Select the taxon mentioned that represents both marine and freshwater species

(1) Echinoderms

(2) Ctenophora

(3) Cephalochordata

(4) Cnidaria

Which one of the following living organisms completely lacks a cell wall?

(1) Cyanobacteria

(2) Sea-fan (Gorgonia)

(3) Saccharomyces

(4) Blue-green algae

Which of the following pairs are correctly matched?

(1) A, C and D

(2) B, C and D

(3) Only A and D

(4) Only A and B

Metagenesis refers to

1. the presence of different morphic forms

2. alternation of generation between asexual and sexual phases of an organism

3. occurance of a drastic change in form during post embryonic development

4. the presence of a segmented body and parthenogenetic mode of reproduction

Polyp phase is absent in the life cycle of:

(1) Hydra

(2) Hormiphora

(3) Pennatula

(4) Physalia

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

Hydra receives impulses and stimuli through

(1) nerve net

(2) nematocytes

(3) sensory cells

(4) flame cells

Based on cellular mechanisms there are two major types of regeneration found in the animals. Which one of the following is the correct example of the type mentioned?

(1) Morphallaxis - Regeneration of two transversel cut equal pieces of a Hydra into two small Hydras

(2) Epimorphosis - Replacement of old and dead erythrocytes by the new ones

(3) Morphallaxis - healing up of a wound in the skin

(4) Epimorphosis - Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians

Stinging capsules (nematocysts) are found in

(1) wasp and honeybee

(2) scorpion and cobra

(3) sea pen and sea fan

(4) cactus and Venus flytrap

The digestive system in Meandrina is

(1) Digestion is extracellular only

(2) Digestion is intracellular only

(3) Digestion is both extracellular and intracellular

(4) Digestion absent as it is a parasite