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)

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

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

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

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 chordata is characterised with marine habitat, external fertilization and direct development?

1. Petromyzon.

2. Antedon.

3. Hippocampus.

4. Scolodion.

Mark the correct match with the group and its
characteristic?
1. Arthropoda $\to$ Compound eye and wings.
2. Mammalia $\to$ Viviparity.
3. Echinodermata $\to$ Calcareous endoskeleton.
4. Annelida $\to$ Fresh water and segmented body.

Annelids do not represent:-

1.  Circumpharyngeal nerve ring

2.  Longitudinal muscles in the gut

3.  Metameric segmentation

4.  Mesodermal pouches in body cavity

Read the following statements :

A. Mouth is located ventrally.
B. Notochord is persistent throughout life.
C. Gill slits are seperate and with operculum.
D. Air bladder are absent.

How many of the above statements are correct for given
figure :

1. Four.
2. Three.
3. Two.
4. One

Select the correct option in respect of characteristics
of each group :-

1. (i), (ii) are correct.
2. (i), (iii), (iv) are correct.
3. (ii), (iii) are correct.
4. (ii), (iii), (iv) are correct.