Annelids do not represent:-

1.  Circumpharyngeal nerve ring

2.  Longitudinal muscles in the gut

3.  Metameric segmentation

4.  Mesodermal pouches in body cavity

From the given statements which of the following
statement(s) is/are incorrect for Annelida?
a. Pseudometameric segmentation present
b. Coelomic fluid acts as a hydrostatic skeleton
c. They possess longitudinal and circular muscles
which help in locomotion
d. Neural system consists of paired ganglia connected
by lateral nerves to a single ventral nerve chord

1. a & b only

2. b & c only

3. a only

4. a & d only

Which of the following phyla is not correctly matched
to its general characters?

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

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

What is true about Nereis, scorpion, cockroach and silver fish ? 
1. They all possess dorsal heart
2. None of them is aquatic
3. They all belong to the same phylum
4. They all have jointed paired appendages

All triploblastic animals primarily possess

1. Bilateral symmetry

2. True coelom

3. Unisexuality with sexual dimorphism

4. Regeneration power

Which of the following statement is incorrect with respect to vertebrates?
1. Vertebrates possess notochord during the embryonic period
2. Notochord is replaced by a cartilaginous or bony vertebral column in the adult
3. All vertebrates are chordates but all chordates are not vertebrates
4. Vertebrates have a dorsal muscular heart with two, three, or four chambers

The most distinctive feature of echinoderms is the presence of a water vascular system which helps in
(A) Locomotion
(B) Excretion
(C) Respiration
(D) Reproduction

1. (A) only
2. (B) & (C) only
3. (A), (B) & (C) only
4. (A), (B), (C) & (D)