Question

Assertion :- Mycorrhizal association is useful for plants.
Reason :- All fungi do not show mycorrhizal association.

• A. Both assertion and reason are true and the reason is a correct explanation of the assertion
• B. Both assertion and reason are true but the reason is not the correct explanation of the assertion
• C. The assertion is true but the reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is B Both assertion and reason are true but the reason is not the correct explanation of the assertion

Mycorrhiza is a mutually beneficial or symbiotic association of a fungus with the root of a higher plant. The fungal partner absorbs nutrients for the plant and the plant provides food and shelter to the fungus. Hence, this association is useful for plants. The assertion is true.
All fungi do not show mycorrhizal association. Apart from symbiotic fungi, such as the ones belonging to genus Glomus, there are many free living fungi, which don’t show any symbiotic association. Hence, the reason is also true. But, the reason is not the correct explanation of the assertion.