Which one of the following is the infective stage of Ascaris lumbricoides?

• Unsegmented egg

• Egg with first stage larva

• Egg with second stage larva

• Free third stage larva

Green gland is the excretory organ of

• prawn

• butterfly

• snail

• earthworm

The typhlosole in earthworm is related with

• excretion

• absorption

• respiration

• reproduction

Name two internal characteristic features of class-Mammalia

Water vascular system is present in which of the following phylum?

• Porifera

• Cnidaria

• Ctenophora

• Echinodermata

In which triploblastic animal, coelom is absent?

• Platyhelminthes

• Aschelminthes

• Annelids

• Arthropoda

Mesoglia is seen in between

• ectoderm and endoderm

• ectoderm and mesoderm

• mesoderm and endoderm

• just below mesoderm

The parasite, which completes its life cycle in a single host is

• Fasciola hepatica

• Plasmodium vivax

• Taenia solium

• Ascaris lumbricoides

In which of the following phyla, compound eyes are present?

• Annelida

• Arthropoda

• Mollusca

• Echinodermata

State the advantages of composite fish culture.