MCQ
A flat, membrane sac like structure is organised in the petiole, which is called:
- ✓Thylakoid
- BPlastid
- CRibosome
- DMitochondria
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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