11
MCQ (Single Correct Answer)
Match the following list of animals with their level of organisation.
| Division of Labour | Animal | ||
|---|---|---|---|
| (i) | Organ level | A. | Pheretima |
| (ii) | Cellular aggregate level | B. | Fasciola |
| (iii) | Tissue level | C. | Spongilla |
| (iv) | Organ system level | D. | Obelia |
Choose the correct match showing division of labour with animal example.
A
(i)-B, (ii)-C, (iii)-D and (iv)-A
B
(i)-B, (ii)-D, (iii)-C and (iv)-A
C
(i)-D, (ii)-A, (iii)-B and (iv)-C
D
(i)-A, (ii)-D, (iii)-C and (v)-B
12
MCQ (Single Correct Answer)
Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called.
A
Acoelomate
B
Pseudocoelomate
C
Coelomate
D
Haemocoelomate
13
MCQ (Single Correct Answer)
Match the column I with column II and choose the correct option.
| Division of Labour | Animal | ||
|---|---|---|---|
| A. | Porifera | 1. | Canal system |
| B. | Aschelminthes | 2. | Water vascular system |
| C. | Annelida | 3. | Muscular Pharynx |
| D. | Arthropoda | 4. | Jointed appendages |
| E. | Echinodermata | 5. | Metameres |
A
A-2, B-3, C-5, D-4, E-1
B
A-2, B-5, C-3, D-4, E-1
C
A-1, B-3, C-5, D-4, E-2
D
A-1, B-5, C-3, D-4, E-2
14
Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.
Explanation
Symmetry is an attribute of an organism showing regularity in body parts on a plane or around an axis.
In Phylum Echinodermata, the adult echinoderms are radially symmetrical but the larvae are bilaterally symmetrical.
15
What is the importance of pneumatic bones and air sacs in Aves?
Explanation
Birds possess light weight bones that contain internal spaces filled with air. These are called pneumatic bones. They help in, reducing their body weight, thus is an adaptation for flight.
Aerodynamic lungs with specialised air sacs provides an additional feature and gives adaptability to birds to fly (e.g., bald eagle, pigeon).