AIIMS 2017
- Exam
- AIIMS
- Year
- 2017
- Subject
- Botany
- Chapter
- Biological Classification
AIIMS 2017 · Botany · Biological Classification
Assertion : Endomycorrhiza of forest trees contribute to the...
Assertion : Endomycorrhiza of forest trees contribute to the efficient nutrient cycling in tropical forest ecosystems.
Reason: The fungi that form endo-mycorrhizal associations with plants make nutrient ions available to them.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
A. If both assertion and reason are true and reason is the correct explanation of assertion.
Step-by-step solution
The fungi of endomycorrhiza invade the cells of the root cortex, with a portion lying externally as a loose mass of hyphae in the soil. Mycorrhiza cause considerable stimulation of growth in nutrient deficient soil. The greatest stimulation occurs in the uptake of phosphates. Mycorrhiza can take up phosphate at that low concentrations at which they are unavailable to nonmycorrhizal roots.