MCQ
Who proposed the "Cell theory''
- ✓Schleiden and Schwann
- BWatson and Crick
- CMendel and Morgan
- DRobert Hooke
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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