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1. Which of the following is responsible for Earths Magnetic Field
a. Inner core
b. Mantle
c. Outer core
d. Crust
(Why important:
2. Consider the following options about Mycorrhiza
1. Its a combination of fungi and bacterial micro organism
2. They have symbiotic association with the roots of plants
3. It helps in providing protection from soil-born pathogenic
4. It is also used as biofertilizer
Which of the following option is correct
a. 2 & 4
b. 1,2,3
c. 2,3,4
d. 1,2,3,4
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