9th Eng Science Part1

From early days, man has been curious about the sun as well as the moon and stars seen in the night sky. Using his boundless imagination, he tried to understand […]

Tissue  In the case of amoeba-like unicellular organisms, all functions are performed by organelles of that single cell. However, most of the organisms are multicellular. How are the various processes […]

Earlier, we have seen that there is great variation within every species in nature. In this chapter, we shall study the factors that give rise to these variations. Inheritance The […]

We have studied how digested food or oxygen inhaled by lungs is transported to every cell of the human body. The farmer also tries to transport the water from wells […]

We use various substances in day to day life. We have previously learnt in some detail about a few of them, their uses and constituents and the method of their […]

Carbon The element carbon is available abundantly in the nature and occurs in free as well as in the combined state. In this chapter, let us study the properties of […]

Sound is a form of energy which creates the sensation of hearing in our ears. This energy is in the form of waves. A medium is necessary for the propagation […]

Light is an agent which gives us information about what is happening in our surroundings. We can enjoy various wonders of nature like the sunrise, sunset and rainbow only because […]

The term Information Communication Technology (ICT) includes communication devices and the use of those devices as well as the services provided with their help. The store of information generated due […]

Weather and climate Atmospheric conditions at a specific time at a particular place are referred to as weather. Atmospheric conditions depend upon a variety of factors. (Figure 9.1) We frequently […]