MCQ
In pteridophytes, spores germinate to give rise to
- ✓Prothallus
- BProtonema
- CLeafy stage
- DStrobili
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Statements:
$A.$ On dry land it would die due to lack of O_2 if its mouth is forcibly kept closed for a few days.
$B.$ It has fourchambered heart.
$C.$ On dry land it turns uricotelic from ureotelic.
$D.$ Its lifehistory is carried out in pond water.
$(i)$ Unicellular, colonial, filamentous, symbiotic or free living.
$(ii)$ The colonies are surrounded by a gelatinous sheath.
$(iii)$ Some can fix atmospheric nitrogen in specialized cells called heterocysts.
$(iv)$ They often form blooms in water bodies.