1
Praxis PT#2 Middle School Science Questions and Answers Latest Version Already Passed
What is the primary source of energy for nearly all ecosystems on Earth?✔✔The Sun
Why does a metal spoon feel colder than a wooden spoon at the same room temperature?✔✔Metal conducts heat away from your hand faster than wood
What causes the different phases of the Moon?✔✔The Moon's position relative to the Earth and Sun
Why does warm air rise above cooler air?✔✔Warm air is less dense than cool air
What is the role of producers in a food web?✔✔They convert solar energy into chemical energy through photosynthesis
- / 4
2
What process allows plants to release water vapor into the air?✔✔Transpiration
How are metamorphic rocks formed?✔✔By heat and pressure acting on existing rocks
What part of the atom determines the chemical properties of an element?✔✔The number of electrons
Why do we see lightning before we hear thunder?✔✔Light travels faster than sound
What is the function of the respiratory system in humans?✔✔To exchange oxygen and carbon dioxide with the environment
Why does a compass needle point north?✔✔It aligns with Earth’s magnetic field
- / 4
3
What causes tides on Earth?✔✔The gravitational pull of the Moon and Sun
What is one main purpose of mitosis in multicellular organisms?✔✔To allow growth and repair by producing identical cells
Why do ice cubes float in water?✔✔Ice is less dense than liquid water
What is the main reason Earth experiences seasons?✔✔The tilt of Earth’s axis as it orbits the Sun
What happens to the particles of a substance as it changes from a solid to a liquid?✔✔The particles move faster and spread farther apart
What is a common sign that a chemical reaction has taken place?✔✔A new substance is formed
- / 4
4
Why do astronauts appear weightless in orbit?✔✔They are in continuous free fall around Earth
What part of a plant absorbs water and nutrients from the soil?✔✔The roots
Why is biodiversity important in ecosystems?✔✔It increases stability and resilience
How do vaccines help prevent diseases?✔✔They stimulate the immune system to recognize and fight pathogens
What is one effect of deforestation on the carbon cycle?✔✔It reduces carbon absorption by trees
Why does salt dissolve in water?✔✔Water molecules surround and separate the ions
- / 4