Here are the answers to the questions: 1) When the position of any object changes, then we can say that displacement has taken place. 2) For measuring work, both the force and the displacement must be considered. 3) The various forms of energy are mechanical energy, heat energy, light energy, sound energy, chemical energy, and electrical energy. 4) Plants prepare food by utilizing solar energy. The food produced is in the form of chemical energy. This food is consumed by animals, who develop muscular energy. The digestion of food also produces heat energy in the body. This natural chain of transformation of energy can be shown as follows: $$ \text{Solar energy} \rightarrow \text{Chemical energy} \rightarrow \begin{cases} \text{Muscular energy} \\ \text{Heat energy} \end{cases} $$ 5) Saving energy is crucial because fuels are depleting rapidly, and large-scale energy production leads to significant carbon dioxide emissions, contributing to global warming and pollution. Conserving energy helps protect our environment. 6) Green energy refers to energy resources that do not emit smoke and carbon products. The energy produced from these resources is considered green energy. 7) Non-conventional energy resources are inexhaustible and continuously available energy resources that were not traditionally used. Examples include solar energy, wind energy, tidal energy, hydel power, atomic energy, and energy obtained from oceanic waves. That's 2 down. 3 left today — send the next one.