Cell Cycle and Cell Division — BIOLOGY STD 11 Science — Question

$(a)$ 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.

$(i)$ Mycoplasma has no cell wall.

$(ii)$ Mycoplasma is the smallest living organism known.

$(iii)$ Mycoplasma cannot survive without $O_{2}$.

$(iv)$ Mycoplasma are pathogenic in animals and plants.