Question
Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to
1. resist drought and increase absorptive area
2. tolerate extremes of PH
3. Resist disease infestation
Select the correct answer using the codes given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Answer:
D
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Explanation:
Mycorrhizal association helps plants resist drought and increases their absorptive area. The fungal hyphae extend into the soil, effectively increasing the root surface area available for water absorption. This enhances the plant's ability to withstand drought conditions.
Mycorrhizal association can help plants tolerate extremes of pH. The mycorrhizal fungi can release certain compounds that help buffer the pH of the soil and make it more suitable for plant growth, even in acidic or alkaline conditions.
Mycorrhizal association can help plants resist disease infestation. The presence of mycorrhizal fungi in the plant root system can enhance the plant's defense mechanisms against certain pathogens, thus reducing the risk of disease infestation.