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179 questions with worked solutions.
Q1. The only ctenophoran to bear cnidoblasts is
Answer: Bolinopsis
Bolinopsis is the ctenophoran noted for bearing cnidoblasts, a rare feature among ctenophores. The others listed do not characteristically possess these stinging cells.
Q2. The blind sac body plan is applicable to members of .......... of kingdom Animalia
Answer: Cnidaria and Platyhelminthes
A blind sac body plan means the digestive system has a single opening, so food enters and wastes leave through the same opening. Cnidaria and Platyhelminthes fit this pattern because they do not have a complete through-gut.
Q3. Deuterostomial coelomates are
Answer: Chordates
Chordates are deuterostomes, meaning during embryonic development the blastopore typically forms the anus first. Mollusks, arthropods, and annelids are protostomes, not deuterostomes.
Answer: Hemichordata
The stomochord is a buccal diverticulum found in hemichordates, especially in the collar region. It resembles a notochord but is not homologous to it, so the correct choice is Hemichordata.
Q5. Which one of the following animals has a nervous system but no brain?
Answer: Hydra
Hydra is a cnidarian and has a diffuse nerve net, so it can respond to stimuli without a true brain. Earthworm and cockroach have more centralized nervous systems, while Amoeba has no nervous system at all.
Q6. Primata and Carnivora are placed together in the same?
Answer: Order
Primata and Carnivora are both orders within the class Mammalia. An order is the taxonomic rank used to group related families, so the correct choice is Order.
Q7. Nitrogenous waste in the Malpighian tubule flows into
Answer: Haemocoel
In insects, Malpighian tubules collect nitrogenous wastes from the haemolymph and release them into the haemocoel. From there, the wastes are passed into the gut for elimination.
Q8. Ornithorhynchus is an example of
Answer: Monotreme mammal
Ornithorhynchus is the genus of the platypus, which is an egg-laying mammal. Egg-laying mammals are monotremes, so it is a monotreme mammal rather than a marsupial or eutherian.
Q9. Which of the following segments has photoreceptors in cockroach?
Answer: Head
Cockroaches detect light using eyes and ocelli, which are located on the head. The thorax and abdomen do not bear photoreceptors.
Q10. In which phylum, the coelom is formed by fusion of gut pouches during embryonic stage?
Answer: Hemichordata
In Hemichordata, the coelom develops by enterocoely, where pouches from the embryonic gut fuse and separate to form the body cavity. This is the defining coelom-formation pattern among the options.
Q11. Which of the following represents the correct combination without any exception?
Answer: Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord - Chondrichthyes
Chondrichthyes are cartilaginous fishes with a ventral mouth, gills not covered by an operculum, placoid scales, and a persistent notochord. The other options mix traits from different classes, so they are not fully correct combinations.
Q12. Acute vision is present in
Answer: vulture
Vultures have very sharp vision, which helps them locate food from high in the sky. The other animals listed do not have vision as acute as a vulture's.
Q13. Which one of the following pairs is mismatched?
Answer: Pila globosa - pearl
Pila globosa is a freshwater snail, and snails do not produce pearls as a commercial product. Honey, lac, and silk are correctly matched with Apis indica, Kenia lacca, and Bombyx mori respectively.
Q14. Which of the following animals are true coelomates with bilateral symmetry?
Answer: Annelids
Annelids are true coelomates because they have a body cavity fully lined by mesoderm, and they are bilaterally symmetrical. Adult echinoderms are radially symmetrical, Aschelminthes are pseudocoelomates, and Platyhelminthes are acoelomates.
Q15. Which of the following characteristics is mainly responsible for diversification of insects on land?
Answer: Exoskeleton
The exoskeleton is crucial for insects living on land because it provides a tough protective covering and helps reduce water loss. These advantages made it easier for insects to survive and diversify in terrestrial habitats.
Q16. Bilaterally symmetrical and acoelomate animals are exemplified by
Answer: Platyhelminthes
Platyhelminthes are flatworms, which are bilaterally symmetrical and acoelomate. The other options do not fit both traits together: Aschelminthes are pseudocoelomate, Annelida are coelomate, and Ctenophora are not acoelomate bilaterally symmetrical animals.
Answer: Alteration of generation between asexual and sexual phases of an organism
Metagenesis means alternation of generations, where an organism alternates between asexual and sexual phases. This is different from metamorphosis, which is a change in body form during development.
Answer: Annelida, Arthropoda and Chordata
Annelids, arthropods, and chordates all have organ-system level organization, bilateral symmetry, and a true coelom. They also show segmentation of the body, unlike molluscs, which are not segmented.
Q19. Radial symmetry is usually associated with
Answer: sedentary mode of life
Radial symmetry is common in organisms that are attached or largely immobile, because they receive stimuli from all directions equally. This fits a sedentary lifestyle better than active directional movement.
Q20. The organisms attached to the substratum, generally, possess
Answer: radial symmetry
Organisms attached to a substratum are generally sessile, so they benefit from radial symmetry because it lets them respond to stimuli and capture food from all directions. This is common in forms like cnidarians and adult echinoderms.