Describe how each of these forces helps in the movement of water in a plant.

Water in plants moves through xylem vessels via capillary action and transpiration. Root absorption, cohesion, and adhesion contribute to the upward flow, ensuring nutrient transport and maintaining plant turgidity.

Subham Kumar

Asked: December 30, 2023In: Class 10 Science

The Thermit process is used for repairing cracks in railway tracks on site. (a) Write the equation for the reaction taking place in the process, mentioning the physical states of the reactants and products. (b) What information in the chemical equation indicates that the reaction is exothermic?

Thermit process is a metallurgical reaction where a mixture of aluminum powder and a metal oxide, typically iron oxide, undergoes an exothermic reaction, producing molten metal and heat.

Subham Kumar

Asked: December 30, 2023In: Class 10 Science

White light is passed through a prism to yield a spectrum. (a) The ray of which colour will show the maximum angle of deviation and which one will show the least angle of deviation? (b) A blue-coloured ray is passed through a glass prism. What will be the colour of the emergent ray? Justify your answer.

When light passes through a prism, it undergoes refraction, separating into its component colors due to varying speeds in the different wavelengths. This dispersion reveals the spectrum, showcasing distinct hues.

Subham Kumar

Asked: December 30, 2023In: Class 10 Science

Oxygen, mostly, is carried by a pigment in our blood whereas carbon dioxide is transported in dissolved form in our blood. Give TWO reasons that make the above statement correct.

Oxygen in human blood is vital for cellular respiration, generating energy for body functions. It sustains life, supporting metabolic processes and ensuring organs and tissues receive the necessary oxygen for optimal functioning.

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Ozone formation takes place in the stratosphere of our atmosphere. (a) Explain how the energy of the Sun helps in the formation of ozone. (b) Why is ozone formation at ground level considered a pollutant? (c) State any two health consequences of ozone layer depletion on human health.

The Thermit process is used for repairing cracks in railway tracks on site. (a) Write the equation for the reaction taking place in the process, mentioning the physical states of the reactants and products. (b) What information in the chemical equation indicates that the reaction is exothermic?

Oxygen, mostly, is carried by a pigment in our blood whereas carbon dioxide is transported in dissolved form in our blood. Give TWO reasons that make the above statement correct.

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