MCQ
When protoxylem develops towards the periphery, it is called
- ✓Centripetal xylem
- BCentrifugal xylem
- CEndarch
- DNone of the above
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$Y -$ Crossing over is the exchange of genetic material between two homologous chromosomes.
| Primary sludge | Activated sludge |
| (i) It is sludge formed during primary-sew-age treatment | It is sludge formed during secondary sewage treatment |
| (ii) It possesses floes of decomposer microbes | It does not posses floes of decomposer microbes |
| (iii) It does not require aeration | Formation of activated sludge requires aeration |
| (iv) A lot of decomposition occurs during formation of primary sludge | Very little decomposition occurs during formation of activated sludge |