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:

List $I$ $(syndrome)$

$(1)$ Patau’s syndrome

$(2)$ Kline-Felter’s syndrome

$(3)$ Down’s syndrome

$(4)$ Turner’s syndrome

List $II$ $(Chromosomal\, abnormality)$

$(A)$ $44 + XXY = 47$

$(B)$ $44 + X = 45$

$(C)$ $46 + 1 = 47$, Chromosome $13^{th}$

$(D)$ $46 + 1 = 47$, Chromosome $21^{st}$ Code