MCQ
Antigen is a substance which
- Alowers body temperature
- Bdestroys harmful bacteria
- ✓triggers the immune system
- Dis used as an antidote to poison
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$(1)$ Decomposition is largely an oxygen -requiring process.
$(2)$ Warm and moist environment slow down decomposition process.
$(3)$ Decomposition rate is slower if detritus is rich in lignin and chitin
$(4)$ Humus is colloidal in nature it serves as are servoir of nutrients.