MCQ
Plant fibres can originate from
- ✓Phloem, xylem, epidermis and sclerenchyma tissues
- BPhloem, xylem and sclerenchyma tissues
- CPhloem, xylem and epidermis tissues
- DXylem, epidermis and sclerenchyma tissues
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$(I)$ Central nervous system is ventral, solid and double
$(II)$ Gill slits are absent
$(III)$ Heart is ventral
$(IV)$ Post anal tail is absent