Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:
Sturtevant (Morgan's student) constructed the first genetic linkage map.
Identify the pair of heterosporous pteridophytes among the following:
Selaginella and Salvinia are heterosporous; the others are homosporous.
What is the role of RNA polymerase III in the process of transcription in Eukaryotes?
RNA Pol I → large rRNAs, Pol II → hnRNA/mRNA, Pol III → tRNA + 5S rRNA + snRNAs.
Expressed Sequence Tags (ESTs) refers to:
ESTs are short sequences from mRNA → represent expressed (protein-coding) genes.
Cellulose does not form blue colour with Iodine because:
Starch traps I₂ in its helix → blue. Cellulose lacks such a helix → no colour.
A: ATP is used at two steps in glycolysis. R: First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1,6-diphosphate.
Hexokinase (Glc→Glc-6-P) and PFK (F-6-P→F-1,6-BP) each consume one ATP.
The phenomenon of pleiotropism refers to:
Pleiotropy = one gene → multiple phenotypic effects.
Identify the correct statements:
A. Detrivores perform fragmentation. B. The humus is further degraded by some microbes during mineralization. C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching. D. The detritus food chain begins with living organisms. E. Earthworms break down detritus into smaller particles by a process called catabolism.
D wrong (detritus food chain starts with DEAD organic matter); E wrong (earthworms perform fragmentation, not catabolism).
The thickness of ozone in a column of air in the atmosphere is measured in terms of:
Ozone column is measured in Dobson units (DU).
Statement I: The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height. Statement II: Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling.
Both NCERT-stated facts about transpiration are correct.
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