Which one of the following animal phyla does not possess a coelom?

• Platyhelminthes

• Annelida

• Mollusca

• Echinodermata

The scientific name of the moth which produce tasar is

• Bombyx mori

• Antherae mylitta

• Antherae assamensi

• Philosomia ricini

Muga silk worm feeds on

• Shorea

• Terminalia

• Machilus

• Marus

Which one of the following animal phyla possesses spicule?

• Annelida

• Mollusca

• Porifera

• Platyhelminthes

Fin rot of fish is caused by

• Aeromonas

• Pseudomonas

• Branchiomyces

• Xenopsylla

In most simple type of canal system of Porifera, water flows through which one of the following ways?

• Ostia $\to$ Spongocoel $\to$ Osculum $\to$ Exterior

• Spongocoel $\to$ Ostia $\to$ Osculum $\to$ Exterior

• Osculum $\to$ Spongocoel $\to$ Ostia $\to$ Exterior

• Osculum $\to$ Ostia $\to$ Spongocoel $\to$ Exterior

Select the wrong statement.

• Isogametes are similar in structure, function and behaviour

• Anisogametes differ either in structure, function and behaviour

• In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

• Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy

One of the representative of Phylum - Arthropoda is

• cuttlefish

• silverfish

• pufferfish

• flying fish

199.

The body of Rohu fish is covered by

• cycloid scale, but the tail of homocercal

• placoid scale, but the tail of heterocercal

• cycloid scale, but the tail of heterocerca

• placoid scale, but the tail is homocercal

Which one is an example of living fossil?

• Coral

• Ascidia

• Octopus

• King crab