11. What shall we do if we are not sure on the safety of our drinking water? A. Heat it under the sun. B. Put it inside the refrigerator. C. Boil it for at least 15 minutes. D. Drink directly. 12. Carmela forgot to water her plants for a week. What would likely to happen to the plants? A. bigger roots C. bigger stems B. grow robustly D. have yellowish leaves 13.What particles of soil that are packed together tightly and it is sticky when wet and has the finest texture? A. clay B. loam C. sand D. all of the above 14. Which of the following terms is used to describe a layer of soil particle? A. soil horizon B. silt layer C. soil aggregate D. granulation 15. In which layer of the soil do we usually find loam? A. Topsoil C. Bedrock B. Parent soil D. Ground soil
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Answer:
11. C. Boil it for at least 15 minutes.
12. D. Have yellowish leaves.
13. A. Clay
14. A. Soil Horizon
15. A Topsoil
Explanation:
11. If you don't have safe bottled water, you should boil your water to make it safe to drink. Boiling is the surest method to kill disease-causing germs, including viruses, bacteria, and parasites.
12. When a plant doesn't get enough water, the tips and edges of leaves dry out and turn brown or yellow. Ultimately, entire leaves will turn brown and die.
13. Clay particles bind other soil particles together. Air can't get between the particles because they are very small and tightly packed together so they are poorly aerated. Water can't drain away easily. They get very sticky when wet, making cultivation difficult.
14. A soil horizon is a layer parallel to the soil surface whose physical, chemical and biological characteristics differ from the layers above and beneath. Horizons are defined in many cases by obvious physical features, mainly colour and texture.
15. The layer of the soil we usually find loam is the topsoil. Loam is a subcategory of topsoil. Therefore loam is topsoil, but topsoil is not always loam. It is a mixture of sand, silt, clay, and organic matter