MCQ
Radioactive pollution along Kerala coast is due to:
- AZinc
- ✓Thorium
- CCaesium
- DPlutonium
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Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.
| Column $- I$ | Column $- II$ |
| (a) Saprophyte | (i) Symbiotic association of fungi with plant roots |
| (b) Parasite | (ii) Decomposition of dead organic materials |
| (c) Lichens | (iii) Living on living plants or animals |
| (d) Mycorrhiza | (iv) Symbiotic association of algae and fungi |
Choose the correct answer from the options given below
$(a)\quad (b)\quad (c)\quad (d)$