List any four disadvantages of using fossil fuels for the production of energy.
The four disadvantages of using fossil fuels for the production of energy are:
i. It releses high concentration of posinous gases like oxides of sulphur and nitrogen which may cause air pollution and acid rain.
ii. It results in the increase of concentration of Carbon dioxide in the enviroment and hence reults in global warming.
iii. When burnt in less oxygen large amount of toxic gas Carbon monoxide is released which may have adverse effect on the organisms.
iv. They are non-renewable resources of energy, their overuse may lead to depletion of these resources.
List three problems which arise due to the construction of big dams. Suggest a solution for these problems.
What is sustainable management? Why is reuse considered better in comparison to recycle ?
State the meaning of inherited traits and acquired traits. Which of the two is not passed on to the next generation? Explain with the help of an example.
Energy flow in a food chain is unidirectional. Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
