40 Hard Trivia Questions for Adults

1. Regular droplets appear at a leaf’s edges because the plant is pushing out liquid. What is this process called?

2. What is the term for dry seed material taking up water and swelling at the start of germination?

3. A root curves toward a source of moisture. Which directional growth response does this illustrate?

4. Some plants fold their leaves each night and reopen them by day. What is this “sleep movement” called?

5. What term describes chemicals released by one plant influencing the growth of another?

6. What are the upright, air-exchanging roots that rise above mud around some mangroves called?

7. Which oil-rich attachment on some seeds provides a food reward for ants that disperse them?

8. Some violets produce flowers that self-pollinate without opening. What is this strategy called?

9. What is the swollen leaf-base joint whose pressure changes can move a leaf or leaflet?

10. Which small structures in woody bark permit gas exchange with the air?

11. On a loom, what is the name for the lengthwise yarn system held in place before crosswise yarn is added?

12. What is the self-finished lengthwise edge of woven fabric called?

13. Which surface feature is characteristic of a twill weave?

14. At what angle to both warp and weft is the true bias of a square-woven fabric cut?

15. What is a gusset’s main role when inserted into a garment seam?

16. What does a stitched dart primarily do in garment construction?

17. Velvet’s raised surface belongs to which structural fabric category?

18. Which cotton-finishing process traditionally uses concentrated sodium hydroxide to improve luster and dye affinity?

19. In ikat production, when is the resist-dyed pattern put onto the yarns?

20. Which finishing process deliberately consolidates wool cloth through moisture, friction and pressure?

21. In furniture joinery, what is the recess cut to receive a tenon called?

22. A saw removes a narrow strip of material as it travels through a board. What is the resulting cut called?

23. A square corner on a wooden edge is replaced with a narrow, flat bevel. What feature has been made?

24. Which woodworking cut forms a step-shaped recess along the edge of a board?

25. Which operation creates a conical recess so a flat-head screw can sit flush with a surface?

26. Which decorative technique forms pictures or patterns from thin pieces of wood veneer?

27. Which sawing method aims for growth rings that meet a board’s broad face nearly at right angles?

28. What causes the contrasting lines and discoloration prized in spalted wood?

29. What is exposed when a wooden board is cut across its length, perpendicular to the fibers?

30. Which interlocking joint uses flared, wedge-shaped tails that resist being pulled straight apart?

31. Which term describes vision in very dim light, when rod cells dominate?

32. What is the rapid eye movement that shifts fixation from one point to another called?

33. What is the eye’s adjustment of lens shape to focus on objects at different distances called?

34. Which small central depression in the retina is specialized for sharp, detailed vision?

35. What term describes depth perception arising from the slightly different views supplied by the two eyes?

36. A flash of light is perceived even though no light entered the eye. What is this sensation called?

37. In linear dichroism, a material absorbs light differently according to which property?

38. Which optical property lets a suitable crystal split one incident beam into two differently polarized rays?

39. Which term describes the age-related reduction in the eye’s ability to focus on nearby objects?

40. What is the general name for coordinated eye movements in opposite directions to align on a target?