Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and down stream end:
A transcription unit = promoter (upstream) — structural gene — terminator (downstream).
Which one of the following is not a criterion for classification of fungi?
Fungi are classified by morphology of mycelium, mode of spore formation and fruiting body — not by nutrition (all are heterotrophic).
In the given figure of a stoma in transverse section, which component has thin outer walls and highly thickened inner walls? (Labels A, B, C, D mark four parts; B marks the guard cells.)
Guard cells (B) have unevenly thickened walls — thin outer, thick inner — enabling stomatal opening.
Match List I with List II.
| List I (Types of Stamens) | List II (Example) |
|---|---|
| A. Monoadelphous | I. Citrus |
| B. Diadelphous | II. Pea |
| C. Polyadelphous | III. Lily |
| D. Epiphyllous | IV. China-rose |
Choose the correct answer from the options given below:
Monoadelphous — China rose (one bundle); Diadelphous — Pea; Polyadelphous — Citrus; Epiphyllous — Lily (stamens fused to perianth).
The DNA present in chloroplast is:
Chloroplast (and mitochondrial) DNA is circular and double-stranded — like prokaryotic DNA.
Read the following statements and choose the set of correct statements:
In the members of Phaeophyceae,
A. Asexual reproduction occurs usually by biflagellate zoospores.
B. Sexual reproduction is by oogamous method only.
C. Stored food is in the form of carbohydrates which is either mannitol or laminarin.
D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.
E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
Choose the correct answer from the options given below:
Phaeophyceae show isogamous, anisogamous or oogamous reproduction — not only oogamous; B is false.
Match List I with List II.
| List I | List II |
|---|---|
| A. Citric acid cycle | I. Cytoplasm |
| B. Glycolysis | II. Mitochondrial matrix |
| C. Electron transport system | III. Intermembrane space of mitochondria |
| D. Proton gradient | IV. Inner mitochondrial membrane |
Choose the correct answer from the options given below:
TCA — matrix; glycolysis — cytoplasm; ETS — inner membrane; H⁺ gradient — intermembrane space.
Given below are two statements:
Statement I: In $C_3$ plants, some $O_2$ binds to RuBisCO, hence $CO_2$ fixation is decreased.
Statement II: In $C_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:
Both standard NCERT facts about C₃/C₄ photorespiration.
Which of the following statement is correct regarding the process of replication in E. coli?
All known DNA polymerases extend the new strand strictly in the $5' \to 3'$ direction.
Match List I with List II.
| List I | List II |
|---|---|
| A. Robert May | I. Species-Area relationship |
| B. Alexander von Humboldt | II. Long term ecosystem experiment using out door plots |
| C. Paul Ehrlich | III. Global species diversity at about 7 million |
| D. David Tilman | IV. Rivet popper hypothesis |
Choose the correct answer from the options given below:
May — 7 million species; Humboldt — species-area; Ehrlich — rivet-popper; Tilman — long-term plots.
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