What is the most important reason for the immense success of arthropods?
1. Chitinous exoskeleton
2. Uricotelic nature
3. Compound eye
4. Multipurpose appendages
What is not true for a generalized mollusc?
1. Body segmented into head, visceral mass and foot.
2. A rasping tongue like organ – radula present.
3. Mantle cavity with gills
4. Excretory structures – nephridia
How many of the characters given below are true for echinoderms?
I. An endoskeleton of calcareous ossicles
II. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical.
III. They are triploblastic and coelomate animals.
IV. Digestive system is complete.
V. Water vascular system
VI. Sexual reproduction, internal fertilization and direct development.
Which of the following is not seen in hemichordates?
1. A tripartite body organization
3. Rudimentary notochord
4. Proboscis gland
Consider the following features:
I. Ampulla of Lorenzini
II. Operculum or gill cover
V. Swim bladder
VI. Lateral line system
The features that can be attributed to cartilaginous fishes are:
1. I, III and IV only
2. II, V and VI only
3. I, II, III and IV
Key features that appeared for the first time in amphibians do not include:
2. Nutritional deficiencies
4. Pulmonary veins
Consider the following characters:
I. Wish bone furculum
II. Pneumatic bones
V. Left aortic arch
VI. Four chambered heart
Which of these are unique to birds?
1. I, II and III only
2. I, II, III and IV only
3. I, II, III, IV and V only
Identify the incorrectly matched pair
Largest land mammal
Match each item in Column I with one item in Column II and chose your answer from the codes given below:
(a) Lateral line system
(b) Water vascular system
(d) Comb plates
(a) (b) (c) (d) (e)
1. (i) (ii) (iii) (iv) (v)
2. (iv) (iii) (ii) (i) (v)
3. (v) (iii) (i) (iv) (ii)
4. (iii) (ii) (i) (v) (iv)
Reptiles were very successful on land while amphibians were not. What evolutionary development was primarily responsible for the success of reptiles on land?
1. Scales over skin
2. Thoracic breathing
3. Amniotic egg
4. Strong Jaws