Which feature of some species of blue- green algae helps promote them as bio-fertilizers ?
Options
(a)They convert atmospheric methane into ammonia which the crop plants can absorb readily
(b)They induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates
(c)They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily
(d)They induce the roots of the crop plants to absorb the soil nitrates in larger quantities
The full breakdown is part of the paid archive
This question's answer, explanation and links to every related question across 48 years (1979–2026) are inside the app. The two most recent years are free to read in full — no account needed.
Class 11Biological Classification— NCERT Biology, Chapter 2. The second chapter of NCERT's Class 11 biology book traces classification from Aristotle (trees, shrubs and herbs; red-blooded or not) and the two-kingdom system of…
Class 12Microbes in Human Welfare— NCERT Biology, Chapter 8. The eighth chapter of NCERT's Class 12 biology book, closing Unit VIII, shows microbes as helpers. Lactic acid bacteria turn milk into curd and raise its vitamin B12…
Independent UPSC previous-year-questions study tool — not affiliated with or endorsed by the UPSC. Question text is reproduced from publicly released UPSC examination papers. UPSCviaPYQs · Privacy · Terms