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Biology · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 2 · Q27
How do the following organisms act as bio-fertilisers? Explain. (a) Mycorrhiza (b) Anabaena (c) Rhizobium
How do the following organisms act as bio-fertilisers ? Explain.
(a)
Mycorrhiza
(b)
Anabaena
(c)
Rhizobium
Marking-scheme solution
(a)
Mycorrhiza (Fungal symbiont of the association) Absorb phosphorus from soil and these nutrients are passed on to the host plant.
(b)
Anabaena – Fix atmospheric nitrogen and adds organic matter to the soil, thereby increasing soil fertility.
(c)
Rhizobium – Fix atmospheric nitrogen (in leguminous plants) into organic form which is used by the plant as nutrient.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.