MCQ
It is rich in methanogens.
- APrimary sludge
- BActivated sludge
- ✓Excreta of cattle
- DFlocs
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Reason : Low oxygen concentration is provided by leghaemoglobin.
$I.$ The outer layer of the kidney is called capsule $II.$ Kidney is divided into outer cortex and inner medulla
$III.$ Medulla is divided into medullary pyramids
$IV.$ The cortex extends in between the medullary pyramids which is called as columns of Bertini Choose the correct option accordingly
