All the following are present in sponges, except
1. Spicules
2. Choanocytes
3. A digestive tract
4. Sexual and / or asexual reproduction
Find out the correct match from the following table:-
|
Column-I |
Column-II |
Column-III |
(i) |
Radula |
Rasping organ |
Pila |
(ii) |
Hooks and suckers |
Taenia |
Annelida |
(iii) |
Tube feet |
Asterias; Dentalium |
Echinodermata |
(iv) |
Comb plates |
Pleurobrachia; Aurelia |
Ctenophora |
1. (i) only
2. (i) and (ii)
3. (iii) only
4. (ii) and (iii)
Excretory system is absent, sexes are separate,
fertilization is usually external this is correct for :
1. | 2. | ||
3. | 4. |
Select the correct option in respect of characteristics
of each group :-
|
Cyclostomes |
Chondrichthyes |
Osteichthyes |
(i) |
Marine |
Marine, Fresh water |
Marine |
(ii) |
Sucking mouth |
Ventral mouth |
Terminal mouth |
(iii) |
6-15 Pairs of Gills |
5-7 Pairs of Gills |
4 Pairs of Gills |
(iv) |
Placoid scales |
Cycloid Scales |
Ctenoid/ Ganoid |
1. (i), (ii) are correct.
2. (i), (iii), (iv) are correct.
3. (ii), (iii) are correct.
4. (ii), (iii), (iv) are correct.
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
Mark the correct match with the group and its
characteristic?
1. Arthropoda Compound eye and wings.
2. Mammalia Viviparity.
3. Echinodermata Calcareous endoskeleton.
4. Annelida Fresh water and segmented body.
Which of the following chordata is characterised with marine habitat, external fertilization and direct development?
1. Petromyzon.
2. Antedon.
3. Hippocampus.
4. Scolodion.
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