Question:
Which of the following organisms cannot fix nitrogen?
A. Azotobacter
B. Oscillatoria
C. Anabaena
D. Volvox
E. Nostoc
Choose the correct answer from the options given below:
Which of the following organisms cannot fix nitrogen?
A. Azotobacter
B. Oscillatoria
C. Anabaena
D. Volvox
E. Nostoc
Choose the correct answer from the options given below:
B. Oscillatoria
C. Anabaena
D. Volvox
E. Nostoc
Choose the correct answer from the options given below:
Show Hint
Many cyanobacteria, like Anabaena and Nostoc, have specialized cells called heterocysts that help them fix nitrogen. Organisms like Volvox do not possess this ability.
Updated On: Mar 19, 2026
- D only
- B only
- E only
- A only
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Let's analyze the organisms:
A. Azotobacter is a nitrogen-fixing bacterium, so it can fix nitrogen.
B. Oscillatoria is a type of cyanobacteria (blue-green algae) and can fix nitrogen.
C. Anabaena is also a nitrogen-fixing cyanobacterium.
D. Volvox is a green alga that cannot fix nitrogen. It relies on the environment for nitrogen and does not have the ability to fix it.
E. Nostoc is a nitrogen-fixing cyanobacterium. Thus, the correct answer is D only.
B. Oscillatoria is a type of cyanobacteria (blue-green algae) and can fix nitrogen.
C. Anabaena is also a nitrogen-fixing cyanobacterium.
D. Volvox is a green alga that cannot fix nitrogen. It relies on the environment for nitrogen and does not have the ability to fix it.
E. Nostoc is a nitrogen-fixing cyanobacterium. Thus, the correct answer is D only.
Was this answer helpful?
1
0
Top NEET Biology Questions
- In spite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
- Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?
- Mutations in plant cells can be induced by :
- Chordae tendineae are found in
- Glycolysis takes place in
View More Questions
Top NEET Questions
- In spite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
- A coil of inductive reactance $31\, \Omega$ has a resistance of 8 $\Omega$. It is placed in series with a condenser of capacitative reactance $25 \,\Omega$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is :-
- A car starts from rest and accelerates at $5\, m / s ^{2}$ At $t=4\, s$, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at $t =6\, s$ ? (Take $\left. g =10\, m / s ^{2}\right)$
- A liquid compound (x) can be purified by steam distillation only if it is
- In an a.c. circuit with phase voltage V and current I, the power dissipated is
View More Questions