Class 8 : Science

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Across
  1. 3. The process in which a solid changes into a liquid when heated.
  2. 7. A recurring sequence of events, often in nature.
  3. 8. A substance that releases hydrogen ions when dissolved in water.
  4. 10. The phenomenon by which materials exert attractive or repulsive forces on each other.
  5. 12. The smallest type of blood vessel that connects arteries and veins.
  6. 17. A layer in the atmosphere that protects Earth from harmful ultraviolet radiation.
  7. 18. A state of matter that has neither a definite shape nor a definite volume.
  8. 20. The basic building blocks of matter.
  9. 23. The fusion of male and female gametes to form a zygote.
  10. 27. A type of bond formed when atoms share electrons.
  11. 29. Clues:
  12. 31. A process in which one or more substances are changed into others.
  13. 32. A form of energy that travels through air as a vibration of particles.
  14. 33. A species that is at risk of becoming extinct.
  15. 34. A measure of how acidic a solution is, typically measured on the pH scale.
  16. 37. The process by which water moves through the soil and into the roots of plants.
  17. 38. The flow of electric charge in conductors.
  18. 39. The branch of biology that deals with the study of ecosystems and organisms' interactions with their environment.
  19. 40. Related to the moon.
  20. 43. A classification based on biological differences and roles in reproduction.
  21. 44. A microscopic infectious agent that can only reproduce within the living cells of a host organism.
  22. 47. The process by which a gas changes into a liquid.
  23. 50. A substance that dissolves a solute to form a solution.
  24. 51. The process by which plants make their own food using sunlight.
  25. 53. The units of heredity that carry information for traits in organisms.
  26. 54. The element in the atmosphere that makes up about 78% of it.
  27. 58. Compounds that contain carbon, typically from living organisms.
  28. 59. The ability to maintain ecological balance and avoid depletion of resources.
  29. 61. The process by which organisms convert food into energy with the help of oxygen.
Down
  1. 1. An object that produces a magnetic field and attracts certain materials like iron.
  2. 2. The fine powder released by flowers that contains the male gametes in plants.
  3. 4. The process by which traits are passed from parents to offspring.
  4. 5. The process by which liquid turns into gas.
  5. 6. Subatomic particles that have no charge and are found in the nucleus of an atom.
  6. 9. The process by which insects and amphibians change their body form during their life cycle.
  7. 11. A compound of nitrogen and hydrogen commonly used in fertilizers.
  8. 13. The process by which plants make their own food using sunlight.
  9. 14. The introduction of harmful substances into the environment.
  10. 15. A state of matter with a definite shape and volume.
  11. 16. A substance used to stimulate the production of antibodies to protect against diseases.
  12. 19. The system that is responsible for the transport of blood, nutrients, and gases in the body.
  13. 21. The scientific study of animals and their biology.
  14. 22. An instrument used to measure temperature.
  15. 24. A pH of 7, indicating neither acidity nor alkalinity.
  16. 25. A phenomenon by which materials exert attractive or repulsive forces on each other.
  17. 26. The force that attracts objects towards the center of the Earth.
  18. 28. A substance that releases hydrogen ions when dissolved in water.
  19. 30. The transfer of heat through a material without the movement of the material itself.
  20. 35. A material that allows the flow of electric current.
  21. 36. The fluid in the circulatory system that carries oxygen and nutrients to the body.
  22. 41. A pure substance that cannot be broken down into simpler substances by chemical means.
  23. 42. The green pigment in plants that is involved in photosynthesis.
  24. 45. A material that does not allow the flow of electricity.
  25. 46. The process by which two atoms combine to form a heavier atom, releasing energy.
  26. 48. The degree of hotness or coldness of an object, typically measured with a thermometer.
  27. 49. The branch of science that deals with the composition, structure, and properties of matter.
  28. 52. The reproductive body of a plant that contains an embryo.
  29. 55. The branch of science that deals with celestial objects, space, and the universe.
  30. 56. Refers to a system based on two digits, often 0 and 1, in computing.
  31. 57. The movement of molecules from an area of higher concentration to an area of lower concentration.
  32. 60. The preserved remains or traces of organisms from past geological ages.