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Applications of Biotechnology

Aname the nit...

Question

A)name the nitrogen fixing cells of nostoc and anabaena?(1mark)

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Solution

Heterocyst. Heterocysts are specializednitrogen-fixing cells formed during nitrogenstarvation by some filamentouscyanobacteria, such as Nostoc punctiforme, Cylindrospermum , and Anabaena sphaerica.

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OscillatoriaAnabaena and Nostoc are ________ which fix atmospheric nitrogen and improve soil fertility.

Q. An example of nitrogen fixing bacteria is
(a) Nostoc.
(b) spirilla.
(c) bacillus.
(d) comma.

Q. Match the columns and choose the correct option.

	I		II
(a)	Free-living aerobic nitrogen fixers	1.	Anabaena and Nostoc
(b)	Anaerobic nitrogen fixers	2.	Pseudomonas and Thiobacillus
(c)	Nitrogen-fixing cyanobacteria	3.	Nitrosomonas and Nitrosococcus
(d)	Denitrifying bacteria	4.	Azotobacter and Beijerinckia
(e)	Nitrifying bacteria	5.	Rhodospirillum

Q. Nostoc fixes nitrogen in the symbiotic association of the following.

3. Anthoceros

The correct combination is

Q. Match the columns and choose the correct answers

	I		II
a	Free living aerobic nitrogen fixers	1	Anabaena and Nostoc
b	Anaerobic nitrogen fixers	2	Pseudomonas denitrificans and Thiobacillus denitrificans
c	Nitrogen fixing cyanobacteria	3	Nitrosomonas and Nitrococcus
d	Denitrifying bacteria	4	Azotobacter and Beijerinckia
e	Nitrifying bacteria	5	Rhodospirillum

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