Buoyancy in a bony fish is maintained with the help of

(1) streamlined body

(2) paired fins

(3) swim bladder

(4) all the above

In which of the following animals the adults have pentamerous radial symmetry while their larvae are bilaterally symmetrical?

(1) Arthropods

(2) Molluscs

(3) Echinoderms

(4) Annelids

Botryoidal tissue is found in

(1) hirudina

(2) polychaeta

(3) oligochaeta

(4) all of these.

Which of the following is an egg laying mammal?

(1) Kangaroo

(2) Platypus

(3) Penguin

(4) Whale

Class Crustacea has following features:

(1) Cephalothorax, book lungs, chitinous exoskeleton

(2) Head and thorax, biramous appendages, book lungs

(3) Head and thorax, book lungs, chitinous exoskeleton

(4) Cephalothorax, biramous appendages, gills

Which of the following is wrongly matched?

(1) Haemoglobin in mammals – RBC

( 2) Haemozoin – Plasmodium cytoplasm

(3) Haemocyanin – leeches

(4) Haemoglobin dissolved in blood – Pheretima

Which of the following is correct about nematocyst?

(1) It can be re-used.

(2) It is excretory organ in arthropods

(3) It is ejected on contact and pierce the prey

(4) None of these

Ambulacral grooves are absent in the living forms of the Class

(1) Crinoidea

(2) Asteroidea

(3) Ophiuroidea

(4) Echinodermata

Which of the following Phyla are included in Enterozoa?

(1) Annelida, Mollusca, Porifera

(2) Echinodermata, Hemichordata, Porifera

(3) Mollusca, Arthropoda, Hemichordata

(4) Porifera, Mollusca, Arthropoda

Hydra receives impulses and stimuli through

(1) nerve net

(2) nematocytes

(3) sensory cells

(4) flame cells