What is present between ectoderm and endoderm in diploblastic animals?

1. Mesenteron

2. Mesenchyme

3. Mesorchium

4. Mesoglea

When any plane of section passing through the central axis of body, divides the organism into identical halves, it is called

1. Radial symmetry

2. Biradial symmetry

3. Bilateral symmetry

4. Spherical symmetry

Identify the following diagrams and these represent:

1. (a) radial symmetry, (b) bilateral symmetry

2. (a) bilateral symmetry, (b) radial symmetry

3. (a) asymmetrical, (b) radial symmetry

4. (a) bilateral symmetry, (b) asymmetrical

In some Bilateria, the body is of many segments that show serial repetition of parts. Such segments are called as:

1. Myotomes

2. Metameres

3. Proglottides

4. Comb plates

Notochord is derived from embryonic:
1. Ectoderm

2. Mesoderm

3. Endoderm

4.Ectoderm and Mesoderm

Identify the phylum where the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches between ectoderm and endoderm?

A phylum which are multicellular, having Bilateral symmetry and without body cavity is

1.Platyhelminthes

2.Aschelminthes

3.Nemathelminthes

4.Both 2 and 3

Mark the incorrect statement

1. Radial symmetry is advantageous to sedentary mode of life 

2. Notochord is mesodermal in origin placed between dorsal hollow nerve cord and alimentary canal in some animals 

3. Pseudocoel (false coelom) derived from blastocoel of the embryo and is bounded by ectoderm and mesoderm

4. Cephalization is the concentration of sense organs, nervous tissue (brain), and food capturing organs at the anterior end 

A true coelom is between

1. Mesoderm and endoderm

2. Ectoderm and mesoderm

3. Body wall and endoderm

4. Body wall and mesoderm