CBSE ADDA

Question:  Why should we need to conserve biodiversity?                   or, What is biodiversity ?What role does it play in an ecosystem ? Answer:  The variety of plant and animal life in the world or in a particular habitat is called What is biodiversity. Plants and animals depend on each other for their survival. If we disturb  any of them will affect the life of each other. Hence, we need to conserve biodiversity to maintain the balance of nature. Question: Differentiate between the Wildlife sanctuary and biosphere reserve. Answer:  Wildlife sanctuary it is an area within which animals are protected from possible dangers such as hunting. Their habitat is also conserved in this area. It provides protection and suitable living conditions to wild animals. Pachmarhi sanctuary is a wildlife sanctuary. Biosphere reserve It is a large protected area constructed for the conservation of biodiversity. It helps in the conservation of various life forms such as plant

IX Class Question solution for Physics Chapter Sound 1. How sound is produced? Answer:   Sound is produced by the vibration of vibrating object. 2. What do you understand by a ‘wave’? Answer:  A periodic disturbance created in material medium that transfer sound and light energy is called wave. 3. Write three differences between sound and light waves. Answer:   sound wave is Mechanical wave that require material medium for propagation where as light waves are electromagnetic wave that can travel in vacuum. 4. What do you understand by “sound energy cannot be produced”? Answer: Sound energy cannot be produced on its own. Some mechanical energy is required to make an object vibrate. It is the mechanical energy of the vibrating object which travels through a medium and ultimately reaches the ear. 5. What is the name of the wave that can travel through vacuum? Answer:   Electromagnetic wave 6. Explain by some experiment that sound waves require medium for their

Microorganisms Definition The organisms which cannot be observed with the naked eye and can be seen only through a microscope are called microorganisms or microbes. Food and water become unsafe for consumption due to the presence of harmful organisms, commonly referred to as germs . These germs are so small that they are invisible to the naked eye, but can often cause dangerous diseases. Since these organisms can be seen only through a microscope, they are called microorganisms or microbes. When the body is attacked by germs or pathogens, medicines called antibiotics are given. Antibiotics act against the bacteria within the body, without harming the person. Microorganisms Microorganisms are present in the air, water, food and even inside our bodies. While a majority of the microbes are harmless, some of them have the capability of causing dangerous diseases. Microorganisms Bacteria Algae Fungi Protozoa Vir