Which one feature is common to leech, cockroach and scorpion

• Nephridia

• Cephalisation

• Ventral nerve cord

• Antenna

Assertion : The duck-billed Platypus and the spiny ant-eater, both are egg-laying animals yet they are grouped under mammals.

Reason : Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.

• If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false

Tube-within-a-tube body plan is shown by

• coelenterates

• platyhelminthes

• aschelminthes (nemathelminthes)

• porifers

True coelom appeared first in the course of evolution in

• Aschelminthes

• Chordata

• Echinodermata

• Annelida

165.

Shifting of ammonotelism to ureotelism is seen in

• fishes

• protopterus

• frog

• snake

Which of the following is not found in vertebrates

• Bilateral symmetry

• Gill opening

• Body scales

• Cnidoblasts

Which of the following is a viral disease in silkworm ?

• Flacherie

• Grasserie

• Muscardine

• Pebrine

Which of the following is not the example of marine fishes ?

• Labeo

• Mugil

• Hilsa

• Sardines

Which artery is absent in frog

• Right systemic arch

• Phrenic artery

• Carotid artery

• Renal artery

Blind sac body plan is shown by

• roundworms

• annelids

• coelenterates

• arthropods