Int Science Olympiad_Selection Part 1_SMP Plus Pst Amanah

What are the main functions of the circulatory system?

• Facilitate digestion and absorption of food

• The main functions of the circulatory system are to transport blood, deliver oxygen and nutrients, remove waste products, and regulate body temperature.

• Store excess nutrients for later use

• Regulate heart rate and blood pressure only

Describe the process of photosynthesis and its importance in ecosystems.

• Photosynthesis is crucial for ecosystems as it produces oxygen and organic compounds, forming the base of the food chain and supporting life on Earth.

• Photosynthesis is a process that consumes carbon dioxide and releases carbon monoxide.

• Photosynthesis is irrelevant to the food chain and has no impact on ecosystems.

• Photosynthesis occurs only in animals to produce energy.

What is the law of conservation of mass in chemical reactions?

• Mass can be created in chemical reactions.

• Mass is only conserved in physical changes.

• The total mass remains constant in chemical reactions.

• The total mass increases during a reaction.

Explain the role of decomposers in an ecosystem.

• Decomposers are only found in aquatic ecosystems.

• Decomposers primarily consume sunlight.

• Decomposers produce energy for plants.

• Decomposers recycle nutrients, enrich soil, and maintain ecosystem balance.

What are the four main types of human body tissues?

• Connective, muscular, dermal, and epithelial tissue.

• Nervous, epithelial, adipose, and lymphatic tissue.

• Epithelial, connective, muscle, and nervous tissue.

• Epithelial, muscular, skeletal, and connective tissue.

How do enzymes affect the rate of chemical reactions?

• Enzymes only work in acidic environments and do not affect reactions in neutral or basic conditions.

• Enzymes have no effect on the rate of chemical reactions.

• Enzymes increase the rate of chemical reactions by lowering the activation energy.

• Enzymes decrease the rate of chemical reactions by increasing the activation energy.

Define an ecosystem and give an example.

• A forest ecosystem.

• A desert ecosystem.

• An urban ecosystem.

• A marine ecosystem.

What is the difference between potential and kinetic energy?

• Kinetic energy is stored energy based on position.

• Potential energy is the energy of sound waves.

• Potential energy is stored energy based on position; kinetic energy is energy of motion.

• Potential energy is always greater than kinetic energy.

Describe the structure and function of the respiratory system.

• The respiratory system's main function is to produce hormones for metabolism.

• The respiratory system is structured to filter, warm, and humidify air, and its primary function is to facilitate gas exchange (oxygen and carbon dioxide) in the lungs.

• The respiratory system is responsible for nutrient absorption in the intestines.

• The respiratory system primarily circulates blood throughout the body.

What factors can affect the rate of a chemical reaction?

• Color of reactants

• Humidity levels

• Temperature, concentration, surface area, catalysts, and nature of reactants.

• Time of day