NEET · Biology · STD 11 - 2. Biology classification

Which of the following is incorrect about Cynobacteria?

A They have chiorophyll 'a' similar to green plants
B They are photoautotrophs
C They lack heterocysts
D They often form blooms in polluted water bodies

Verified Solution

Answer & Solution

Correct Answer

(C) They lack heterocysts

Step-by-step Solution

Detailed explanation

Cynobacteria have heterocyst that fixes atmospheric nitrogen to ammenia.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List \(I\) with List \(II\) :

List \(I\)	List \(II\)
\(A.\) Fibrous joints	\(I.\) Adjacent vertebrae, limited movement
\(B.\) Cartilaginous joints	\(II.\) Humerus and Pectoral girdle, rotational movement
\(C.\) Hinge joints	\(III.\) Skull, don't allow any movement
\(D.\) Ball and socket joints	\(IV.\) Knee, help in locomotion

Choose the correct answer from the options given below :

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(a) Zygotene	(i) Terminalization
(b) Pachytene	(ii) Chiasmata
(c) Diplotene	(iii) Crossing over
(d) Diakinesis	(iv) Synapsis

Column\(-I\)	Column\(-II\)
\((a)\) Basal	\((i)\) Mustard
\((b)\) Axile	\((ii)\) China rose
\((c)\) Parietal	\((iii)\) Dianthus
\((d)\) Free central	\((iv)\) Sunflower