83.

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Across
  1. 2. Branch of physics concerned with the physical properties of sound and sound waves (9)
  2. 5. Sweet-smelling deciduous tree, also called 'linden' (4)
  3. 7. The point in religious belief is the exercise of absolute power (9)
  4. 8. Evergreen tree also called bay (6)
  5. 10. Indian tree, also called a bo tree, resembling the banyan and regarded as sacred by Buddhists
  6. 11. Vocalist who scales the heights
  7. 13. LEAP A term for a sudden increase based on a branch of physics (7,4)
  8. 15. Beginning to grapple with one branch of physics, and the science of food (10)
  9. 16. Tree also called a custard apple
  10. 17. ___ palm (tree also known as the pinang)
  11. 19. Branch of physics that studies the properties of light (6)
  12. 21. Tropical American tree also called Guaiacum whose hard, dense wood is used for ship construction (6,5)
  13. 22. Tree also called an Indian bean
  14. 23. Absolute ___ (bottom of the Kelvin scale)
  15. 24. Tree also called the sugar apple
  16. 27. Tree also called basswood
Down
  1. 1. Ornamental Chinese seed-bearing tree also called the Maidenhair Tree
  2. 3. Mad on chemistry possibly and a particular branch of physics (14)
  3. 4. Scale the centre of Special Branch (5)
  4. 6. Tree also known as the trembling poplar
  5. 9. The branch of physics dealing with electricity that is not in motion (14)
  6. 12. ELDER North American tree also called an ash-leaved maple (3,5)
  7. 14. BOX Eucalyptus tree, also called the but-but (5, 3)
  8. 17. Little brother gets nothing and the MO turns his back on the sweep (5)
  9. 18. One of the five moons of Pluto with Charon, Kerberos, Nix and Styx (5)
  10. 20. With scales, the first of them as a tailless 12 (8)
  11. 25. When it comes to tendencies, Don loses nothing and the rest tag along (6)
  12. 26. Tropical tree also called pimento (8)