1.6.4-1.7

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Across
  1. 3. gymnosperms seeds are exposed on ____.
  2. 4. platyhelminthes has ____ as its excretory organ.
  3. 5. bryophytes and pteridophytes do not produce_______ .
  4. 7. gymnosperms, ________ only have tracheids, do not contain vessel element.
  5. 9. gametophyte generation is dominant in__________.
  6. 10. sponges lack body ____.
  7. 11. arthopoda has ____ circulatory system.
  8. 13. in tough ____.
  9. 15. angiosperms is complex, ___ vascular plants.
  10. 17. angiosperms do not require water for fertilisation because sperm cells are ___.
  11. 19. dominant generation for angiosperms is ____ generation (independent).
  12. 20. type of spores for angiosperms is __.
  13. 21. gametophyte generation is reduced ___ and depends on sporophyte for nutrients.
Down
  1. 1. gymnosperm and angiosperm do not require_______ in fertilization.
  2. 2. What protects the embryo in bryophytes and pteridophytes?
  3. 4. after double fertilisation, seed consist of diploid _____ and enclosed by seed coat.
  4. 6. surround notochord and nerve cord.
  5. 7. most porifera are ____.
  6. 8. some gymnosperms have thick ___ to conserve water (needle-shape leaves).
  7. 12. provides skeletal support.
  8. 14. the body of Nematoda is
  9. 16. most gymnosperms have _ on which sporangium develop.
  10. 18. cindaria have ____ on tentacles.