Microorganisms: Friend and Foe-Nitrogen Fixation [CBSE (Central Board of Secondary Education) Class-8 Science]: Questions 1 - 4 of 5
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Question 1
Question MCQ▾
Nitrogen cycle is also called a perfect cycle because
Choices
Choice (4) | Response | |
---|---|---|
a. | Concentration of nitrogen in atmosphere always changing | |
b. | Concentration of nitrogen in atmosphere is same at nights | |
c. | Concentration of nitrogen in atmosphere always remain same | |
d. | Concentration of nitrogen is same at day |
Question 2
Question MCQ▾
Fixation of Nitrogen is:
Choices
Choice (4) | Response | |
---|---|---|
a. | The process of conversion of free nitrogen into compounds of nitrogen. | |
b. | Release of ammonia after death or decay of plant bodies. | |
c. | Free nitrogen present in the atmosphere. | |
d. | Conversion of nitrogen into amino acids and proteins by the plants |
Question 3
Question MCQ▾
Nitrification is the process of conversion of
Choices
Choice (4) | Response | |
---|---|---|
a. | Conversion of animals excretory product into ammonia | |
b. | Conversion of ammonia into nitrites then to nitrates | |
c. | The process of conversion of free nitrogen into its compounds | |
d. | Conversion of nitrites and nitrates from soil back to air |
Question 4
Question MCQ▾
Bacteria used in converting ammonia products in to ammonia are
Choices
Choice (4) | Response | |
---|---|---|
a. | Nitrobacter bacteria | |
b. | Pseudomonas | |
c. | Putrefying bacteria | |
d. | Nitrosomonas bacteria |