Question

Mycorrhiza shows symbiotic association between ___________.

• A. Coralloid roots of Cycas and cyanobacteria
• B. Roots of lower leguminous plants and fungi
• C. Roots of grasses and bacteria
• D. Roots of higher plants and fungi

Hint:

Mycorrhiza helps plants survive better in nutrient-poor soils by enhancing mineral uptake.

Answer 1

The Correct Option is D

Step 1: Understanding mycorrhiza.
Mycorrhiza is a mutualistic (symbiotic) association between the roots of plants and certain fungi, where both partners benefit.
Step 2: Benefits to both partners.
The fungal partner increases the surface area for absorption, helping the plant absorb water and minerals (especially phosphorus).
In return, the plant provides carbohydrates to the fungus.
Step 3: Analysis of options.
(A) Incorrect — coralloid roots of Cycas associate with cyanobacteria (Nostoc/Anabaena).
(B) Incorrect — leguminous plants associate with bacteria (Rhizobium), not fungi.
(C) Incorrect — grasses do not form mycorrhiza with bacteria.
(D) Correct — mycorrhiza is an association between roots of higher plants and fungi.
Step 4: Conclusion.
Mycorrhiza shows a symbiotic association between roots of higher plants and fungi.