• Test Papers 2009-2010
• • CBSE Test Papers for class 10 Science and Technology based on topic Our Environment for the year 2009-2010. All important points related to this topic are covered here. What happens when we add our waste to the environment. Ecosystem: What are its components? Food chain and webs. How do our activities affect the environment? Ozone layer and how it is getting depleted, managing the garbage we produce.

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