MCQ
Which of the following is a nitrogen fixer
- AUlothrix
- ✓Anabaena
- CUlva
- DHydrodictyon
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$(i)$ Head is formed by the fusion of $6$ -segments.
$(ii)$ Mouth parts are biting and chewing type.
$(iii)$ Crop is the part of mid gut.
$II.$ Differentiation
$III.$ Maturation
$IV.$ Senescence
Identify the correct sequence of the following events occurring in plants and choose the correct option accordingly