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Cement and concrete
Secure a small bag of Portland cement. Have the pupils mix it with water and put it in tin can covers, paper cups, or small pasteboard boxes unless it hardens. Study its appearance and its properties. Break a piece of cement and study it. Mix the dry cement with about twice as much sand or gravel. This will form concrete. After adding water and mixing thoroughly place it in moulds. Permit these to arden various days. Again study the appearance and the characteristics of these samples.
Explain the Hormones from the Islets of Langerhans The cells which make up the Islets of Langerhans are found in clusters, distributed throughout the substance of the pancreas.
What is the difference among a semi-precious and a precious stone? The difference among precious and semi-precious comes down purely to human definitions that have been compuls
Internal Bleeding : There is little that you can do for most internal bleeding other than treating for shock and calling for a doctor immediately. If the patient's condition becom
What is Soil Aggregation and explain its beneficial role Some organisms may play a beneficial role indirectly by creating better soil physical conditions e.g., by improving soi
Define the Blood Groups We start our discussion by answering the question - do all of us have the same blood group? No, each individual has a different blood group. The differ
The Water Cycle Heat some water unless it is near the boiling point. Place it in a drinking glass and rotate the glass so as to moisten the sides right to the top. Place some v
Explain Mucous membranes - External Defence Mechanism Mucous membranes: The digestive, urinary, genital and respiratory tracts open out at one or both ends. They do not have a
Why are peaty and marshy soils highly acidic? The acidity is due to decomposition of organic matter under anaerobic conditions and formation of sulphuric acid.
Sate about the Soil water potential Electrical energy, potential energy and kinetic energy together are referred to as free energy or the energy status of water. The difference
Illustrating an eclipse of the sun Hold a small coin a few inches from one eye and close the other eye while looking at the lighted electric bulb on the ceiling of a room. The
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