Jaws are absent in : (1) Birds (2) Fishes (3) Protochordates (4) Reptiles

Jaws are absent in : (1) Birds (2) Fishes (3) Protochordates (4) Reptiles 
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Protochordates
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Jaws are absent in – (1) Birds (2) Fishes (3) Protochordates (4) Reptiles

Description : Jaws are absent in – (1) Birds (2) Fishes (3) Protochordates (4) Reptiles

Last Answer : (3) Protochordates Explanation: Jaws are absent in Protochordates.

The population of which of the following is maximum on the earth? (1) Fishes (2) Beetles (3) Reptiles (4) Birds

Description : The population of which of the following is maximum on the earth? (1) Fishes (2) Beetles (3) Reptiles (4) Birds

Last Answer : (3) Reptiles Explanation: Fish as a community comprise the largest group on the earth as 72 percent of the worlds surface is covered with water. Fish are found from equatorial to polar climates; in salty or freshwater sources. It is assumed that life on the Earth began from fish.

Bones are pneumatic in - (1) Fishes (2) Amphibians (3) Reptiles (4) Birds

Description : Bones are pneumatic in - (1) Fishes (2) Amphibians (3) Reptiles (4) Birds

Last Answer : (4) Birds Explanation: Pneumatic boneis is hollow bone filled with air, connected to the respiratory system. Many of a bird's bones are pneumatic, with struts across their ... , certain physical characteristics are required. Flying birds have evolved reduced weight through several characteristics.

Which group of vertebrates comprises the highest number of endangered species? (a) Mammals (b) Fishes (c) Reptiles (d) Birds

Description : Which group of vertebrates comprises the highest number of endangered species? (a) Mammals (b) Fishes (c) Reptiles (d) Birds

Last Answer : (a) Mammals

The population of which of the following is maximum on the earth? (1) Fishes (2) Beetles (3) Reptiles (4) Birds

Description : The population of which of the following is maximum on the earth? (1) Fishes (2) Beetles (3) Reptiles (4) Birds 

Last Answer : Reptiles

Bones are pneumatic in (1) Fishes (2) Amphibians (3) Reptiles (4) Birds

Description : Bones are pneumatic in (1) Fishes (2) Amphibians (3) Reptiles (4) Birds

Last Answer : Birds

Choose the correct statement. (a) All mammals are viviparous. (b) All cyclostomes do not possess jaws and paired fins. (c) All reptiles have a three-chambered heart. (d) All pisces have gills covered by an operculum

Description : Choose the correct statement. (a) All mammals are viviparous. (b) All cyclostomes do not possess jaws and paired fins. (c) All reptiles have a three-chambered heart. (d) All pisces have gills covered by an operculum

Last Answer : (b) All cyclostomes do not possess jaws and paired fins.

Which of the following represents the correct combination without any exception ? Characteristics Class (a) Sucking and circular mouth; jaws absent, integument without scales; paired appendages. Cyclostomata (b) Body covered with feathers; skin moist and glandular, fore- limbs form wings; (c) Mammary gland; hair on body; pinnae; two pairs of limbs. Mammalia (d) Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord. Chondrichthyeslungs with air sacs. Aves

Description : Which of the following represents the correct combination without any exception ? Characteristics Class (a) Sucking and circular mouth; jaws absent, integument without scales; paired ... Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord. Chondrichthyes

Last Answer : (c) Mammary gland; hair on body; pinnae; two pairs of limbs. Mammalia

How has the importance of the brain evolved from fishes to reptiles?

Description : How has the importance of the brain evolved from fishes to reptiles?

Last Answer : From the least to the most complex brain structure, it is evident that the brain, from fishes to beings of the class Reptilia, became larger and predominant in the central nervous system. Image Diversity: reptilian brain

Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

Description : Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

Last Answer : In the majority of the amphibian species fecundation is external. This feature is common to bony fishes too and it shows that the reproductive system and the embryonic development of ... egg cells. This phenomenon does not characterize internal fecundation since the gametes unite in water.

The stability of a pond ecosystem depends on - (1) micro-organisms and fishes (2) micro-organisms and zoo planktons (3) fishes and reptiles (4) producers and consumers

Description : The stability of a pond ecosystem depends on - (1) micro-organisms and fishes (2) micro-organisms and zoo planktons (3) fishes and reptiles (4) producers and consumers

Last Answer : (4) producers and consumers

Which one of the following categories of animals, is correctly described with no single exception in it? (a) All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal). (b) All bony fishes have four pairs of gills and an operculum on each side. (c) All sponges are marine and have collared cells. (d) All mammals are viviparous and possess diaphragm for breathing.

Description : Which one of the following categories of animals, is correctly described with no single exception in it? (a) All reptiles possess scales, have a three chambered heart and are cold blooded ( ... marine and have collared cells. (d) All mammals are viviparous and possess diaphragm for breathing.

Last Answer : (b) All bony fishes have four pairs of gills and an operculum on each side

Which one of the following categories of animals, is correctly described with no single exception in it? (a) All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal). (b) All bony fishes have four pairs of gills and an operculum on each side. (c) All sponges are marine and have collared cells. (d) All mammals are viviparous and possess diaphragm for breathing.

Description : Which one of the following categories of animals, is correctly described with no single exception in it? (a) All reptiles possess scales, have a three chambered heart and are cold blooded ( ... marine and have collared cells. (d) All mammals are viviparous and possess diaphragm for breathing.

Last Answer : (b) All bony fishes have four pairs of gills and an operculum on each side.

Archeopteryx a transitional fossil between birds and reptiles was discovered from the rocks of following period

Description : Archeopteryx a transitional fossil between birds and reptiles was discovered from the rocks of following period

Last Answer : Archeopteryx a transitional fossil between birds and reptiles was discovered from the rocks of following ... Archeozoic era C. Cretaceous D. Triassic

Among mammals, the efficiency of ventilation of lungs as compared to reptiles and birds is better developed by the presence of

Description : Among mammals, the efficiency of ventilation of lungs as compared to reptiles and birds is better developed by the presence of

Last Answer : Among mammals, the efficiency of ventilation of lungs as compared to reptiles and birds is better ... Only ribs C. Only costal muscles D. Diaphragm

Archeopteryx a transitional fossil between birds and reptiles was discovered from the rocks of following period

Description : Archeopteryx a transitional fossil between birds and reptiles was discovered from the rocks of following period

Last Answer : Archeopteryx a transitional fossil between birds and reptiles was discovered from the rocks of following ... Archeozoic era C. Cretaceous D. Triassic

Cause of decline in population of reptiles and birds is

Description : Cause of decline in population of reptiles and birds is

Last Answer : Cause of decline in population of reptiles and birds is A. Bioinsecticides B. Biofertilizers C. DDT D. Both A and B

A connecting/missing link between reptiles and birds is

Description : A connecting/missing link between reptiles and birds is

Last Answer : A connecting/missing link between reptiles and birds is A. Archaeopteryx B. Platypus C. Java Ape man D. Whale

$ Sulphur depended archaebacteria are called thermoacidophiles. ! Archeopteryx is considered to be a connecting link between Birds and Reptiles.

Description : $ Sulphur depended archaebacteria are called thermoacidophiles. ! Archeopteryx is considered to be a connecting link between Birds and Reptiles.

Last Answer : $ Sulphur depended archaebacteria are called thermoacidophiles. ! Archeopteryx is considered to be a connecting link ... . If both As and R are wrong.

What do reptiles and birds have in common?

Description : What do reptiles and birds have in common?

Last Answer : they both lay eggs.

The end product of amino acid nitrogen metabolism in uricotelic organisms (reptiles and birds) is (A) Bilirubin (B) Urea (C) Uric acid (D) Biliverdin

Description : The end product of amino acid nitrogen metabolism in uricotelic organisms (reptiles and birds) is (A) Bilirubin (B) Urea (C) Uric acid (D) Biliverdin

Last Answer : Answer : C

What is the chorioallantois membrane present in the embryonic development of reptiles and birds ?

Description : What is the chorioallantois membrane present in the embryonic development of reptiles and birds ?

Last Answer : How does this membrane participate in the energetic metabolism of the embryo? The chorioallantois membrane is formed by juxtaposition of some regions of the chorion and the allantois. Since it is ... of gases between the embryo and the exterior thus making aerobic cellular respiration possible.

How different are reptiles and birds concerning the maintenance of body temperature? Are birds rare in polar regions?

Description : How different are reptiles and birds concerning the maintenance of body temperature? Are birds rare in polar regions?

Last Answer : Reptiles are heterothermic, i.e., they do not control their body temperature. Birds however are the first homeothermic animals, they are able to maintain their body temperature constant. There are many birds that live in intense cold regions. Penguins are examples of birds that live in polar region.

What similarities do birds and reptiles share regarding external coverage, reproduction and excretion?

Description : What similarities do birds and reptiles share regarding external coverage, reproduction and excretion?

Last Answer : Regarding external coverage, birds are similar to reptiles as they present impermeable keratinized coverages. Concerning reproduction, in both fecundation is internal and the embryo develops within a shelled egg. Regarding excretion, both excrete uric acid.

Syrinx is the voice box in - (1) Amphibians (2) Reptiles (3) Birds (4) Mammals

Description : Syrinx is the voice box in - (1) Amphibians (2) Reptiles (3) Birds (4) Mammals

Last Answer : (3) Birds Explanation: Syrinx is the name for the vocal organ of birds. Located at the base of a bird's trachea, it produces sounds without the vocal cords of mammals. The sound is ... the membrana tympaniformis (the walls of the syrinx) and the pessulus caused by air flowing through the syrinx.

Classify the following animals are reptiles, mammals, birds and fish.

Description : Classify the following animals are reptiles, mammals, birds and fish.

Last Answer : a) Blue whale----Mammals b) Cobra--------Reptile c) Panda--------Mammal d) Ostrich-------Bird e) Penguin------Bird f) Kiwi----------Bird g) Shark--------Fish h) Alligator -----Reptile i) Dolphin-------Mammal j) Tortoise------Reptile

Uricotelism is found in (a) mammals and birds (b) fish and fresh water protozoans (c) birds, land reptiles and insects (d) frogs and toads.

Description : Uricotelism is found in (a) mammals and birds (b) fish and fresh water protozoans (c) birds, land reptiles and insects (d) frogs and toads.

Last Answer : (c) birds, land reptiles and insects

Uricotelic mode of excreting nitrogenous wastes is found in (a) reptiles and birds (b) birds and annelids (c) amphibians and reptiles (d) insects and amphibians.

Description : Uricotelic mode of excreting nitrogenous wastes is found in (a) reptiles and birds (b) birds and annelids (c) amphibians and reptiles (d) insects and amphibians.

Last Answer : (a) reptiles and birds

Syrinx is the voice box in (1) Amphibians (2) Reptiles (3) Birds (4) Mammals

Description : Syrinx is the voice box in (1) Amphibians (2) Reptiles (3) Birds (4) Mammals

Last Answer : Birds

Are there mixed-breed fishes or birds?

Description : Are there mixed-breed fishes or birds?

Last Answer : answer:Seems to me that races in birds and fish would be the equivalent of breeds in dogs, no? One example that comes to mind in the fish world is the races of golden and rainbow trout ... as different species, but many consider the golden to be a sub-species of the rainbow. They can interbreed.

Which of the following vertebrates are without teeth? 1. Jawless fishes 2. Turtles and tortoises 3. Toads 4. Birds Codes: (a) 1, 2 (b) 2, 3 (c) 1, 4 (d) 2, 4

Description : Which of the following vertebrates are without teeth? 1. Jawless fishes 2. Turtles and tortoises 3. Toads 4. Birds Codes: (a) 1, 2 (b) 2, 3 (c) 1, 4 (d) 2, 4

Last Answer : Ans:(c)

Uric acid is the chief nitrogenous wastes in – (1) Frogs (2) Birds (3) Fishes (4) Mankind

Description : Uric acid is the chief nitrogenous wastes in – (1) Frogs (2) Birds (3) Fishes (4) Mankind

Last Answer : (2) Birds Explanation: Land snails, insects, birds, and some reptiles excrete uric acid as the major nitrogenous waste. The white, crystalline substance seen in a typical bird or lizard "poop" is actually urine: a little pool of uric acid crystals in a very small amount of water.

Darvvin finches' refers to a group of - (1) Fishes (2) Lizards (3) Birds (4) Amphibians

Description : Darvvin finches' refers to a group of - (1) Fishes (2) Lizards (3) Birds (4) Amphibians

Last Answer : (3) Birds Explanation: Darwin's finches (also known as the Galapagos finches) are a group of about 15 species of passerine birds. They often are classified as the subfamily Geospizinae or tribe ... . All are found only on the Galapagos Islands, except the Cocos Island Finch from Cocos Island.

‘Darwin finches’ refer to a group of : (1) Fishes (2) Lizards (3) Birds (4) Amphibians

Description : ‘Darwin finches’ refer to a group of : (1) Fishes (2) Lizards (3) Birds (4) Amphibians

Last Answer : (3) Birds Explanation: Darwin's finches are a group of about 15 species of passerine birds. They often are classified as the subfamily Geospizinae or tribe Geospizini. They were first collected by ... , and the beaks are highly adapted to different food sources. The birds are all dull-coloured.

Red Data Book contains information about? [a] Red coloured insects [b] Red eyed birds [c] Endangered plants and animals [d] Red coloured fishes [e] None of these

Description : Red Data Book contains information about? [a] Red coloured insects [b] Red eyed birds [c] Endangered plants and animals [d] Red coloured fishes [e] None of these

Last Answer : [c] Endangered plants and animals

Which one of the following statements is incorrect? (a) The principle of countercurrent flow facilitates efficient respiration in gills of fishes. (b) The residual air in lungs slightly decreases the efficiency of respiration in mammals. (c) The presence of non-respiratory air sacs, increases the efficiency of respiration in birds. (d) In insects, circulating body fluids serve to distribute oxygen to tissues.

Description : Which one of the following statements is incorrect? (a) The principle of countercurrent flow facilitates efficient respiration in gills of fishes. (b) The residual air in lungs slightly decreases the ... in birds. (d) In insects, circulating body fluids serve to distribute oxygen to tissues.

Last Answer : (b) The residual air in lungs slightly decreases the efficiency of respiration in mammals.

Uric acid is the chief nitrogenous wastes in (1) Frogs (2) Birds (3) Fishes (4) Mankind

Description : Uric acid is the chief nitrogenous wastes in (1) Frogs (2) Birds (3) Fishes (4) Mankind

Last Answer : Birds

‘Darwin finches’ refer to a group of : (1) Fishes (2) Lizards (3) Birds (4) Amphibians

Description : ‘Darwin finches’ refer to a group of : (1) Fishes (2) Lizards (3) Birds (4) Amphibians

Last Answer : Birds

Members of which subphyla are called protochordates?

Description : Members of which subphyla are called protochordates?

Last Answer : Members of which subphyla are called protochordates?

Open circulatory system is the one in which blood does not circulate only inside blood vessels but it also falls in cavities that irrigate tissues. In the open circulatory system the blood pressure is low and generally the blood (called hemolymph) has low cellularity. Arthropods, molluscs (the cephalopods are exception) and protochordates have open circulatory system. The Circulatory System - Image Diversity: open circulatory system

Description : Open circulatory system is the one in which blood does not circulate only inside blood vessels but it also falls in cavities that irrigate tissues. In the open circulatory system ... and protochordates have open circulatory system. The Circulatory System - Image Diversity: open circulatory system

Last Answer : What is a closed circulatory system?

Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly found protochordate species, what is an example of a discovery that would weaken the hypothesis? What is an example of a discovery that would strengthen it?

Description : Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly ... the hypothesis? What is an example of a discovery that would strengthen it?

Last Answer : Hypothesis to be tested: Vertebrates evolved from echinoderms. Testing material: A newly found protochordate species (i.e., a vertebrate forerunner). Example of weakening observation (that ... shows how science works, beginning with the placement of hypothesis and further observational testing.)

Into which subphyla are the protochordates divided? What are some representatives of each protochordate subphylum?

Description : Into which subphyla are the protochordates divided? What are some representatives of each protochordate subphylum?

Last Answer : Urochordates (or tunicates) and cephalochordates are the two subphyla into which protochordates are divided. Ascidians, sessile animals similar to sponges, are examples of tunicates. The amphioxus, well-studied in Embryology, is an example of cephalochordate.

What is the destination of the notochord in vertebrates and in protochordates?

Description : What is the destination of the notochord in vertebrates and in protochordates?

Last Answer : In vertebrates the notochord disappears and gives birth to the spinal column (vertebral column). In protochordates the notochord remains for the rest of the life.

The following structure is absent is birds B A. Pleura B. Diaphragm C. Pleural cavities D. Large instestine

Description : The following structure is absent is birds B A. Pleura B. Diaphragm C. Pleural cavities D. Large instestine

Last Answer : Diaphragm

The following structure is absent is birds B A. Pleura B. Diaphragm C. Pleural cavities D. Large instestine

Description : The following structure is absent is birds B A. Pleura B. Diaphragm C. Pleural cavities D. Large instestine

Last Answer : Diaphragm

Are women with pronounced jaws attractive to men?

Description : Are women with pronounced jaws attractive to men?

Last Answer : It’s just part of the facial structure.

Pain in jaws?

Description : Pain in jaws?

Last Answer : Talk to a doctor or dentist. You may get some comfort from wearing a bite guard at night, but there are a handful of things that could be causing your pain, and starting with a diagnosis would be the most helpful.

Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, my greedy lust devours them all. What am I? -Riddles

Description : Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, my greedy lust devours them all. What am I? -Riddles

Last Answer : Shears, or scissors.

Which group of chordates possess sucking and circular mouth without jaws?

Description : Which group of chordates possess sucking and circular mouth without jaws?

Last Answer : Which group of chordates possess sucking and circular mouth without jaws?

Are sparrows toothless beaked jaws?

Description : Are sparrows toothless beaked jaws?

Last Answer : Sparrows (several species worldwide) are mainly seed eating birds, with short strong beaks. During Summer, they will eat insects to feed to their young.