True or False . Read each statement carefully. On the line write true if the sentence is correct. Write false if it is incorrect. 1. Organisms in an ecosystem interact with other organisms for their survival. ___________ 2. Plants produce their own food in the form of glucose during photosynthesis. ___________ 3. Force is a push or a pull. ___________ 4. Force can change the direction of moving objects . ___________ 5. Safety measures and proper handling of materials must always be observed in school and at home. ___________ 6. A magnet has two ends called the north pole and the south pole. ___________ 7. Light trav els in a straight line. ___________ 8. The sun is the main source of both heat and light. ___________ 9. Sound energy is produced by vibrating object s and travels through a medium. ___________ 10. Heat travels from one object to another through conduction, convection, or radiation . ___________