STD 12 - 6. evolution — BIOLOGY STD 12 Science — Question

$A.$ 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.

Choose the correct answer from the options given below:

$(I)$ Gene flow ;

$(II)$ Genetic drift

$(III)$ Mutation

$(IV)$ Genetic recombination

$(V)$ Natural selection

The correct combination is

$i. r-RNA$ provides the template for synthesis of proteins.

$ii.$$ t-RNA$ brings amino acids and reads the genetic code.

$iii. $$RNA$ polymerase binds to promoter and initiates transcription.

$iv. $A segment of $DNA$ coding for polypeptide is called intron.