MCQ
What are species that invade a bare area known as?
- APrimary consumers
- BApex species
- ✓Pioneer species
- DProducers
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| Column $- I$ | Column $- II$ | ||
| $(a)$ | Gluconic acid | $(i)$ | Trichoderma koenigii |
| $(b)$ | Vitamin $B_{12}$ | $(ii)$ | Streptomyces erythreus |
| $(c)$ | Erythromycin | $(iii)$ | Pseudomonas denitrificans |
| $(d)$ | Cellulase | $(iv)$ | Aspergillus niger |