Category: Science
Transpiration and Guttation: The following are the points of difference between Transpiration and Guttation- Transpiration Guttation Transpiration occurs mostly during the day when the temperature is comparatively higher. Guttation occurs during the cold hours of the night and early morning. Transpiration occurs through stomata, lenticels and cuticles. Guttation occurs through hydathodes. It is a loss of …
Stomata and Hydathodes: The following are the points of difference between Stomata and Hydathodes- Stomata Hydathodes Found in the epidermis of leaves, young stems, perianth and fruits. Present on the tips and margins of the leaves at the vein ends. These are surrounded by pairs of chlorophyllous guard cells. They are surrounded by a ring of …
Energy from Producers flows through various Trophic Levels: The energy flows from the producer to the successive orders of consumers in only one way and it cannot be transferred in the reverse direction. Second, the amount of energy flow decreases with successive trophic levels. Producers capture only a small fraction of solar energy (1-5% of total …
Experiments of Benjamin Thompson: One of the first experiments which rejected the caloric theory of the nature of heat was performed by Benjamin Thompson in the year 1798. Benjamin was an English engineer who was in charge of the boring of a cannon for the army. The cannon was being made by boring a hole in …
What is Ozone Layer? In the atmosphere, Ozone is largely found in the stratosphere. Ozone absorbs most of the UV radiations of the sun and thus acts as a shield, protecting the living organisms on Earth from health hazards. That’s why the ozone layer is also called the Ozone Shield. Key Point: September 16 is World …
What are Polaroids? A polaroid is a material that polarizes light. Tourmaline is natural polarising material. Nowadays polaroids are artificially made. Quinine Idosulfate is an artificial polaroid. Uses of Polaroids: Some of the uses of Polaroids are as under- (1) One of the uses of the polaroid is in avoiding the glare of light. Sunlight reflected …
Doppler Effect and its Application: What is Doppler Effect? The frequency of a sound wave is equal to the frequency of the source which is producing the sound wave. It has been observed that the frequency of the sound waves produced by the same source can be changed by the motion of the source, or observer, …
What is a Moving Coil Galvanometer? It is an instrument used for the detection and measurement of small electric currents. Principle of Moving Coil Galvanometer: When a current-carrying conductor is placed in a magnetic field, it experiences a torque which is given by- 𝜏 = nIBA Cosθ Construction of Moving Coil Galvanometer: A rectangular or circular …
What is Transformer? A transformer is a device that changes a low ac voltage into a high voltage or vice-versa. The transformer that increases the voltage is known as a step-up transformer and that decreases the voltage is known as a step-down transformer. Principle- It works on the principle of electromagnetic induction. When the current in …
What is Spectrum? The ordered arrangement of radiations according to their wavelengths or frequencies is called Spectrum. Origin of Spectrum: Every substance consists of atoms. Each atom has a positively charged central core called a nucleus. The nucleus contains protons and neutrons. The electrons revolve around the nucleus in various orbits as shown. The number of …
