2024 EOYE: Science
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Questions and Answers

Which characteristic of living beings involves the ability to react to changes in the environment?

  • Nutrition
  • Sensitivity (correct)
  • Excretion
  • Growth

    • What is the primary function of the chloroplast in a plant cell?

  • Provide energy through photosynthesis (correct)
  • Facilitate cell division
  • Store water and waste
  • Control cell movement

    • Which of the following organelles is unique to plant cells and provides structural support?

  • Cell wall (correct)
  • Vacuole
  • Nucleus
  • Mitochondria

    • How do animal cells differ from plant cells in terms of vacuoles?

    <p>Plant cells have larger vacuoles</p> Signup and view all the answers

    What process do living organisms use to obtain energy for growth and movement?

    <p>Respiration</p> Signup and view all the answers

    What is the main role of the mitochondria in a cell?

    <p>Provide energy through respiration</p> Signup and view all the answers

    Which of the following statements is true regarding the shape of plant and animal cells?

    <p>Plant cells are regular in shape and larger</p> Signup and view all the answers

    Why must living organisms carry out excretion?

    <p>To remove potentially poisonous waste</p> Signup and view all the answers

    What is the primary reason plant cells have a cell wall?

    <p>To provide structure and strength</p> Signup and view all the answers

    Why do animal cells lack a large vacuole compared to plant cells?

    <p>They have different storage organs</p> Signup and view all the answers

    How do you calculate the total magnification of a microscope?

    <p>By multiplying the magnification of the eyepiece and objective lens</p> Signup and view all the answers

    What role do chemical stains play when preparing microscope slides?

    <p>They darken transparent cell structures for visibility</p> Signup and view all the answers

    What is a potential issue when laying the coverslip on the specimen?

    <p>It might trap air bubbles</p> Signup and view all the answers

    Why is it important to handle the coverslip by the sides only?

    <p>To prevent contamination with oils from fingers</p> Signup and view all the answers

    What might occur if the highest objective lens is used before adjusting to lower magnifications?

    <p>The specimen will be more difficult to locate</p> Signup and view all the answers

    What is the function of the stage clip on a microscope?

    <p>To hold the slide in place</p> Signup and view all the answers

    What type of energy is stored in the bonds between atoms in substances like petrol and food?

    <p>Chemical Potential Energy</p> Signup and view all the answers

    Which of the following is an example of kinetic energy?

    <p>A moving car</p> Signup and view all the answers

    What is the process called when energy changes from one form to another?

    <p>Energy Transformation</p> Signup and view all the answers

    Which of the following energy types is caused by the movement of atoms?

    <p>Heat Energy</p> Signup and view all the answers

    What does the Law of Conservation of Energy state?

    <p>Energy can be transformed but not created or destroyed.</p> Signup and view all the answers

    How is energy efficiency calculated?

    <p>Useful energy output divided by total energy input times 100.</p> Signup and view all the answers

    What type of energy is involved when a ball rolls down a hill?

    <p>Gravitational Potential Energy transforming into Kinetic Energy</p> Signup and view all the answers

    What is sound energy produced by?

    <p>Vibrating objects</p> Signup and view all the answers

    What process describes the movement of air freshener particles spreading out in a room?

    <p>Diffusion</p> Signup and view all the answers

    Why was it easy to compress air in the syringe?

    <p>Air particles have a spread out structure.</p> Signup and view all the answers

    What happens to the gaps between particles in the metal ball when it is heated?

    <p>The gaps expand.</p> Signup and view all the answers

    What type of energy is associated with the motion of particles?

    <p>Active Energy</p> Signup and view all the answers

    Which statement is true about compressing water in a syringe?

    <p>It sprays out due to the high density.</p> Signup and view all the answers

    What happens to the size of a helium balloon over time due to particle size?

    <p>It gets smaller as more helium particles escape due to their small size.</p> Signup and view all the answers

    What indicates that wood particles have little space between them?

    <p>Wood cannot be compressed effectively.</p> Signup and view all the answers

    What occurs when a heated metal ball cools down?

    <p>The gaps between particles contract.</p> Signup and view all the answers

    What did the addition of 50 ml of meths to 50 ml of water illustrate about the arrangement of particles?

    <p>Some meth particles fit into the gaps between the water particles.</p> Signup and view all the answers

    Which statement correctly describes potential energy?

    <p>Stored energy based on an object's position.</p> Signup and view all the answers

    How do particles in hot water behave compared to those in cold water regarding diffusion?

    <p>Particles in hot water diffuse faster because they gain energy.</p> Signup and view all the answers

    What conclusion can be drawn about the mass of gas particles when they escape from a balloon?

    <p>The mass decreases as more smaller particles leave the balloon.</p> Signup and view all the answers

    What impact does temperature have on the speed of particles in a solution?

    <p>Higher temperatures increase the speed of particles by providing more energy.</p> Signup and view all the answers

    How does the size of particles affect the ability to escape from a container?

    <p>Smaller particles escape more readily due to their size.</p> Signup and view all the answers

    What does the addition of potassium permanganate crystals to hot water reveal about particle behavior?

    <p>Particles in hot water dissolve and diffuse quickly due to increased energy.</p> Signup and view all the answers

    What misconception might one have about the behavior of air fresheners when sprayed in the air?

    <p>Air fresheners spread quickly because the particles gain energy from the surroundings.</p> Signup and view all the answers

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