Which of the following animals have scattered cells with cell–tissue grade organization:

1. Sponge

2. Hydra

3. Liver fluke

4. Ascaris

Given below are four matchings of an animal and its kind of respiratory organ:
 

The correct matchings are:

1. A and D

2. A, B, and C

3. B and D

4. C and D

Which one of the following is a matching pair of an animal and a certain phenomenon it exhibits:

1. Pheretima – Sexual dimorphism

2. Musca – Complete metamorphosis

3. Chameleon – Mimicry

4. Taenia – Polymorphism

During its life cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stage respectively:

1. Redia and miracidium

2. Cercaria and redia

3. Metacercaria and cercaria

4. Miracidium and metacercaria

Sycon belongs to a group of animals, which are best described as:
 

In Hydra, waste material of food digestion and nitrogenous waste material are removed from:
1.  Mouth and mouth
2.  Body wall and body wall
3.  Mouth and body wall
4.  Mouth and tentacles

In which of the following animal post-anal tail is found:
1.  Earthworm
2.  Lower invertebrate
3.  Scorpion
4.  Snake

In which of the following haemocyanin pigment is found:
1.  Annelida
2.  Echinodermata
3.  Insecta
4.  Lower Chordata

In which animal nerve cell is present but the brain is absent:

1. Sponge

2. Earthworm

3. Cockroach

4. Hydra

In which of the following, the notochord is present in the embryonic stage?