Human Reproduction — BIOLOGY STD 12 Science — Question

$i. r-RNA$ 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.

$(1)$ Decomposition is largely an oxygen -requiring process.

$(2)$ Warm and moist environment slow down decomposition process.

$(3)$ Decomposition rate is slower if detritus is rich in lignin and chitin

$(4)$ Humus is colloidal in nature it serves as are servoir of nutrients.