Free NEET Biology multiple-choice questions on Chordata (Fish to Mammalia). Attempt each question and reveal the answer with a full explanation.
The condition 'Azoospermia' refers to: Absence of sperm in the semen Low sperm count in the semen Low motility of sperm Abnormal morphology of sperm Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system Aves Reptilia Amphibia Osteichthyes How many functional sperms are produced from a single primary spermatocyte? 4 1 2 8 Which layer of the microsporangium provides nourishment to the developing pollen grains? Tapetum Endothecium Middle layers Epidermis Which of the following plants was introduced into India as a contaminant with imported wheat and causes widespread pollen allergy? Parthenium Amaranthus Chenopodium Cynodon Why is there a statutory ban on amniocentesis for sex determination in India? To prevent female foeticide To prevent chromosomal abnormalities To encourage the use of other contraceptive methods To reduce the risk of miscarriage In which of the following organisms does parthenogenesis occur naturally, where the female gamete develops into a new organism without fertilization? Turkey Earthworm Frog Human In some plants, the female gamete develops into an embryo without fertilization. This phenomenon is known as: Parthenogenesis Autogamy Parthenocarpy Syngamy In a grass embryo, the protective sheath covering the radicle is called and the sheath covering the plumule is called . Coleorhiza; Coleoptile Coleoptile; Coleorhiza Scutellum; Epiblast Epiblast; Scutellum Homology indicates common ancestry. Which of the following is a homologous structure to the wing of a bird? Flipper of a whale Wing of a butterfly Dorsal fin of a shark Wing of a moth The discovery of which 'living fossil' fish in South Africa in 1938 provided evidence for the evolution of amphibians from fish? Coelacanth Ichthyosaurus Lungfish Sturgeon In birds, the mechanism of sex determination is of which type? ZW-ZZ type XX-XY type XX-XO type Haplo-diploidy Which one of these animals is not a homeotherm? Camelus Chelone Macropus Psittacula In moths and butterflies (Order Lepidoptera), the sex determination mechanism is: ZW-ZZ (Female heterogamety) XX-XY (Male heterogamety) XX-XO (Male heterogamety) Haplodiploidy What is common between parrot, platypus and kangaroo? toothless jaws functional post-end tail ovoparity homoiothermy Which of the following characteristic features always holds true for the corresponding group of animals? (1) Cartilaginous endoskeleton → Chondrichthyes (2) Viviparous → Mammalia (3) Possess a mouth with an upper and a lower jaw → Chordata (4) 3 - chambered heart with one incompletely divided ventricle → Reptilia Which of the following statements are true for the phylum-Chordata? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata. (1) (c) and (a) (2) (a) and (b) (3) (b) and (c) (4) (d) and (c) Match the following columns and array ll Column-I & Column-II (a) 6-15 pairs of gill slits & (i) Trygon (b) Heterocercal caudal fin & (ii) Cyclostomes (c) Air Bladder & (iii) Chondrichthyes (d) Poison sting & (iv) Osteichthyes array select the correct option. a-iii, b-iv, c-i, d-ii a-iv, b-ii, c-iii, d-i a-i, b-iv, c-iii, d-ii a-ii, b-iii, c-iv, d-i In which of the following animals, digestive tract has additional chambers like crop and gizzard? Bufo, Balaenoptera, Bangarus Catla, Columba, Crocodilus Pavo, Psittacula, Corvus Corvus, Columba, Chameleon Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrates. Reason (R) : Notochord is replaced by vertebral column in the adult vertebrates. In the light of the above statements, choose the most appropriate answer from the option given below : Both (A) and (R) are correct but (R) is not the correct explanation of (A) (A) is correct but (R) is not correct (A) is not correct but (R) is correct Both (A) and (R) are correct and (R) is the correct explanation of (A) Nitrogenous waste is excreted in the form of pellet or paste by : Salamandra Hippocampus Pavo Ornithorhynchus Select the correct statements with reference to chordates. A. Presence of a mid-dorsal, solid and double nerve cord. B. Presence of closed circulatory system. C. Presence of paired pharyngeal gill slits. D. Presence of dorsal heart E. Triploblastic pseudocoelomate animals. Choose the correct answer from the options given below: A, C and D only B and C only B, D and E only C, D and E only Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate. Reason (R) : The members of subphylum vertebrata possess notochord during the embryonic period, the notochord is replaced by cartilaginous or bony vertebral column in adults. In the light of the above statements, choose the correct answer from the options given below: (A) is false but (R) is true Both (A) and (R) are true and (R) is the correct explanation of (A) Both (A) and (R) are true but (R) is not the correct explanation of (A) (A) is true but (R) is false Which one of the following organisms bears hollow and pneumatic long bones? Hemidactylus Macropus Ornithorhynchus Neophron A group of researchers procured some fish like animals and upon investigation the following characters were observed: A. Endoskeleton was made of cartilage. B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth. C. Paired fins and scales were absent, but 7 pairs of gill slits were present. Which of the following species of animals did they consider to fit best with these characters? Scoliodon sp. Exocoetus sp. Petromyzon sp. Branchiostoma sp. Given below are two statements: Statement I : The class name Reptilia refers to creeping or crawling mode of locomotion. Statement II : All organisms belonging to Reptilia have three chambered heart. In the light of the above statements, choose the most appropriate answer from the options given below: Both Statement I and Statement II are correct Both Statement I and Statement II are incorrect Statement I is correct but Statement II is incorrect Statement I is incorrect but Statement II is correct Which of the following is not a characteristic of chordates? Presence of notochord Central nervous system is dorsal Absence of gills Presence of post anal part (tail) The unique mammalian characteristics are: hairs, tympanic membrane and mammary glands hairs, pinna and mammary glands hairs, pinna and indirect development pinna, monocondylic skull and mammary glands Match List I with List II : array ll List I & List II A. Pterophyllum & I. Hag fish B. Myxine & II. Saw fish C. Pristis & III. Angel fish D. Exocoetus & IV. Flying fish array Choose the correct answer from the options given below : A-II, B-I, C-III, D-IV A-III, B-I, C-II, D-IV A-IV, B-I, C-II, D-III A-III, B-II, C-I, D-IV All living members of the class Cyclostomata are : Ectoparasite Free living Endoparasite Symbiotic The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as: Psittacula Aptenodytes Neophron Struthio Select the set of fishes which belong to the class Osteichthyes: Saw fish, Fighting fish and Dog fish Devil fish, Cuttlefish and Hagfish Starfish, Hagfish and Cuttlefish Flying fish, Angel fish and Fighting fish Which of the following vertebrate classes is characterized by having a 'dicondylic' skull? Amphibia and Mammalia Reptilia and Aves Amphibia and Reptilia Mammalia and Aves Which of the following is NOT a characteristic of the class Amphibia? The skin is dry and covered with scales The body is divisible into head and trunk A tympanum represents the ear They have a three-chambered heart Which part of the sperm contains the enzymes that help in the fertilization of the ovum? Acrosome Middle piece Tail Neck Which of the following reptiles possesses a four-chambered heart? Crocodilus Chelone Testudo Naja Which of the following is a viviparous mammal? Macropus (Kangaroo) Ornithorhynchus (Platypus) Pteropus (Flying fox) Canis (Dog) In amphibians, the structure that represents the ear is the: Tympanum Pinna Labyrinth Stapes Reptiles are characterized as 'poikilotherms'. This means they: Lack the capacity to regulate constant body temperature Can maintain a constant body temperature Are always warm-blooded Hibernate only during the summer The presence of a diaphragm to separate the thoracic and abdominal cavities is a unique feature of: Mammalia Aves Reptilia Amphibia Which of the following is an example of a 'Tree frog'? Hyla Bufo Rana Salamandra Which of the following birds is commonly known as the 'Vulture'? Neophron Struthio Psittacula Pavo Which of the following mammals is commonly known as the 'Flying fox'? Pteropus Macropus Canis Felis In a frog, the heart is enclosed in a double-walled membranous sac called the: Pericardium Pleura Peritoneum Epicardium The ventral skin of a frog is characterized as being: Uniformly pale yellow Olive green with dark spots Dry and scaly Brightly striped An acromian process is characteristically found in the - Skull of frog Sperm of mammals Pelvic girdle of mammals Pectoral girdle of mammals In the respiratory system of a frog, the passage of air into the lungs is controlled by the opening called the: Glottis Gullet Cloaca Tympanum Bidder's canal is present in: Male frog Female frog Both male and female frog None of these In male frogs, the vasa efferentia are 10-12 in number and arise from: Testes Kidneys Cloaca Urinary bladder Identify the correct statement regarding the respiration of frogs: During aestivation and hibernation, gaseous exchange takes place through skin. Frogs never respire through lungs. Respiration on land is only through the buccal cavity. The skin is dry and non-mucus secreting to prevent water loss. The brain of a frog is divided into forebrain, midbrain and hindbrain. The midbrain is characterized by: Optic lobes Cerebellum Medulla oblongata Olfactory lobes In a frog, the ureters in males act as: Urinogenital duct Urinary duct only Sperm duct only Oviduct During the breeding season, male frogs can be distinguished from female frogs by the presence of: Nuptial pads on the first digit of the forelimbs Vocal sacs in the abdominal region Larger body size Brighter skin color The special venous connection between the kidneys and the lower parts of the body in a frog is known as: Renal portal system Hepatic portal system Pulmonary system Systemic circulation In male frogs, the testes are adhered to the upper part of the kidneys by a double fold of peritoneum known as: Mesorchium Mesovarium Mesentery Pericardium How many pairs of cranial nerves arise from the brain of a frog? 10 pairs 12 pairs 8 pairs 14 pairs Which of the following characters is not typical of the class Mammalia - Alveolar lungs Ten pairs of cranial nerves Seven cervical vertebrae Thecodont dentition The triangular structure that joins the right atrium of the frog's heart and receives blood through the vena cava is the: Sinus venosus Conus arteriosus Truncus arteriosus Systemic arch In frogs, the medulla oblongata passes out through a large opening in the skull to continue as the spinal cord. This opening is the: Foramen magnum Foramen of Monro Fenestra ovalis Obturator foramen Which of the following statements regarding the blood of a frog is correct? RBCs are nucleated and contain haemoglobin RBCs are non-nucleated and contain haemoglobin Blood lacks a respiratory pigment WBCs are the most abundant cells in the blood The mouth of a frog contains small, pointed teeth on the upper jaw and on the roof of the mouth. The teeth on the roof are specifically called: Vomerine teeth Maxillary teeth Canine teeth Molar teeth Which structure in the frog's circulatory system receives deoxygenated blood from the major veins (Vena cava) before it enters the right atrium? Sinus venosus Conus arteriosus Truncus arteriosus Pulmonary vein The mature erythrocytes (RBCs) of a frog are characterized by being: Nucleated and biconvex Enucleated and biconcave Nucleated and biconcave Enucleated and spherical In the brain of a frog, the optic lobes are a prominent part of the: Midbrain Forebrain Hindbrain Diencephalon In frogs, the undigested solid waste, urine, and gametes are all discharged through a common small, median chamber called: Cloaca Ureter Rectum Urinary bladder In a male frog, copulatory pads are found on the: First digit of the forelimbs First digit of the hindlimbs All digits of the forelimbs All digits of the hindlimbs How many pairs of spinal nerves are present in a frog? 10 pairs 12 pairs 8 pairs 31 pairs In which one of the following sets of animals do all the four give birth to young ones ? (1) Lion, Bat, Whale, Ostrich (2) Platypus, Penguin, Bat, Hippopotamus (3) Shrew, Bat, Cat, Kiwi (4) Kangaroo, Hedgehog, Dolphin, Loris Which organ in the frog is responsible for receiving sound waves? Tympanum External ear Internal ear only Columella auris In the frog's heart, the sinus venosus opens into the: Right atrium Left atrium Ventricle Conus arteriosus The sensory organ in the frog responsible for hearing and balancing is the ear. It consists of the tympanum and a single bone in the middle ear called the: Columella auris Stapes Malleus Incus Which of the following statements about reproduction in frogs is correct? Fertilization is external and takes place in water Fertilization is internal and takes place in the oviduct A female frog can lay up to 10,000 eggs at a time Male frogs possess a penis for internal sperm transfer The alimentary canal of a frog is relatively short compared to its body size because: Frogs are carnivores Frogs are herbivores Frogs have high metabolic rates Frogs lack a stomach In a frog, the thin-walled, triangular, bilobed structure that stores urine and opens into the cloaca is the: Urinary bladder Ureter Rectum Kidney The 'Vasa efferentia' in a male frog carry sperm from the testes to the: Bidder's canal Ureter Cloaca Urinary bladder Which of the following is a characteristic of the frog's respiratory system during hibernation? Cutaneous respiration Pulmonary respiration Buccal respiration Branchial respiration The heart of a frog pumps blood out through a large, tubular structure that divides into two aortae. This structure is the: Truncus arteriosus Sinus venosus Vena cava Pulmonary vein The ovaries in a female frog are attached to the kidneys by a double fold of peritoneum called the: Mesovarium Mesorchium Oviduct Ureter Which one of the following pairs of animals comprises 'Jawless fishes' ? Guppies and hag fishes Lampreys and eels Mackeral and Rohu Lampreys and hag fishes The part of the frog's brain that controls involuntary functions like respiration and heart rate, and passes through the foramen magnum, is the: Medulla oblongata Cerebellum Optic lobes Cerebrum The type of kidney found in an adult frog, which consists of a compact, dark red, bean-like structure, is: Mesonephros Pronephros Metanephros Archinephros In a female frog, the ureters and the oviducts: Open separately into the cloaca Join to form a common urogenital duct Open into the urinary bladder Join the rectum directly Sensory papillae in frogs are primarily involved in the detection of: Touch Sound Light Chemicals In the frog's brain, the structure that connects the two optic lobes is the: Optic chiasma Corpus callosum Foramen of Monro Crura cerebri In frogs, the 'Jacobson's organ' (if present in rudimentary form) or similar sensory structures are associated with: Smell Vision Hearing Touch The tenth ( 10 th ) cranial nerve in a frog, which supplies the heart, lungs, and stomach, is the: Vagus nerve Optic nerve Trigeminal nerve Olfactory nerve The third eyelid in a frog, which protects the eye while it is under water, is the: Nictitating membrane Tympanum Choroid Sclera The digestive system of a frog consists of an alimentary canal and digestive glands. The food is captured by the: Bifid tongue Teeth on lower jaw Cilia in buccal cavity Sticky skin In terms of nitrogenous waste excretion, the adult frog is: Ureotelic Ammonotelic Uricotelic Aminotelic A marine cartilaginous fish that can produce electric current is :- Pristis Torpedo Trygon Scoliodon Male frogs can produce a loud sound because of the presence of: Vocal sacs Copulatory pads Tympanum Larynx with vocal cords Which of the following statements is INCORRECT regarding the skin of a frog? The skin is dry and scale-covered to prevent water loss The skin is moist and slippery due to mucus secretion The skin is used for diffusion of respiratory gases in water The skin is generally olive green with dark irregular spots dorsally The kidneys in a frog are located: Posteriorly in the body cavity on both sides of the vertebral column Anteriorly near the lungs Inside the liver lobes Attached to the ventral abdominal wall During unfavorable conditions (summer and winter), frogs undergo a process of rest called: Aestivation and Hibernation Migration Camouflage Metamorphosis The larval stage of a frog is called a tadpole, which respires through: Gills Lungs Skin Buccal cavity In a frog, the 'cloaca' is a common chamber for the exit of: Faecal matter, urine, and sperms Only faecal matter Only urine and sperms Faecal matter and digestive enzymes In frog, the special venous connection between the liver and intestine is called: Hepatic portal system Renal portal system Hypophyseal portal system Pulmonary portal system The vomerine teeth in a frog are located on the: Roof of the buccal cavity Lower jaw Tongue Esophagus The heart of a frog has: Two atria and one ventricle One atrium and two ventricles Two atria and two ventricles One atrium and one ventricle In the life cycle of a frog, the tadpole stage respires primarily using: Gills Lungs Skin Buccal cavity Which one of the following characteristics is not shared by birds and mammals ? (1) Ossified endoskeleton (2) Breathing using lungs (3) Viviparity (4) Warm blooded nature The circulatory system of a frog is closed and myogenic. The heart is composed of: Two atria and one ventricle One atrium and one ventricle Two atria and two ventricles One atrium and two ventricles In frogs, the skin serves as an important respiratory organ. This mode of respiration is called: Cutaneous respiration Pulmonary respiration Buccal respiration Brachial respiration Which of the following organs is derived from the embryonic mesoderm? Heart Brain Liver Lungs In the developing human embryo, the heart is primarily derived from which germ layer? Mesoderm Ectoderm Endoderm Ecto-mesoderm In the process of human spermatogenesis, the first haploid cells produced are: Secondary spermatocytes Primary spermatocytes Spermatogonia Spermatids Identify the correct path of the vas deferens in the human male reproductive system. Ascends to the abdomen and loops over the urinary bladder Descends through the inguinal canal into the scrotum Passes directly from the epididymis to the prostate gland Loops around the ureter before entering the testis The process of transformation of a non-motile spermatid into a motile spermatozoon is termed and it occurs in the . Spermiogenesis; Seminiferous tubules Spermiogenesis; Epididymis Spermiation; Seminiferous tubules Spermatogenesis; Vas deferens Which of the following structures is considered the male equivalent of the female's clitoris in terms of embryonic origin? Glans penis Scrotum Prostate gland Seminal vesicle Identify the correct sequence of events in the human male reproductive system leading to the release of sperm. Spermatogenesis Spermiogenesis Spermiation Spermiogenesis Spermatogenesis Spermiation Spermiation Spermiogenesis Spermatogenesis Spermatogenesis Spermiation Spermiogenesis The process of release of sperm from the seminiferous tubules is called: Spermiation Spermiogenesis Spermatogenesis Insemination Choose the false statement regarding Petromyzon The circulatory system is closed The body is devoid of scales Mouth is circular and lacks jaws It migrates to the ocean for spawning The external genitalia in human females, homologous to the scrotum in males, is the: Labia majora Labia minora Clitoris Mons pubis Which of the following describes the 'Nebenkern' in human sperm? The spiral arrangement of mitochondria in the middle piece The protective layer surrounding the head of the sperm The proximal centriole located in the neck The specialized Golgi body in the acrosome Which cells in the fetal testes produce the Mullerian Inhibiting Substance (MIS) to prevent the development of female reproductive ducts? Sertoli cells Leydig cells Spermatogonia Myoid cells The approximate time taken for a single spermatogonium to develop into mature spermatozoa in a human male is: 64-74 days 24-30 days 14 days 120 days The primary function of the 'Blood-Testis Barrier' (BTB) is to: Prevent the immune system from attacking developing germ cells Stop the entry of hormones into the seminiferous tubules Ensure the constant flow of blood to the Leydig cells Regulate the temperature of the seminiferous tubules Which component of the seminal vesicle secretion helps in the contraction of the uterine muscles to facilitate sperm movement? Prostaglandins Fructose Clotting proteins Citrate The secretion from which of the following glands helps in the lubrication of the penis? Bulbourethral glands Prostate gland Seminal vesicles Leydig cells In human sperm, the mitochondria are arranged in a spiral manner in the middle piece. This arrangement is specifically called: Nebenkern Axoneme Acrosome Centriole Which of the following layers of the adrenal gland or other organs is NOT derived from the embryonic mesoderm? Nervous system Dermis of skin Circulatory system Muscular system The first menstruation that begins at puberty in human females is called: Menarche Menopause Menses Luteal phase