A biofertilizer which involves a pteridophyte host is

1.A biofertilizer which involves a pteridophyte host is
(a) Rhizobium
(b) Anabaena
(c) Clostridium
(d) Azotobacter
Answer: (b)

2.A fern commonly inoculated to paddy fields is
(a) Azolla
(b) Marsilea
(c) Salvinia
(d) Anabaena
Answer: (a)

3.A free living nitrogen fixing bacterium is
(a) Clostridium
(b) Azotobacter
(c) Rhizobium
(d) Both A and B
Answer: (d)

4.A free living nitrogen fixing cyanobacterium which can also form symbiotic association with Azolla is
(a) Nostoc
(b) Anabaena
(c) Tolypothrix
(d) Gleocapsa
Answer: (b)

5.A medicine for bronchitis is got from
(a) Rauwolfia serperntina
(b) Curcuma longa
(c) Adhatoda vasica
(d) Hemidesmus indicus
Answer: (c)

6.A neem product used as insect repellent is
(a) Azardirachtin
(b) Rotenone
(c) Endrin
(d) Parathion
Answer: (a)

7.A nitrogen fixing blue green alga is
(a) Ulothrix
(b) Spirogyra
(c) Anabaena
(d) Rhizobium
Answer: (c)

8.A piosnous mushroom among the following is
(a) Agaricus bisporus
(b) Morchella esculenta
(c) Hydnum sp.
(d) Amanita sp.
Answer: (d)

9.A plant effective in ensuring safe delivery ans prevent abortions is
(a) Azadirachta
(b) Ocimum
(c) Adhatoda
(d) Asparagus
Answer: (d)

10.A quatic fern which is an excellent biofertilizer
(a) Salvinia
(b) Azolla
(c) Marsilea
(d) Pteridium
Answer: (b)