STD 11 - 4. Animal kingdom — BIOLOGY STD 11 Science — Question

$I$.In $C_{4}$-plants, the primary $C O_{2}$ acceptor is $P E P$.

$II$. In the photosynthetic process, PS-II absorbs energy at or just below $680 \;nm$.

$III$. The pigment that is present in the Pigment System-$I$ is $P$ $680$ .

$(a)$ Metagenesis is observed in Helminths.

$(b)$ Echinoderms are triploblastic and coelomate animals.

$(c)$ Round worms have organ-system level of body organization.

$(d)$ Comb plates present in ctenophores help in digestion.

$(e)$ Water vascular system is characteristic of Echinoderms.

Choose the correct answer from the options given below.