Animal Kingdom – Daily Practice Problem (DPP)

Q1. Which of the following is a characteristic feature of sponges (Porifera)?

1. Tissue level of organization
2. Presence of ostia
3. Extracellular digestion
4. Indirect development without larval stage

✅ View Answer & Explanation

Correct Answer: (2) Presence of ostia
Explanation: Sponges have a water transport system where water enters through minute pores (ostia) in the body wall. They have cellular level organization and intracellular digestion.

Q2. Cnidoblasts are used for:

1. Anchorage
2. Defense
3. Capture of prey
4. All of the above

✅ View Answer & Explanation

Correct Answer: (4) All of the above
Explanation: Cnidoblasts (or cnidocytes) contain stinging capsules (nematocysts) and are used for anchorage, defense, and capturing prey.

Q3. Metagenesis refers to:

1. Alteration of generation between asexual and sexual phases of an organism
2. Occurrence of a drastic change in form during post-embryonic development
3. Presence of a segmented body and parthenogenetic mode of reproduction
4. Presence of different morphic forms

✅ View Answer & Explanation

Correct Answer: (1) Alteration of generation between asexual and sexual phases
Explanation: In Cnidarians like Obelia, polyps produce medusae asexually and medusae form the polyps sexually (Metagenesis).

Q4. Which of the following animals does not undergo metamorphosis?

1. Earthworm
2. Tunicate
3. Moth
4. Starfish

✅ View Answer & Explanation

Correct Answer: (1) Earthworm
Explanation: Earthworm development is direct; there is no larval stage and hence no metamorphosis.

Q5. Which one of the following kinds of animals are triploblastic?

1. Flatworms
2. Sponges
3. Ctenophores
4. Corals

✅ View Answer & Explanation

Correct Answer: (1) Flatworms
Explanation: Platyhelminthes (Flatworms) are the first phylum to exhibit triploblastic organization (ectoderm, mesoderm, endoderm).

Q6. Flame cells are the excretory structures for:

1. Annelida
2. Coelenterata
3. Platyhelminthes
4. Echinodermata

✅ View Answer & Explanation

Correct Answer: (3) Platyhelminthes
Explanation: Specialized cells called flame cells help in osmoregulation and excretion in flatworms.

Q7. Bilaterally symmetrical and acoelomate animals are exemplified by:

1. Ctenophora
2. Platyhelminthes
3. Aschelminthes
4. Annelida

✅ View Answer & Explanation

Correct Answer: (2) Platyhelminthes
Explanation: Platyhelminthes are bilaterally symmetrical, triploblastic, and acoelomate.

Q8. Which group of animals belongs to the same phylum?

1. Earthworm, Pinworm, Tapeworm
2. Prawn, Scorpion, Locusta
3. Sponge, Sea anemone, Starfish
4. Malarial parasite, Amoeba, Mosquito

✅ View Answer & Explanation

Correct Answer: (2) Prawn, Scorpion, Locusta
Explanation: All three belong to the phylum Arthropoda. (Option 1: Annelida, Aschelminthes, Platyhelminthes; Option 3: Porifera, Cnidaria, Echinodermata).

Q9. A file-like rasping organ for feeding, called radula, is present in the phylum:

1. Arthropoda
2. Mollusca
3. Echinodermata
4. Chordata

✅ View Answer & Explanation

Correct Answer: (2) Mollusca
Explanation: Radula is a characteristic feature of Molluscs (except bivalves) used for feeding.

Q10. Water vascular system is the characteristic of which group of the following:

1. Porifera
2. Ctenophora
3. Echinodermata
4. Chordata

✅ View Answer & Explanation

Correct Answer: (3) Echinodermata
Explanation: The water vascular system (ambulacral system) helps in locomotion, capture/transport of food, and respiration. (Porifera has a water *canal* system).

Q11. Which one of the following is a matching set of a phylum and its three examples?

1. Porifera: Spongilla, Euplectella, Pennatula
2. Cnidaria: Bonellia, Physalia, Aurelia
3. Platyhelminthes: Planaria, Schistosoma, Enterobius
4. Mollusca: Loligo, Teredo, Octopus

✅ View Answer & Explanation

Correct Answer: (4) Mollusca: Loligo, Teredo, Octopus
Explanation: In option 1, Pennatula is a Cnidarian. In option 3, Enterobius is an Aschelminthes. Option 4 correctly lists molluscs.

Q12. Which of the following features is not present in the Phylum Arthropoda?

1. Parapodia
2. Jointed appendages
3. Chitinous exoskeleton
4. Metameric segmentation

✅ View Answer & Explanation

Correct Answer: (1) Parapodia
Explanation: Parapodia are lateral appendages used for swimming in aquatic Annelids like Nereis.

Q13. In which of the following, the notochord is present in the embryonic stage and replaced by a vertebral column in the adult?

1. Protochordates
2. Vertebrates
3. Cephalochordates
4. Hemichordates

✅ View Answer & Explanation

Correct Answer: (2) Vertebrates
Explanation: “All vertebrates are chordates but all chordates are not vertebrates.” Vertebrates have a vertebral column.

Q14. A marine cartilaginous fish that can produce electric current is:

1. Pristis
2. Torpedo
3. Trygon
4. Scoliodon

✅ View Answer & Explanation

Correct Answer: (2) Torpedo
Explanation: Torpedo (Electric ray) has electric organs. Trygon (Sting ray) has a poison sting.

Q15. Which of the following characteristic features always holds true for the corresponding group of animals?

1. Viviparous – Mammalia
2. Possess a mouth with an upper and a lower jaw – Chordata
3. 3-chambered heart with one incompletely divided ventricle – Reptilia
4. Cartilaginous endoskeleton – Chondrichthyes

✅ View Answer & Explanation

Correct Answer: (4) Cartilaginous endoskeleton – Chondrichthyes
Explanation: Ornithorhynchus (Platypus) is an oviparous mammal. Crocodiles have a 4-chambered heart. Agnatha lack jaws.

Q16. Which of the following is not a homeotherm?

1. Camelus
2. Chelone
3. Macaca
4. Psittacula

✅ View Answer & Explanation

Correct Answer: (2) Chelone
Explanation: Chelone (Turtle) is a reptile and is poikilothermic (cold-blooded). Birds (Psittacula) and Mammals (Camelus, Macaca) are homeotherms.

Q17. Which of the following features is not present in Periplaneta americana?

1. Exoskeleton composed of N-acetylglucosamine
2. Metamerically segmented body
3. Schizocoelom as body cavity
4. Indeterminate and radial cleavage during embryonic development

✅ View Answer & Explanation

Correct Answer: (4) Indeterminate and radial cleavage
Explanation: Arthropods show determinate and spiral cleavage. Radial/Indeterminate cleavage is a feature of Deuterostomes (Echinoderms/Chordates).

Q18. Pneumatic bones are expected to be found in:

1. Pigeon
2. House lizard
3. Frog
4. Flying fish

✅ View Answer & Explanation

Correct Answer: (1) Pigeon
Explanation: Pneumatic (hollow) bones are a flight adaptation in Aves (Birds).

Q19. Which of the following represents the correct combination without any exception?

1. Sucking and circular mouth; jaws absent, integument without scales; paired appendages – Cyclostomata
2. Body covered with feathers; skin moist and glandular; forelimbs form wings; lungs with air sacs – Aves
3. Mammary gland; hair on body; pinnae; two pairs of limbs – Mammalia
4. Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord – Chondrichthyes

✅ View Answer & Explanation

Correct Answer: (4) Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord – Chondrichthyes
Explanation: Cyclostomes lack paired appendages. Birds have dry skin (except oil gland). Cetaceans (whales) lack hair/pinnae.

Q20. An animal having diploblastic organization, radial symmetry and a single opening for ingestion and egestion involves:

1. Fasciola
2. Asterias
3. Hydra
4. Pila

✅ View Answer & Explanation

Correct Answer: (3) Hydra
Explanation: Hydra (Cnidaria) is diploblastic, radially symmetrical, and has a blind-sac body plan (single opening).

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