1. Which of the following animals is cold-blooded?
Answer:
Explanation:
Amphibians are ectothermic (cold-blooded) animals.
2. Radial symmetry is characteristic of:
Answer:
Explanation:
Cnidarians, like jellyfish, display radial symmetry.
3. Which group of animals are triploblastic?
Answer:
Explanation:
Platyhelminthes are triploblastic, having three germ layers.
4. Pseudocoelom is present in:
Answer:
Explanation:
Nematodes, like roundworms, have a pseudocoelom.
5. Animals having a notochord are called:
Answer:
Explanation:
Chordates possess a notochord at some stage in their life.
6. The group of animals known for a jointed exoskeleton is:
Answer:
Explanation:
Arthropods are characterized by a jointed exoskeleton.
7. Which of the following animals breathe through spiracles?
Answer:
Explanation:
Insects breathe through tiny openings called spiracles.
8. Cephalopods belong to the phylum:
Answer:
Explanation:
Cephalopods, like octopuses and squids, belong to Mollusca.
9. The most primitive chordates are:
Answer:
Explanation:
Urochordates are considered the most primitive chordates.
10. Which of the following is not a characteristic of echinoderms?
Answer:
Explanation:
Echinoderms don't have jointed appendages; that's a characteristic of arthropods.
11. Which animals have a closed circulatory system?
Answer:
Explanation:
Annelids, like earthworms, have a closed circulatory system.
12. Which among the following is a flightless bird?
Answer:
Explanation:
Ostrich is a flightless bird.
13. The body cavity which is lined by mesoderm on one side and endoderm on the other side is called:
Answer:
Explanation:
Pseudocoelom is the body cavity defined as above.
14. Which animal exhibits metagenesis?
Answer:
Explanation:
Jellyfish undergoes metagenesis, alternating between polyp and medusa stages.
15. Which of the following is a marsupial?
Answer:
Explanation:
Kangaroos are marsupials, bearing young ones in an undeveloped state.
16. Animals that lack body cavity are termed as:
Answer:
Explanation:
Animals without a body cavity are acoelomates.
17. Which phylum is characterized by a porous body?
Answer:
Explanation:
Sponges, belonging to Porifera, have a porous body.
18. The presence of a backbone is a characteristic feature of:
Answer:
Explanation:
Vertebrates have a backbone or vertebral column.
19. Which animal has a segmented body and jointed appendages?
Answer:
Explanation:
Spiders, belonging to Arthropoda, have segmented bodies and jointed appendages.
20. Which of the following animals is viviparous?
Answer:
Explanation:
Some species of sharks give birth to live young ones, making them viviparous.