Exploring Science Concepts

What are the main functions of the circulatory system?

• Store excess nutrients for later use

• Regulate heart rate and blood pressure only

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

• Facilitate digestion and absorption of food

Name the three types of blood vessels in the human body.

• Arteries, capillaries, and blood cells

• Arteries, veins, and capillaries

• Veins, capillaries, and arteries

• Arteries, veins, and lymphatics

What is the chemical equation for photosynthesis?

• 6CO2 + 6H2O -> C6H12O6 + 6O2

• 6CO2 + 6O2 -> C6H12O6 + 6H2O

• C6H12O6 + 6O2 -> 6CO2 + 6H2O

• 6O2 + 6H2 -> C6H12O6 + 6CO2

Define a catalyst in a chemical reaction.

• A catalyst is a substance that is consumed in a chemical reaction.

• A catalyst slows down a chemical reaction without changing the products.

• A catalyst is a substance that accelerates a chemical reaction without being consumed.

• A catalyst is a type of reactant that alters the equilibrium of a reaction.

What are the layers of the Earth from the surface to the center?

• Crust, Lithosphere, Core, Atmosphere

• Crust, Mantle, Outer Core, Inner Core

• Mantle, Outer Mantle, Inner Mantle, Core

• Lithosphere, Asthenosphere, Mesosphere, Exosphere

Describe the characteristics of the mantle layer of the Earth.

• The mantle is only 100 km deep and does not have convection currents.

• The mantle is primarily composed of water and gases.

• The mantle is a semi-solid layer composed of silicate minerals, extends about 2,900 km deep, and has convection currents.

• The mantle is a liquid layer made of iron and nickel.

What is the purpose of a lever in simple machines?

• To change the direction of a force.

• To reduce friction in machines.

• To store energy for later use.

• The purpose of a lever is to amplify force and make it easier to lift heavy loads.

Give an example of a first-class lever and explain its function.

• A seesaw is an example of a first-class lever.

• A crowbar is an example of a first-class lever.

• A wheelbarrow is an example of a first-class lever.

• A pair of scissors is an example of a first-class lever.

What are the main components of weather?

• Temperature, humidity, and sunlight

• Wind speed and cloud cover

• Atmospheric pressure and ocean currents

• Temperature, humidity, precipitation, wind, and atmospheric pressure.

How does the water cycle contribute to weather patterns?

• The water cycle only affects ocean currents, not weather.

• The water cycle contributes to weather patterns by regulating humidity, temperature, and precipitation, which are essential for various weather phenomena.

• The water cycle has no impact on weather patterns.

• Weather patterns are solely determined by geographical location.