ANIMAL KINGDOM
In the following questions, a statement of assertion (A) is followed by a statement of reason (R).
(1) If both Assertion & Reason are true and the Reason is the correct explanation of the Assertion then mark (1)
(2) If both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion then mark (2)
(3) If Assertion is true statement but Reason is false, then mark (3)
(4) If both Assertion and Reason are false statements, then mark (4)
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2.A:- Platyhelminthes are commonly called flat worms.
R:- They have dorso- ventrally flattened
2. A:- Body of roundworms is circular in cross-section.
R:- Their coelom is incompletely lined by mesoglea.
3. A:- In open type circulatory system, cells and tissues directly bathe in blood.
R:- In open type circulatory system, blood flows through sinuses and capillaries are absent.
4. A:- Platyhelminthes have two openings to the outside of body that serve as mouth and anus respectively.
R:- A complete digestive system has two openings usually acts as anus.
5. A:- Adamsia exhibit polyp form.
R:- In Obelia, polyp form produces medusae asexually and medusae produces polyp sexually.
6. A:- Echinoderms are also known as spiny bodied animals.
R:- Spiny appearance of echinoderms is due to their exoskeleton of calcareous ossiclles.
7. A:- Body of annelids is divided into segments both internally and externally.
R:- Each individual segment of the body is known as a metamere.
8. A:- Most distinctive feature of echinoderms is the presence of water vascular system
R:- This system does not help in locomotion, respiration, capture and transport of food.
9. A:- Earthworm and tapeworm both exhibit true metamerism.
R:- Body of earthworm and tapeworm is divided into numerous segments since their embryonic life.
10. A:- Pristis will sink if it stops swimming but Catla will not.
R:- Pristis lacks swim bladder while Catla possesses swim bladder.
11. A:- Mixing of oxygenarated and deoxygenarated blood does not occur in heart of fishes.
R:- Fishes have four chambered heart.
12. A:- Tunicates, notochord is present only in larval tail.
R:- Notochord is replaced by bony vertebral column in adult tunicates.
13. A:- All vertebrates are chordates, but all chordates are not vertebrates.
R:- In some chordates, notochord is not replaced by vertebral column.
14. A:- In cephalochordates, notochord is present in head region only.
R:- Vertebral column is persistent throughout the life of cephalochordates.
15. A:- All vertebrates possess notochord during embryonic period only.
R:- In all adult vertebrates, notochord is replaced by bony vertebral column.
16. A:- Cartilaginous fishes have to swim constantly to avoid sinking.
R:- These fishes lack swim bladder which regulates buoyancy.
17. A:- Members of class Aves exhibit numerous aerial adaptations.
R:- These adaptations are aimed at reducing their body weight enabling flight.
18. A:- Mammals are characterised by presence of mammary glands.
R:- All mammal possess functional milk secreting glands that help in nourishing young ones.
19. A:- Locust is a gregarious pest.
R:- Locust belongs to phylum Insecta of class Arthropoda.
20. A:- Body of mollusc is segmented with a distinct head, muscular foot and visceral hump.
R:- Shell is secreted by visceral hump over the mantle.
21. A:- Roundworms exhibits true segmentation.
R:- Segments of roundworms are of embryonic origin.
22. A:- Trygon is a poikilothermic animals.
R:- Body temperature of Trygon changes with change in ambient temperature as they lack capacity to regulate their body temperature.
ANSWER
1.(1) 2. (3) 3. (1) 4. (4) 5. (2) 6. (3) 7. (2)
8. (3) 9. (4) 10 (1) 11. (3) 12. (3) 13. (1) 14. (4)
15. (4) 16. (1) 17. (1) 18. (3) 19. (3) 20. (4) 21. (4) 22. (1)
QUOTE:-“FEARS DRAG US DOWN AND STOP US FROM PERFORMING TO OUR PEAK ABILITY”
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