HUMAN EYE AND COLOURFUL WORLD HUMAN EYE: Eye is the most important organ of our body which is an optical device that serves as our organ of sight. It acts like a camera, enable us to capture the colourful picture of the surroundings. An inverted, real image on light sensitive is formed on the Retina. The…
Read MoreLight: Light is a form of energy, which induces sensation of vision to our eyes and makes us able to see various things present in our surroundings. The light ray may be objects selt light or reflected light. Luminous objects are objects which emit their own light. Eg: sun, bulb, tube – light etc. Non…
Read MoreAcids is defined as the one which produces hydrogen ions in water. For Example, Sulphuric Acid, Hydrochloric Acid etc. They give sour taste. Acids turn blue litmus to red. This is used as confirmation test for the presence of acid. When acids react with metals, gases are evolved. The acids present in plants and animals are…
Read MoreARTICLES INTRODUCTION An article is a word that modifies or describes the noun. It is used before the noun to show whether it refers to something specific or not. So, articles can also be described as demonstrative adjectives. WHAT ARE ARTICLES? An article is a word or a letter which is used before noun…
Read MoreCHAPTER 7: CONTROL AND COORDINATION Living organisms respond to various stimuli like heat, light, cold, touch, pressure etc. Example: Withdrawal of hand on touching a hot object. Control and Coordination in Animals It is brought about in all animals with the help of two main systems (a) Nervous System (b) Endocrine System Nervous System: Consists…
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