Biological Classification And System Of Classification Question 78
Question: Farmers have reported over 50% higher yields of rice by using which of the following biofertilizer
[MP PMT 1997; CBSE PMT 1993, 98, 99]
Options:
A) Mycorrhiza
B) Azolla pinnata
C) Cyanobacteria
D) Legume-Rhizobium symbiosis
Show Answer
Answer:
Correct Answer: C
Solution:
Farmers have reported over 50% higher yields of rice, by using Azolla pinnata as biofertilizer.
Azolla is a free-floating water fern that floats in water and fixes atmospheric nitrogen in association with nitrogen fixing blue green alga Anabaena azollae.
Azolla fronds consist of sporophyte with a floating rhizome and small overlapping bi-lobed leaves and roots.
Rice growing areas in South East Asia and other third World countries have recently been evincing increased interest in the use of the symbiotic $N_2$ fixing water fern Azolla either as an alternate nitrogen source or as a supplement to commercial nitrogen fertilizers.
Azolla is used as biofertilizer for wetland rice and it is known to contribute 40-60 kg N/ha per rice crop.
BETA
