Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem. R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.
Both correct; condensed internodes give floral whorls instead of leaves at successive nodes.
A: In gymnosperms the pollen grains are released from the microsporangium and carried by air currents. R: Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
A is true (wind dispersal). R is false — gymnosperms DO form pollen tubes (siphonogamy).
Match List I (Interaction) with List II (Species A and B):
| List I | List II |
|---|---|
| A. Mutualism | I. +(A), O(B) |
| B. Commensalism | II. -(A), O(B) |
| C. Amensalism | III. +(A), -(B) |
| D. Parasitism | IV. +(A), +(B) |
Mutualism +/+; Commensalism +/0; Amensalism −/0; Parasitism +/−.
Main steps in the formation of Recombinant DNA are given below. Arrange these steps in a correct sequence:
A. Insertion of recombinant DNA into the host cell. B. Cutting of DNA at specific location by restriction enzyme. C. Isolation of desired DNA fragment. D. Amplification of gene of interest using PCR.
Isolate → Cut → Amplify → Insert: C, B, D, A.
Statement I: Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually. Statement II: In general, carnivores are more adversely affected by competition than herbivores.
Both true per NCERT (carnivores at higher trophic levels are more sensitive to competition).
Match List I with List II:
| List I | List II |
|---|---|
| A. Oxidative decarboxylation | I. Citrate synthase |
| B. Glycolysis | II. Pyruvate dehydrogenase |
| C. Oxidative phosphorylation | III. Electron transport system |
| D. Tricarboxylic acid cycle | IV. EMP pathway |
A-II (PDH), B-IV (EMP), C-III (ETS), D-I (citrate synthase = first enzyme of TCA).
Which one of the following statements is NOT correct?
Algal blooms DETERIORATE water quality (block sunlight, deplete O₂); option B is wrong.
Match List I with List II:
| List I | List II |
|---|---|
| A. M Phase | I. Proteins are synthesized |
| B. G₂ Phase | II. Inactive phase |
| C. Quiescent stage | III. Interval between mitosis and initiation of DNA replication |
| D. G₁ Phase | IV. Equational division |
M phase = equational division; G₂ = proteins synth; Quiescent = inactive (G₀); G₁ = between M and S.
The cofactor of the enzyme carboxypeptidase is:
Carboxypeptidase is a Zn²⁺-containing metalloenzyme.
Given below are two statements:
Statement I: Parenchyma is living but collenchyma is dead tissue.
Statement II: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.
In the light of the above statements, choose the correct answer from the options given below:
Both parenchyma and collenchyma are living tissues (only sclerenchyma is dead) — Statement I is false. Statement II is a standard NCERT fact.
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