Practice MCQs for NEET Biology Animal Kingdom
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Multiple Choice Questions
(a) A ventrally placed nerve cord
(b) A water vascular system
(c) A chitinous exoskeleton
(d) An elastic rod (notochord)
Show Answer & Explanation
Answer: (d) An elastic rod (notochord)
Explanation:
1. Notochord is present in all chordates at some stage.
2. Chordates have a dorsal nerve cord.
Teacher's Note:
1. Chordates: notochord, dorsal hollow nerve cord, pharyngeal gill slits.
(a) Dorsal nerve cord below the gut
(b) A single hollow nerve cord dorsal to the gut
(c) Double ventral nerve cord
(d) A single solid ventral nerve cord
Show Answer & Explanation
Answer: (b) A single hollow nerve cord dorsal to the gut
Explanation:
1. The chordate nerve cord is dorsal, hollow and single.
2. Non-chordates have a solid ventral cord.
Teacher's Note:
1. Remember hollow dorsal vs solid ventral.
(a) Persists throughout life
(b) Is partially replaced by vertebral column
(c) Is completely replaced by vertebral column
(d) Is partially or fully replaced by vertebral column
Show Answer & Explanation
Answer: (d) Is partially or fully replaced by vertebral column
Explanation:
1. In vertebrates the notochord is replaced fully (higher forms) or partially (cyclostomes) by the vertebral column.
2. In protochordates it persists.
Teacher's Note:
1. Notochord is present in the embryo of all chordates.
(a) An internal bony or cartilaginous skeleton
(b) A hairy body covering
(c) Presence of mammary glands
(d) Open type of circulatory system
Show Answer & Explanation
Answer: (a) An internal bony or cartilaginous skeleton
Explanation:
1. Vertebrates have a bony or cartilaginous vertebral column.
2. Hair and mammary glands are mammalian features.
Teacher's Note:
1. Vertebrata has a closed circulatory system.
(a) Africa, South America and Australia
(b) Africa, Australia and Japan
(c) India, Africa and South America
(d) South America, England and Africa
Show Answer & Explanation
Answer: (a) Africa, South America and Australia
Explanation:
1. Protopterus lives in Africa, Lepidosiren in South America and Neoceratodus in Australia.
2. Dipnoi are lung fish.
Teacher's Note:
1. Lung fishes can survive dry spells by aestivation.
(a) Chimaera
(b) Latimeria
(c) Pristis
(d) Harpodon
Show Answer & Explanation
Answer: (b) Latimeria
Explanation:
1. Latimeria (coelacanth) was thought extinct until it was found alive.
2. It is a lobe-finned fish.
Teacher's Note:
1. Coelacanth links fishes and amphibians.
(a) Bufo
(b) Ichthyophis
(c) Frog
(d) Salamandra
Show Answer & Explanation
Answer: (b) Ichthyophis
Explanation:
1. The limbless Ichthyophis (Apoda) has dermal scales hidden in the skin.
2. Bufo, frog and Salamandra have smooth skin.
Teacher's Note:
1. Apoda = legless amphibians.
(a) The larva will die soon
(b) Its skin pigmentation will change
(c) It will start metamorphosis
(d) It remains as usual without any change
Show Answer & Explanation
Answer: (c) It will start metamorphosis
Explanation:
1. Iodine allows thyroxine formation and triggers metamorphosis of Axolotl into Ambystoma.
2. Thyroxine is needed for amphibian metamorphosis.
Teacher's Note:
1. Axolotl shows neoteny due to iodine deficiency.
(a) Ampulla of Lorenzini
(b) Utriculus
(c) Air bladder
(d) Internal ear
Show Answer & Explanation
Answer: (d) Internal ear
Explanation:
1. The internal ear helps in balance and hearing.
2. Air bladder regulates buoyancy.
Teacher's Note:
1. Fishes have an inner ear only.
(a) Reptiles, Aves and Mammalia
(b) Aves and Cyclostomata
(c) Pisces and Amphibia
(d) Aves and Mammalia
Show Answer & Explanation
Answer: (d) Aves and Mammalia
Explanation:
1. Birds and mammals are homeothermic.
2. Reptiles, fishes and amphibians are poikilothermic.
Teacher's Note:
1. Warm-blooded = homeothermic.
(a) Pronephric
(b) Mesonephric
(c) Archaeonephric
(d) Metanephric
Show Answer & Explanation
Answer: (b) Mesonephric
Explanation:
1. Adult amphibians have mesonephric kidneys.
2. Pronephros is in the larva.
Teacher's Note:
1. Reptiles, birds and mammals have metanephric kidneys.
(a) Homodont, pleurodont and diphyodont
(b) Thecodont, heterodont and diphyodont
(c) Homodont, pleurodont and polyphyodont
(d) Homodont, thecodont and polyphyodont
Show Answer & Explanation
Answer: (c) Homodont, pleurodont and polyphyodont
Explanation:
1. Frog teeth are alike (homodont), fused to the jaw (pleurodont) and replaced many times (polyphyodont).
2. Mammals are thecodont and diphyodont.
Teacher's Note:
1. Mammalian teeth: thecodont, heterodont and diphyodont.
(a) Pisces
(b) Reptilia
(c) Aves
(d) Mammalia
Show Answer & Explanation
Answer: (a) Pisces
Explanation:
1. Pisces (fishes) is the largest group of vertebrates.
2. Fishes outnumber the other classes.
Teacher's Note:
1. Insects are the largest in the whole animal kingdom.
(a) Toad
(b) Snake
(c) Fish
(d) Cockroach
Show Answer & Explanation
Answer: (b) Snake
Explanation:
1. Reptiles, birds and mammals are amniotes.
2. Fishes and amphibians lack an amnion.
Teacher's Note:
1. Amniotes develop on land with extra-embryonic membranes.
(a) Crocodile, alligator, turtle
(b) Whale, pigeon, bat
(c) Sea horse, dog fish, cat fish
(d) Toad, frog, salamander
Show Answer & Explanation
Answer: (b) Whale, pigeon, bat
Explanation:
1. Whale and bat are mammals and pigeon is a bird, all of which are warm blooded.
2. The others are cold blooded.
Teacher's Note:
1. Birds and mammals are endothermic.
(a) Kiwi
(b) Ostrich
(c) Dodo
(d) Archaeopteryx
Show Answer & Explanation
Answer: (d) Archaeopteryx
Explanation:
1. Archaeopteryx, the earliest bird, had teeth, claws and a long tail.
2. Modern birds have toothless beaks.
Teacher's Note:
1. Archaeopteryx is a link between reptiles and birds.
(a) Uricotelic and oviparous
(b) Uricotelic and viviparous
(c) Ammonotelic and oviparous
(d) Uricotelic and ovoviviparous
Show Answer & Explanation
Answer: (a) Uricotelic and oviparous
Explanation:
1. Birds excrete uric acid and lay eggs.
2. They are not viviparous.
Teacher's Note:
1. Birds have a four-chambered heart.
(a) Is a degenerated mammal
(b) Shows the stage between aves and mammals
(c) Shows the stage between reptiles and birds
(d) Shows the stage between reptiles and mammals
Show Answer & Explanation
Answer: (d) Shows the stage between reptiles and mammals
Explanation:
1. Platypus lays eggs like reptiles but has hair and mammary glands.
2. It is a connecting link between reptiles and mammals.
Teacher's Note:
1. Monotremes are egg-laying mammals.
(a) Unisexual and sexual dimorphism absent
(b) Bisexual and sexual dimorphism absent
(c) Unisexual and sexual dimorphism present
(d) Bisexual and sexual dimorphism present
Show Answer & Explanation
Answer: (c) Unisexual and sexual dimorphism present
Explanation:
1. Birds are unisexual and the male and female differ in plumage (sexual dimorphism).
2. Examples: peacock and peahen.
Teacher's Note:
1. Dimorphism is evident in peacocks and sparrows.
(a) Archaeopteryx
(b) Struthio
(c) Aptenodytes
(d) Humming bird
Show Answer & Explanation
Answer: (a) Archaeopteryx
Explanation:
1. Archaeopteryx shows both reptilian and avian features.
2. Struthio is ostrich and Aptenodytes is penguin.
Teacher's Note:
1. Archaeopteryx = ancient wing.
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FAQs
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