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Biology · 2023 · 2 marks
CBSE 2023 · Region 5 · Set 2 · Q18
(a) (i) Give an example of a genus of fungi that forms mycorrhizial association with plants. (ii) How does the plant derive benefits from this…
(a)(i)
Give an example of a genus of fungi that forms mycorrhizial association with plants.
(ii)
How does the plant derive benefits from this association?
OR
(b)
Name any two techniques used to detect the cancer of internal organs and write about any one of them.
Marking-scheme solution
(i)
Glomus (or any other correct example)
(ii)
It absorbs phosphorus from soil and gives to plants, tolerance to salinity/drought, resistance to root borne pathogens, increase in plant growth and development.
Biopsy (followed by further examination)/ histopathological studies, radiography, computed tomography/CT, magnetic resonance imaging/MRI
In biopsy a piece of the suspected tissue cut into thin sections is stained and examined under microscope (histopathological studies) by a pathologist/ Radiography is use of X-rays to detect cancer/ Computed Tomography uses X-Rays to generate a three-dimensional image of the internals of an object/ MRI uses strong magnetic fields and non-ionising radiation to accurately detect pathological and physiological changes in the living tissue.
All Microbes in Human Welfare questions2023 question paperNCERT solutions: Microbes in Human WelfarePractice Microbes in Human Welfare →
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.