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Praxis Science 7814 Questions and Answers Latest Version Graded A+
What is the main function of roots in a plant?
- To produce flowers
- To perform photosynthesis
- To make seeds
✔✔ B. To absorb water and nutrients
What is the state of matter with a definite shape and volume?
- Gas
- Liquid
- Plasma
✔✔ C. Solid
What gas do humans need to breathe in order to survive?
- Carbon dioxide
- Nitrogen
✔✔ C. Oxygen 1 / 3
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- Hydrogen
Which part of the human body controls voluntary movement?
- Heart
- Stomach
- Lungs
✔✔ C. Brain
What causes seasons on Earth?
- Earth’s distance from the sun
- Earth’s tilt on its axis
- Changes in sun’s temperature
✔✔ C. Earth’s tilt and revolution around the sun
Which simple machine is a seesaw an example of?
- Wheel and axle
- Pulley
✔✔ C. Lever 2 / 3
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- Inclined plane
What is the process by which water changes from liquid to gas?
- Condensation
- Freezing
- Melting
✔✔ B. Evaporation
Which organelle is known as the “powerhouse” of the cell?
- Nucleus
- Ribosome
- Chloroplast
✔✔ C. Mitochondria
What is the force that pulls objects toward Earth?
- Magnetism
- Friction
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✔✔ B. Gravity