MCQ
Which is not a feature of dinoflagellates?
- AThey cause red tides
- BTheir cell wall has stiff cellulose plates on the outer surface
- CThey release toxins
- ✓These are mostly fresh water and non-photosynthetic
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$I.$ In gymnosperms, the male and female gametophytes have an independent existence.
$II.$ The multicellular female gametophyte is retained within the megasporangium.
$III.$ The gymnosperms are heterosporous.
Of these statements