Question

Q11. Draw water cycle.

Q12. Give the percentage of water in the following:

a. Tomato b. Human beings c. Milk d. Lettuce

Q13. Write any six uses of water.

Q14. Why do some states in India face drought?

Q15. Why is the level of groundwater decreasing drastically?

Q16. We should not sleep under a tree at night. Why?

Q17. Why do mountaineers going on expedition carry oxygen cylinders with them?

Q18. Why is the ozone layer important for us?

Q19. Show activities that cause air pollution diagrammatically.

Q20. Why do earthworms come out from the soil in the rainy season?​

Answer 1

Answer:

Sulfuric acid is sometimes referred to as the “king of chemicals” because it is produced worldwide in such large quantities. In fact, per capita use of sulfuric acid has been taken as one index of the technical development of a country. Annual production in the United States, which is the world’s leading producer, is well over 39 billion kg (86 billion pounds). It is the cheapest bulk acid.

Answer 2

Q11. It's in the attachment ,please check it.

Q12. (a)Tomatoes : 95% water

(b) Human beings : upto 60%

(c)Milk : 87%

(d)lettuce : 90%

Q13. All the living things (plants and animals) need water to live. We need water for drinking, cooking food, washing utensils, cleaning floor, brushing teeth, bathing, washing clothes, flushing toilets and watering plants.

Q14. In parts of India, failure of the monsoons causes water shortages, resulting in below-average crop yields. This is particularly true of major drought-prone regions such as southern and eastern Maharashtra, northern Karnataka, Andhra Pradesh, Odisha, Gujarat, Telangana, and Rajasthan.

Q15. Pumping water out of the ground faster than it is replenished over the long-term causes similar problems. The volume of groundwater in storage is decreasing in many areas of the United States in response to pumping. Groundwater depletion is primarily caused by sustained groundwater pumping. ... increased pumping costs.

Q16. Human beings need more energy as compared to plants and so, respiration in plants is a slow process. ... That is, the plants leave carbon dioxide at night. On the basis of this it is that in the night if you sleep under the tree, you will not get oxygen, which can cause breathing problem, suffocation etc.

Q17. Mountaineers carry an oxygen cylinder along with them. It is because when they climb mountains, as altitude increases, the amount of oxygen level in the atmospheric air decreases as trees are not found at higher altitudes. As a result, mountaineers suffer from dizziness.

Q18. There is so much oxygen in our atmosphere, that these high-energy ultraviolet rays are completely absorbed in the stratosphere. Ozone is extremely valuable since it absorbs a range of ultraviolet energy. ... Because of this "ozone-oxygen cycle," harmful ultraviolet radiation is continuously converted into heat.

Q19. Human air pollution is caused by things such as factories, power plants, cars, airplanes, chemicals, fumes from spray cans, and methane gas from landfills. One of the ways that humans cause the most air pollution is by burning fossil fuels.

Q20. Soil experts now think earthworms surface during rain storms for migration purposes. "It gives them an opportunity to move greater distances across the soil surface than they could do through soil," said Dr. Lowe. "They cannot do this when it is dry because of their moisture requirements."

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