In Ophiuroidea, branched arms are seen in:

Note the following:

(a) It is a freshwater, metamerically segmented protostome.

(b) The clitellum is absent.

(c) It is unisexual.

(d) Its larval form is trochophore.

(e) The nervous system is found in the epidermis.

Which of the above is true for "paddleworm"?

Match the following:

List-I                                                     List-II

(A) Green glands                                  (I) Scolopendra

(B) Amphids and Phasmids                (II) Respiratory organ

(C) Ctenidia                                          (III) Shell protein

(D) Poison claw                                    (IV) Excretory organs

(E) Concholin                                        (V) Sense organs

The correct match is:

Note the following:

An insect whose mouthparts are biting and chewing type in the larval condition, while they are siphoning type in the adult and this insect gives an economically important substance during yet another stage of its development.

The insect is:

Study the following:

A. It is a terrestrial arthropod.

B. The prosoma bears a pair of chelicerae, a pair of the pedipalps and four pairs of walking legs.

C. The metasoma ends in a telson.

D. First pair of walking legs are modified as poisonous claws.

Which of the above are true for Heterometrus?

Study the following is Pheretima:

A. Dorso-intestinal blood-vessels.

B. External intestinal plexus.

C. Internal intestinal plexus.

D. Ventro-intestinal blood vessel.

Arrange the blood vessels in the correct sequence of blood flow from ventral blood vessel to dorsal blood vessel.

The correct sequence is: