NEET · Biology · STD 11 - 3. Plant kingdom

Which one of the following is the characteristic feature of gymnosperms?

A Seeds are enclosed in fruits
B Seeds are naked
C Seeds are absent
D Gymnosperms have flowers for reproduction

Verified Solution

Answer & Solution

Correct Answer

(B) Seeds are naked

Step-by-step Solution

Detailed explanation

The gymnosperms (Gymnos : naked, sperma seed) are plants in which the ovules are not enclosed by an ovary wall and remains exposed, both before and after fertilization. The seeds that develop post-fertilization, are not covered, i.e., naked.

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.

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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

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Match the following columns and select the correct option

Column \(I\)	Column \(II\)
(\(a\)) Smooth endoplasmic reticulum	(\(i\)) Protein synthesis
(\(b\)) Rough endoplasmic reticulum	(\(ii\)) Lipid synthesis
(\(c\)) Golgi complex	(\(iii\)) Glycosylation
(\(d\)) Centriole	(\(iv\)) Spindle formation

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Match the organisms in Column\(-I\) with habitats in Column\(-II\)

Column\(-I\)	Column\(-II\)
\((a)\) Halophiles	\((i)\) Hot springs
\((b)\) Thermoacidophiles	\((ii)\) Aquatic environment
\((c)\) Methanogens	\((iii)\) Guts of ruminants
\((d)\) Cyanobacteria	\((iv)\) Salty area

Select the correct answer from the options given below

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