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.
Inherited traits are those traits which can be passed from one generation to the next generation. These involve changes in the DNA.
Acquired traits - An acquired trait is a physical characteristic of an organism that is not passed down to offspring genetically. It is not coded in the organism's DNA and is a product of the environment's influence on the organism. These traits are acquired during the lifetime.
The acquired traits are not passed to the next generation. For example, if a person has increased the muscle strength and size by exercising regularly, then he/she cannot pass the same to their offspring.
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.
What is sustainable management? Why is reuse considered better in comparison to recycle ?
List three problems which arise due to the construction of big dams. Suggest a solution for these problems.
List any four disadvantages of using fossil fuels for the production of energy.
