NEET Biology Animal Kingdom MCQs Set 15

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Multiple Choice Questions

Question 1: Most lower aquatic animals such as protozoans, sponges and coelenterates are ammonotelic because:
(a) Water available to them has little nitrogen
(b) Ammonia can be converted into urea
(c) Excretion of ammonia requires a large amount of water, which is available to them
(d) Ammonia helps check the inflow of water
Show Answer & Explanation

Answer: (c) Excretion of ammonia requires a large amount of water, which is available to them

Explanation:
1. Ammonia is highly toxic and needs a lot of water for its removal, which aquatic animals have.

Teacher's Note:
1. Terrestrial animals excrete urea or uric acid.

Question 2: Which statements about mammals are correct? 1. Delphinus and Balaenoptera are aquatic mammals. 2. Ornithorhynchus is oviparous. 3. Mammals have double occipital condyles.
(a) 1, 2 and 3
(b) 1 alone
(c) 1 and 2 only
(d) 2 and 3 only
Show Answer & Explanation

Answer: (a) 1, 2 and 3

Explanation:
1. Dolphins and whales are aquatic mammals, the platypus lays eggs, and mammals are dicondylic.

Teacher's Note:
1. Platypus is a prototherian mammal.

Question 3: Which endoparasite absorbs nutrients from the host directly through its body surface?
(a) Fasciola
(b) Ascaris
(c) Taenia
(d) All of the above
Show Answer & Explanation

Answer: (c) Taenia

Explanation:
1. Taenia has no digestive tract and absorbs nutrients through its body surface.

Teacher's Note:
1. Tapeworms lack a mouth.

Question 4: Reptiles, birds and mammals resemble in their:
(a) Occipital condyle
(b) Homeothermy
(c) Poikilothermy
(d) Amnion
Show Answer & Explanation

Answer: (d) Amnion

Explanation:
1. All three groups are amniotes with an amnion in the embryo.

Teacher's Note:
1. Reptiles are poikilotherms and the others homeotherms.

Question 5: The symmetry of coelenterates is similar to that of:
(a) Larvae of a phylum with a canal system
(b) Larvae and adults of a phylum with a water vascular system
(c) Adults of a phylum with spiny body wall and dermal calcareous ossicles
(d) All of the above
Show Answer & Explanation

Answer: (c) Adults of a phylum with spiny body wall and dermal calcareous ossicles

Explanation:
1. Coelenterates are radial, as are adult echinoderms, which have spines and calcareous ossicles
2. Echinoderm larvae are bilateral.

Teacher's Note:
1. Adult echinoderms are pentamerous radial.

Question 6: Echinoderms are considered the most evolved invertebrates because they:
(a) Are triploblastic with organ system level organisation
(b) Have great powers of regeneration
(c) Both 1 and 2
(d) Are enterocoelic and deuterostomic
Show Answer & Explanation

Answer: (d) Are enterocoelic and deuterostomic

Explanation:
1. Echinoderms are enterocoelic deuterostomes, like chordates, which marks their advanced position.

Teacher's Note:
1. Deuterostomes include echinoderms, hemichordates and chordates.

Question 7: Which invertebrate is bilaterally symmetrical, has a blind sac body plan, and is triploblastic and acoelomate?
(a) Ascaris
(b) Wuchereria
(c) Hydra
(d) Fasciola
Show Answer & Explanation

Answer: (d) Fasciola

Explanation:
1. Fasciola is a flatworm with an incomplete gut
2. Roundworms have a complete gut and Hydra is diploblastic.

Teacher's Note:
1. Flatworms are acoelomate.

Question 8: Which statement about scorpions is correct?
(a) The body consists of head, thorax and abdomen
(b) They have mosaic and stereoscopic vision
(c) Their book lungs correspond to the gills of a prawn
(d) All of the above
Show Answer & Explanation

Answer: (c) Their book lungs correspond to the gills of a prawn

Explanation:
1. Scorpion book lungs are respiratory organs that correspond to gills of aquatic arthropods like prawns.

Teacher's Note:
1. Their body has a cephalothorax and abdomen.

Question 9: Which are characteristics of Coelenterata? A. diploblastic body B. cnidocytes C. both intracellular and extracellular digestion
(a) A and B
(b) B and C
(c) A and C
(d) A, B and C
Show Answer & Explanation

Answer: (d) A, B and C

Explanation:
1. Cnidarians are diploblastic with stinging cnidocytes and digest food both outside and inside cells.

Teacher's Note:
1. Cnidoblasts are used for defence and capture.

Question 10: Match animal and type of coelom. A. Echinodermata B. Arthropoda C. Aschelminthes D. Annelida; (i) absent (ii) haemocoel (iii) enterocoelous (iv) pseudocoelom (v) schizocoelous
(a) A-iii, B-i, C-v, D-iv
(b) A-iii, B-ii, C-v, D-iv
(c) A-iii, B-ii, C-iv, D-v
(d) A-ii, B-i, C-iii, D-v
Show Answer & Explanation

Answer: (c) A-iii, B-ii, C-iv, D-v

Explanation:
1. Echinoderms have an enterocoelous coelom, arthropods a haemocoel, roundworms a pseudocoelom and annelids a schizocoelous coelom.

Teacher's Note:
1. Learn coelom type for each phylum.

Question 11: In which protochordate does the notochord extend from head to tail in the adult?
(a) Ascidia
(b) Salpa
(c) Doliolum
(d) Branchiostoma
Show Answer & Explanation

Answer: (d) Branchiostoma

Explanation:
1. Cephalochordates keep a notochord from head to tail throughout life
2. In urochordates it is only in the tail of the larva.

Teacher's Note:
1. Cephalochordata is named for the head-long notochord.

Question 12: Which features first evolved in phylum Annelida? 1. metameric segmentation 2. organ system level 3. closed circulatory system 4. true coelom 5. bilateral symmetry
(a) 1, 2 and 5
(b) 1, 2, 3 and 4
(c) 1, 3 and 4
(d) Only 1 and 2
Show Answer & Explanation

Answer: (c) 1, 3 and 4

Explanation:
1. Annelids are the first animals with metamerism, a true coelom and closed circulation
2. Organ systems and bilateral symmetry appeared earlier.

Teacher's Note:
1. Aschelminthes have a pseudocoelom.

Question 13: Select the correctly matched bony fish with its common name:
(a) Betta : fighting fish
(b) Clarias : magur
(c) Pterophyllum : angel fish
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. All three are correct matches.

Teacher's Note:
1. Bony fishes include marine and freshwater species.

Question 14: Select the INCORRECTLY matched animal and common name:
(a) Ophiura : brittle star
(b) Ancylostoma : hookworm
(c) Aptenodytes : penguin
(d) Meandrina : stag-horn coral
Show Answer & Explanation

Answer: (d) Meandrina : stag-horn coral

Explanation:
1. Meandrina is the brain coral.

Teacher's Note:
1. Gorgonia is the sea fan.

Question 15: Exocoetus, Bufo and Labeo on one hand, and Elephas, Psittacula and Columba on the other, differ in:
(a) Body temperature varying with environment in the former and constant in the latter
(b) Mesonephric kidney in the former and metanephric in the latter
(c) Both 1 and 2
(d) Former oviparous, latter viviparous
Show Answer & Explanation

Answer: (c) Both 1 and 2

Explanation:
1. The first group are poikilotherms with mesonephric kidneys, the second homeotherms with metanephric kidneys
2. Birds are oviparous.

Teacher's Note:
1. Amphibians and fishes have mesonephric kidneys.

Question 16: Over two-thirds of named species are arthropods. Which category is NOT matching?
(a) Living fossil : king crab
(b) Vector : Culex
(c) Gregarious pest : Limulus
(d) Economically important : Apis
Show Answer & Explanation

Answer: (c) Gregarious pest : Limulus

Explanation:
1. The gregarious pest is the locust
2. Limulus is the living fossil.

Teacher's Note:
1. Locusts swarm.

Question 17: Identify the correct statement: A. Fertilisation is internal in Ascaris. B. Parapodia help in swimming in a few arthropods. C. Nereis is aquatic and monoecious. D. Radula is a rasping organ of starfish.
(a) A and C
(b) B and C
(c) D only
(d) A only
Show Answer & Explanation

Answer: (d) A only

Explanation:
1. Only A is true
2. Parapodia belong to Nereis (annelid), Nereis is dioecious, and radula belongs to molluscs.

Teacher's Note:
1. Remember which organ belongs to which phylum.

Question 18: Identify the INCORRECT statement about Coelenterata:
(a) Sea anemone is a polyp
(b) Jellyfish is a free-swimming coelenterate
(c) Meandrina exhibits both polyp and medusa forms
(d) Digestion is both extracellular and intracellular
Show Answer & Explanation

Answer: (c) Meandrina exhibits both polyp and medusa forms

Explanation:
1. Corals such as Meandrina exist only as polyps.

Teacher's Note:
1. Aurelia is a medusa.

Question 19: Identify the correct statement:
(a) Fertilisation is internal in Ctenophora
(b) Claspers are modified scales in Scoliodon
(c) Cyclostomes have teeth and a scaleless body
(d) Radula is a rasping organ of arthropods
Show Answer & Explanation

Answer: (c) Cyclostomes have teeth and a scaleless body

Explanation:
1. Cyclostomes have a scaleless body and a sucking mouth with horny teeth
2. Ctenophores have external fertilisation and radula belongs to molluscs.

Teacher's Note:
1. Claspers are pelvic fin modifications.

Question 20: In Osteichthyes:
(a) Fertilisation is internal
(b) Placoid scales are present
(c) A gill cover is present
(d) The air bladder is absent
Show Answer & Explanation

Answer: (c) A gill cover is present

Explanation:
1. Bony fishes have an operculum covering the gills
2. Fertilisation is external, scales are cycloid or ctenoid, and an air bladder is present.

Teacher's Note:
1. Operculum is the gill cover.

Question 21: Acraniates are lower chordates which possess:
(a) Unpaired appendages
(b) Cranium and vertebrae
(c) Paired appendages
(d) Jaws and exoskeleton
Show Answer & Explanation

Answer: (a) Unpaired appendages

Explanation:
1. Acraniates lack a cranium and have only unpaired fins.

Teacher's Note:
1. Branchiostoma is an acraniate.

Question 22: A phylum that is triploblastic, acoelomate and has a blind-sac body plan is:
(a) Ctenophora
(b) Platyhelminthes
(c) Coelenterata
(d) All of the above
Show Answer & Explanation

Answer: (b) Platyhelminthes

Explanation:
1. Flatworms are triploblastic acoelomates with an incomplete digestive tract
2. Ctenophores and cnidarians are diploblastic.

Teacher's Note:
1. Flame cells are characteristic.

Question 23: The first phylum with a complete digestive tract is represented by:
(a) Taenia
(b) Wuchereria
(c) Pheretima
(d) Apis
Show Answer & Explanation

Answer: (b) Wuchereria

Explanation:
1. Aschelminthes (roundworms) are the first with a complete gut having both mouth and anus.

Teacher's Note:
1. Wuchereria is an aschelminth.

Question 24: Which statement is NOT correct?
(a) The larva of Scoliodon exists
(b) The lateral line is absent in Bungarus
(c) The air bladder is present in Betta
(d) All chordates are deuterostomes
Show Answer & Explanation

Answer: (a) The larva of Scoliodon exists

Explanation:
1. Scoliodon shows direct development without a larval stage.

Teacher's Note:
1. Lateral line is a sense organ of fishes.

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