Fill in the blank
1. Pteridophytes are commonly known as __________ plants.
2. Pteridophytes are the first terrestrial plants to possess __________ tissues.
3. The conducting tissues in pteridophytes are __________ and __________.
4. Pteridophytes usually grow in cool, damp and __________ places.
5. The dominant phase in pteridophytes is the __________.
6. The sporophyte is differentiated into true roots, stem and __________.
7. Small leaves in pteridophytes are called __________.
8. Microphylls are found in __________.
9. Large leaves in pteridophytes are called __________.
10. Sporangia are borne on specialised leaves called __________ 11. Compact cone-like structures formed by sporophylls are called __________.
12. __________ and Equisetum bear strobili.
13. Spores in pteridophytes are produced by __________ division.
14. The gametophyte of pteridophytes is called __________.
15. The prothallus is small, multicellular and __________.
16. Water is essential for __________ in pteridophytes.
17. The male sex organ in pteridophytes is called __________.
18. The female sex organ in pteridophytes is called __________.
19. Male gametes in pteridophytes are called __________.
20. Fusion of male and female gametes forms a __________.
21. Homosporous pteridophytes produce only __________ type of spore.
22. Heterosporous pteridophytes produce microspores and __________.
23. __________ is an example of a heterosporous pteridophyte.
24. __________ is an aquatic heterosporous pteridophyte.
25. Megaspores develop into the __________ gametophyte.
26. Microspores develop into the __________ gametophyte.
27. Heterospory is a precursor to __________ habit.
28. Psilotum belongs to the class __________.
29. Equisetum belongs to the class __________.
30. __________ and Adiantum are common examples of ferns.