পর্ব ১ | ৭ম শ্রেণি বার্ষিক পরীক্ষার বিজ্ঞান প্রশ্নের উত্তর | Class 7 Annual Exam 2024 Science Answer

Summary

This educational video provides a comprehensive solution discussion for Class 7 science students, focusing on the 2024 sample question paper. It covers 15 multiple-choice questions across various subjects such as biology, physics, chemistry, and environmental science. The video explains the correct answers and concepts behind each question, helping students prepare for their exams. The sample questions are not exact replicas of the final exam but serve as a guide to understand the types of questions that may appear. The video reassures students about the format and objectives of the test, encouraging them to view future parts for further preparation.

Takeaways

• 😀 The video is designed to help 7th-grade students understand and solve the MCQs from their 2024 science sample exam paper.
• 😀 The sample exam questions are intended to provide an idea of the types of questions students will face, not the exact questions in the real exam.
• 😀 Detailed explanations are provided for each MCQ to ensure students understand the concepts behind the answers.
• 😀 The first part of the video covers 15 MCQs with answers and explanations, focusing on topics like biodiversity, cell structures, and chemical reactions.
• 😀 The correct answer for biodiversity measurement involves genetic characteristics (Option B).
• 😀 Nucleus (Option G) is the correct answer when asked about the organelle in the cell diagram.
• 😀 Plastids are responsible for the color in plants, including chloroplasts, chromoplasts, and leucoplasts.
• 😀 Penicillin is made from fungi, and this question emphasizes the importance of understanding sources of medicines.
• 😀 The symbol for iron is Fe, and the video explains various chemical element symbols and their meanings.
• 😀 Solvent is the substance that dissolves other substances, while solute is the substance that is dissolved.
• 😀 The video explains the concept of power with the unit 'Watt,' commonly used in electrical devices.
• 😀 The temperature unit used in most countries is Celsius, although Fahrenheit and Kelvin are also mentioned.
• 😀 Mitochondria are called the 'powerhouses' of the cell because they generate energy for cellular activities.
• 😀 The video highlights the role of sulfur dioxide in greenhouse gas effects and discusses other gases like carbon dioxide.
• 😀 The explanation for soda (Option B) highlights that it is a compound made from multiple elements (Sodium, Carbon, and Oxygen).

Q & A

What is the purpose of providing a sample question paper to students?

The sample question paper is designed to give students an understanding of the type of questions that may appear in their exams. It helps them get an idea of how to approach the answers and prepares them for the actual exam format.

What is the correct answer for the question regarding the measurement of biodiversity?

The correct answer is 'Genetic characteristics.' The question asks what factors are considered when measuring biodiversity, and genetic characteristics play a key role in this process.

Which part of a plant cell is responsible for giving color to the plant?

The correct answer is 'Plastids.' Plastids, specifically chloroplasts and chromoplasts, are responsible for the different colors seen in plants, such as green, red, and yellow.

What is the source of penicillin?

Penicillin is derived from 'Fungi.' It is a well-known antibiotic produced by a certain type of fungus.

What is the symbol for iron (Fe)?

The symbol for iron is 'Fe,' which comes from the Latin word 'Ferrum.' Iron is an essential element in many biological and industrial processes.

What do we call a substance that dissolves another substance?

The correct answer is 'Solvent.' A solvent is the substance that dissolves the solute to form a solution.

Which of the following is an example of sedimentary rock?

The correct answer is 'Coal.' Coal is a sedimentary rock, while graphite, diamond, and marble are examples of metamorphic rocks.

Which unit measures power?

The correct unit for measuring power is 'Watt.' Power is the rate at which work is done or energy is transferred, and the watt is the standard unit of measurement.

Which unit is most commonly used to measure temperature?

The most commonly used unit for temperature is 'Celsius.' Most countries use the Celsius scale, which is based on the freezing and boiling points of water.

Which is the basic particle of an atom that does not have a charge?

The particle that does not have a charge is the 'Neutron.' Protons are positively charged, electrons are negatively charged, but neutrons have no charge.

Which gas contributes most significantly to the greenhouse effect in the atmosphere?

The correct answer is 'Carbon Dioxide.' While other gases like sulfur dioxide also play a role, carbon dioxide is the most significant greenhouse gas contributing to global warming.