There are usually several solved examples and practice questions provided in the Science textbook for Class 7. These examples and questions aim to help students understand the concepts and apply them to solve problems. Let's explore this in detail:

1. Solved Examples:
Solved examples are provided after explaining each concept in the textbook. These examples demonstrate the step-by-step process of solving a problem and help students grasp the underlying principles. Some common topics covered in the solved examples include:

- Simple Machines: The textbook may provide examples that illustrate how to calculate the mechanical advantage or efficiency of different types of simple machines, such as levers, pulleys, or inclined planes.

- Chemical Reactions: Solved examples may demonstrate how to balance chemical equations or calculate the mass of reactants and products in a given reaction.

- Electric Circuits: Examples may show how to calculate the resistance, current, or voltage in a circuit using Ohm's law.

- Human Body Systems: Solved examples may explain how to calculate the BMI (Body Mass Index), or solve problems related to the respiratory or circulatory systems.

2. Practice Questions:
In addition to the solved examples, the Science textbook usually includes practice questions at the end of each chapter or section. These questions are designed to test students' understanding and application of the concepts they have learned. Some common types of practice questions include:

- Multiple Choice Questions: These questions provide several options, and students need to select the correct answer.

- Fill in the Blanks: Students are required to fill in the missing words or terms in a given sentence or statement.

- Short Answer Questions: These questions require students to provide brief explanations or definitions.

- Long Answer Questions: These questions are more detailed and may ask students to describe a process, provide examples, or solve a complex problem.

- Diagram-based Questions: Students may be asked to label or draw diagrams related to the topic.

By practicing these questions, students can reinforce their understanding of the concepts and improve their problem-solving skills.

In conclusion, the Science textbook for Class 7 usually contains solved examples and practice questions to enhance students' understanding and application of the subject. These examples and questions cover various topics and help students develop their problem-solving abilities.