Find the odd example.

Match the following columns.

$a$. Cellular level of organisation	$1$. Cnidarians
$b$. Organ level of organisation	$2$. Platyhelminthes
$c$. Organ system level of organisation	$3$. Chordates
$d$. Tissue level of organisation	$4$. Porifera

Select the correct sequence for $a, b, c, d$.

Which of the following animals does not belong to the phylum $Mollusca$?

Select the correct option matching the columns $A, B$, and $C$:

$A$	$B$	$C$
$(1)$ Tube feet	$(a)$ Helps in digestion	$(e)$ Mollusca
$(2)$ Radula	$(b)$ Helps in balance	$(f)$ Echinodermata
$(3)$ Statocyst	$(c)$ Helps in locomotion	$(g)$ Annelida
$(4)$ Setae	$(d)$ Water vascular system	$(h)$ Arthropoda

Assertion: All birds,except the ones like koel (cuckoo),build nests for retiring and taking rest during night time (day time for nocturnal).
Reason: Koel lays its eggs in the nests of tailor bird.

Prepare a list of some animals that are found parasitic on human beings.