🩺 NEET🧬 Biology

Animal Kingdom

4 solved NEET Biology previous year questions on Animal Kingdom, each with the correct answer and a full explanation.

Which of the following statements is without exception for sponges?

aThey all have calcareous spicules

bThey have high regenerative power

cThey are found only in marine water

dThey are all radially symmetrical

✓ Correct answer: b) They have high regenerative power

ExplanationSponges are asymmetrical.They are mostly marine but can also be found in fresh water.Regenerative power of sponges is high.

Which of the following statements is not true?

aSubphyla Urochordata and Cephalochordata are often referred to as protochordates.

bAll chordates are vertebrates but all vertebrates are not chordates.

cIn Urochordata, notochord is present only in larval tail.

dChordata is divided into 3 subphyla: Urochordata or Tunicata, Cephalochordata and Vertebrata

✓ Correct answer: b) All chordates are vertebrates but all vertebrates are not chordates.

Explanation1. Correct → Urochordata and Cephalochordata are called protochordates.2. Incorrect → It should be the other way: All vertebrates are chordates, but all chordates are not vertebrates.3. Correct → In Urochordata, notochord is only in the larval tail.4. Correct → Phylum Chordata has 3 subphyla: Urochordata, Cephalochordata, Vertebrata.

Open Circulatory system is present in : [Re-NEET 2024]

aPalaemon, Nereis, Balanoglossus

bHirudinaria, Bombyx, Salpa

cAnopheles, Limax, Limulus

dPheretima, Musca, Pila

✓ Correct answer: c) Anopheles, Limax, Limulus

ExplanationAn open circulatory system is found in most arthropods, certain mollusks (except cephalopods), and some other invertebrates like Limulus (horseshoe crab).Anopheles: is a mosquito, an arthropod.Limax: is a slug, a mollusk.Limulus: is a horseshoe crab.

Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system

aAves

bReptilia

cAmphibia

dOsteichthyes

✓ Correct answer: a) Aves

ExplanationThe correct answer is Option A: Aves.Birds (Aves) have a specialized digestive system that includes: Crop – A pouch-like enlargement of the esophagus used to store and soften food before digestion.Gizzard – A muscular stomach that grinds food, often with the help of ingested stones, since birds lack teeth.These adaptations help birds efficiently process food to meet their high energy requirements for flight.Reptiles and amphibians have simpler digestive systems without both crop and gizzard.Osteichthyes (bony fishes) also lack these structures.Thus, the presence of both crop and gizzard is a defining feature of birds.

Practice more NEET Biology PYQs

Browse every Biology chapter, or explore the full NEET question bank.

🧬 All Biology chapters →