NEET · Biology · STD 11 - 3. Plant kingdom

Which one of the following shows isogamy with non-flagellated gametes?

A Sargassum
B Ectocarpus
C Ulothrix
D Spirogyra

Verified Solution

Answer & Solution

Correct Answer

(D) Spirogyra

Step-by-step Solution

Detailed explanation

(d) : Sexual reproduction in algae takes place through fusion of two gametes. In Spirogyra, the gametes are similar in size (isogamy) and non flagellated (nonmotile).

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) \(S\) phase	(i) Proteins are synthesized
(b) \(G_2\) phase	(ii) Inactive phase
(c) Quiescent stage	(iii) Interval between mitosis and initiation of \(DNA\) replication
(d) \(\mathrm{G}_{1}\) phase	(iv) \(DNA\) replication

Choose the correct answer from the options given below.\((a) -(b) -(c)- (d)\)

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Match the Column \(- I\) with Column \(-II\)

Column \(-I\)	Column \(-II\)
\((a)\; P-\)wave	\((i)\) Depolarisation of ventricles
\((b)\; QRS\) complex	\((ii)\) Repolarisation of ventricles
\((c)\; T-\)wave	\((iii)\) Coronary ischemia
\((d)\) Reduction in the size of \(T-\)wave	\((iv)\) Depolarisation of atria
	\((v)\) Repolarisation of atria

Select the correct option \((a)\quad (b)\quad (c) \quad (d)\)

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