Latihan Soal PTS/STS IPA Kelas 8 Semester 2 Kurikulum Merdeka Tahun 2025

Summary

This educational video provides a series of practice questions for middle school students studying the science subject (IPA) in the second semester. It covers a range of topics, including pressure, Archimedes' principle, plant biology, respiratory system, and excretion. The video includes multiple-choice questions and answers, along with explanations to guide students in understanding key scientific concepts. Aimed at students preparing for their mid-term assessments, the video encourages engagement through interactive questions and clear, concise explanations to help learners master important material in the curriculum.

Takeaways

• 😀 Upaya to get high pressure: increase force and reduce the surface area.
• 😀 Factors affecting pressure include surface area and force applied.
• 😀 A metal drum floats in water because its total density is less than the water's density.
• 😀 The principle of Archimedes is not used in car jacks.
• 😀 Capillary action in plants is driven by osmosis in root cells.
• 😀 Pascal's Law is applied when measuring blood pressure using a sphygmomanometer.
• 😀 The primary function of the respiratory system is gas exchange (oxygen and carbon dioxide).
• 😀 The epiglottis prevents food and drink from entering the larynx and trachea.
• 😀 The pleura protects the lungs by reducing friction during expansion and contraction.
• 😀 A key action in inspiration is the contraction of external intercostal muscles and diaphragm.

Q & A

What is the main objective of the PTS or UTS exercise mentioned in the script?

The main objective of the PTS or UTS exercise is to provide practice questions for the mid-semester evaluation in the subject of Science (IPA) for class 8 students in the second semester of the 2025 Merdeka Curriculum.

What action can increase pressure according to the script?

Increasing the applied force and reducing the surface area can increase pressure.

Which factors influence the magnitude of pressure?

The factors that influence pressure are the surface area and the applied force.

Why does a steel drum float in water, according to the script?

A steel drum can float in water because the overall density of the drum is less than the density of water.

Which technology does not use Archimedes' principle, as per the script?

A car jack does not use Archimedes' principle.

What causes water to rise from the roots to the leaves in plants?

The rise of water in plants from roots to leaves is caused by capillarity, which is enhanced by osmotic processes occurring in the root cells.

Which law is applied when measuring blood pressure with a sphygmomanometer?

Pascal's law is applied when measuring blood pressure with a sphygmomanometer.

What is the function of the epiglottis?

The epiglottis functions to prevent food particles or liquids from entering the larynx and trachea during swallowing.

Which organ in the human respiratory system is responsible for gas exchange?

The alveolus in the lungs is responsible for the exchange of gases, such as oxygen and carbon dioxide.

What is the main function of the pleura in the respiratory system?

The pleura protects the lungs by reducing friction during expansion and contraction.

Which factor does not affect respiratory rate, as per the script?

The environmental temperature does not affect the respiratory rate.

What is the residual volume of air in the lungs?

The residual volume of air in the lungs is 1000 mL.

What condition is indicated by the presence of bacteria in a patient's lungs along with fluid accumulation?

The condition indicated is pneumonia, as the patient has bacteria (Streptococcus) in the fluid-filled lungs.

What is a key way to maintain respiratory health, according to the script?

One key way to maintain respiratory health is to avoid smoking.

Which organ is not involved in excretion according to the script?

The large intestine (usus besar) is not involved in excretion.