Home
Class 11
BIOLOGY
N(2)-fixing blue-green alga Anabaena whi...

`N_(2)`-fixing blue-green alga Anabaena which is extensively used in rice cultivation, forms symbiotic association with

A

Cycas roots

B

Azolla

C

Anthoceros

D

Alnus

Text Solution

Verified by Experts

The correct Answer is:
B
Symbiotic assiciation has been found between Anabaena (blue green alga) and Azolla (a water fern). Azolla pinnata has anabeana azollae in its fronds. It is often inoculated to rice fields for nitrogen fixationl. It is an efficient fertiliser of paddy fierlds. Estimates of the annual quantities of `N_(2)` fixed by Azolla range between 120 and 312 kg nitrogen per hactare.
Promotional Banner

Similar Questions

Explore conceptually related problems

Choose correct statement(s) about ''Azolla': (I) Azolla is a free-floating water fern. (II) Azolla fixes the atmospheric nitrogen in association with nitrogen fixing blue green alga Anabaena azollae. (III) It is used as a bio-fertilizer for wetland rice cultivation. (IV) Not suitable for rice crop.

A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern Azolla ………….. .

Identify the incorrect statement: (i) SLF is obtained from kelps - a brown algae. (ii) Azolla is a fern. (iii) Rhizobium is found in association with root nodules. (iv) AM forms symbiotic relation with angiospermic roots.

Which is of the following is not free living N_2 fixing organism?

Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?

Study the following statements and select the correct ones (i) Methanogens are archeabacteria which produce methane in marshy areas (ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen. (iii) Many members of the genus Glomus form mycorrhiza.

Cyanobacteria /Blue green algae used as bio fertilizer _______