Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which micronutrient is required for splitting of water molecule during photosynthesis?
The OEC of PSII has a Mn₄CaO₅ cluster that oxidises water.
Given below are two statements:
Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer:
Endarch in stems (protoxylem inside), exarch in roots (protoxylem outside).
Assertion A: Late wood has fewer xylary elements with narrow vessels. Reason R: Cambium is less active in winters.
Lower cambial activity in winter produces narrower, fewer xylem vessels.
During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out:
Chilled ethanol selectively precipitates DNA as fine threads.
In gene gun method used to introduce alien DNA into host cells, microparticles of _____ metal are used.
Biolistic gun uses tungsten or gold microparticles coated with DNA.
The historic Convention on Biological Diversity, 'The Earth Summit' was held in Rio de Janeiro in the year:
CBD adopted at the Rio Earth Summit, 1992.
In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:
Synergids (n) — Zygote (2n) — PEN (3n). Sequence: haploid, diploid, triploid.
Upon exposure to UV radiation, DNA stained with ethidium bromide will show:
EtBr-stained DNA fluoresces bright orange under UV.
Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.
Fabaceae has diadelphous (9+1) stamens with dithecous anthers.
Which hormone promotes internode/petiole elongation in deep water rice?
Gibberellin (GA₃) promotes internode elongation in submerged deepwater rice.
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