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What is the main function of the spindle fibers during mitosis?
Spindle fibres attach to centromeres and pull the sister chromatids (chromosomes) to opposite poles during mitosis.
Which one of the following is the characteristic feature of gymnosperms?
Gymnosperms ("naked seeds") bear ovules/seeds that are not enclosed within an ovary/fruit.
Match List I with List II:
List I — A. Pteridophyte, B. Bryophyte, C. Angiosperm, D. Gymnosperm
List II — I. Salvia, II. Ginkgo, III. Polytrichum, IV. Salvinia
Choose the option with all correct matches:
Pteridophyte → Salvinia (IV); Bryophyte → Polytrichum (III); Angiosperm → Salvia (I); Gymnosperm → Ginkgo (II).
Who proposed that the genetic code for amino acids should be made up of three nucleotides?
George Gamow proposed that a triplet (three-nucleotide) code is required to specify the 20 amino acids.
Match List I with List II:
List I — A. The Evil Quartet, B. Ex situ conservation, C. Lantana camara, D. Dodo
List II — I. Cryopreservation, II. Alien species invasion, III. Causes of biodiversity losses, IV. Extinction
Choose the option with all correct matches:
The Evil Quartet → causes of biodiversity losses (III); Ex situ conservation → cryopreservation (I); Lantana camara → alien species invasion (II); Dodo → extinction (IV).
In bryophytes, the gemmae help in which one of the following?
Gemmae are specialised asexual reproductive bodies (in gemma cups) by which bryophytes reproduce vegetatively.
Given below are two statements:
Statement I: In ecosystem, there is unidirectional flow of energy of sun from producers to consumers.
Statement II: Ecosystems are exempted from 2nd law of thermodynamics.
In the light of the above statements, choose the most appropriate answer:
Energy flow is unidirectional (I correct). Ecosystems obey the laws of thermodynamics, including the second law, so they are not exempted (II incorrect).
Which of the following statements about RuBisCO is true?
RuBisCO catalyses the carboxylation of RuBP (fixing CO₂) in the Calvin cycle; it actually has a greater affinity for CO₂ than O₂.
Read the following statements on plant growth and development. A. Parthenocarpy can be induced by auxins. B. Plant growth regulators can be involved in promotion as well as inhibition of growth. C. Dedifferentiation is a pre-requisite for re-differentiation. D. Abscisic acid is a plant growth promoter. E. Apical dominance promotes the growth of lateral buds. Choose the option with all correct statements:
A, B and C are correct. D is wrong (ABA is an inhibitor/stress hormone) and E is wrong (apical dominance suppresses lateral bud growth).
Which factor is important for termination of transcription?
The rho (ρ) factor is the termination factor required to end transcription in prokaryotes; the sigma (σ) factor is for initiation.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.