22. Unique features of bryophytes is that they
(a) produce spores
(b) have sporophyte attached to gametophyte
(c) lack roots
(d) lack vascular tissues
23. Which of the following cannot fix nitrogen ?
(a) Nostoc (b) Azotobacter
(c) Spirogyro (d) Anabaena
24. Agar is commercially obtained from
(a) red algae (b) green algae
(c) brown algae (d) blue-green algae
25. The absence of chlorophyll, in the lowermost cell of Ulothrix, shows
(a) functional fission (b) tissue formation
(c) cell characteristic (d) beginning of labour division
26. A well developed archegonium with neck consisting of 4-6 rows of neck canal cells, characterises
(a) gymnosperms only
(b) bryophytes and pteridophytes
(c) pteridophyies and gymnosperms
(d) gymnosperms and flowering plants
27. The plant body of moss (Funaria) is
(a) completely sporophyte
(b) completely gametophyte
(c) predominantly sporophyte with gametophyte
(d) predominantly gametophyte with sporophyte
28. Blue-green algae belong to
(a) eukaryotes (b) prokaryotes
(c) Rhodophyceae (d) Chlorophyceae
29. Seed habit first originated in
(a) certain ferns (b) certain pines
(c) certain monocots (d) primit ive dicots
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