Which are the organisms help in nitrogen fixation of lichens:
A. Anabaena and Nostoc
B. Anabaena alone
C. Nostoc alone
D. Anabaena azollae
Answer:A
Which are the organisms help in nitrogen fixation of lichens:
A. Anabaena and Nostoc B. Anabaena alone C. Nostoc alone D. Anabaena azollae