JAN STEM

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Across
  1. 1. the destruction of large areas of the natural environment as a consequence of human activity
  2. 5. a tropism in which light is the orienting stimulus
  3. 8. thorough destruction involving extensive loss of life especially through fire
  4. 11. a branch of biology concerned with the search for life outside the earth and with the effects of extraterrestrial environments on living organisms
  5. 12. represented on a coat of arms in a lying position with the head on the forepaws
Down
  1. 2. capable of destroying or eating away by chemical action
  2. 3. a lover of books especially for qualities of format
  3. 4. a person who seeks wisdom or enlightenment
  4. 6. a saprophytic organism
  5. 7. pronounced and usually negative phototaxis or phototropism
  6. 9. a new convert
  7. 10. a room for sleeping