Description : in which of the following the notochord is present in embryonic stage
Last Answer : in which of the following the notochord is present in embryonic stage A. All chordates B. Some chordates C. Vertebrates D. Non- chordates
Description : The subphylum in which notochord is restricted only to the embryonic stage is
Last Answer : vertebrata.
Description : 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 ... (C) (b) (C) and (A) (c) (A) and (B) (d) (B) and (C)
Last Answer : (d) (B) and (C)
Description : $ Notochord is present in vertebrates. ! Notochord is always formed of bones.
Last Answer : $ Notochord is present in vertebrates. ! Notochord is always formed of bones. A. If both A and R are ... is wrong D. If both A and R are wrong.
Description : In some chordates, the notochord is replaced by cartilaginous or bony vertebral column. Name the chordates which possess this character.
Last Answer : In some chordates, the notochord is replaced by cartilaginous or bony vertebral column. Name the chordates which possess this character.
Description : Important characteristic that hemichordates share with chordates is (a) ventral tubular nerve cord (b) pharynx with gill slits (c) pharynx without gill slits (d) absence of notochord.
Last Answer : (b) pharynx with gill slits
Description : An important characteristic that Hemichordates share with Chordates is : (1) Ventral tubular nerve cord (2) Pharynx with gill slits (3) Pharynx without gill slits (4) Absence of notochord
Last Answer : (2) Pharynx with gill slits
Description : What are the extra embryonic membranes present in vertebrates ?
Last Answer : The extra embryonic membranes that may be present in vertebrates are the yolk sac, the amnion, the chorion, the allantois and the placenta.
Description : Does Vertibrata become embryonic notochord ?
Last Answer : Answer : In the vertebrate phase, the embryonic notochord turns into a nerve.
Description : What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?
Last Answer : Echinoderms and chordates are deuterostomes, i.e., in their embryonic development the blastopore turns into the anus. All other animals with complete digestive system are protostomes, i. ... digestive tube that appears in the embryonic development. Phylum Echinodermata - Image Diversity: blastopore
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.
Description : What are the differences between vertebrates and the other chordates?
Last Answer : Vertebrates are different because they have a spinal column (vertebral column). In these animals the notochord of the embryonic stage is substituted by the vertebral column in adults.
Description : Which of the following group of characters is present in all chordates in some or other stage in their life or Chordates differ from nonchordates in h
Last Answer : Which of the following group of characters is present in all chordates in some or other stage in ... D. Gill slits, vertebral column, and notochord
Description : Are the extra embryonic membranes the same in all vertebrates ?
Last Answer : The presence of each extra embryonic membrane varies according to the vertebrate class. In fishes and amphibians, only the yolk sac is present. In reptiles and aves besides the yolk sac, there ... and the allantois. In placental mammals besides all these membranes, the placenta is present too.
Description : Which of the following characters is shared by all chordates at some stage of life ?
Last Answer : Which of the following characters is shared by all chordates at some stage of life ? A. Notochord B. ... C. Pharyngeal gill slits D. All of the above
Description : Which one of the following phyla is correctly matched with its two general characteristics? (a) Echinodermata - pentamerous radial symmetry and mostly internal fertilization (b) Mollusca - normally ... Chordata - notochord at some stage and separate anal and urinary openings to the outside.
Last Answer : (c) Arthropoda - body divided into head, thorax and abdomen and respiration by tracheae
Description : Which of the following animals is devoid of notochord and nerve cord in its adult stage ?
Last Answer : Which of the following animals is devoid of notochord and nerve cord in its adult stage ? A. ... amphioxus ) C. Assymetron D. All of the above
Description : (i)Explain the events taking place at the time of fertilisation of an ovum in a human female. (ii)Trace the development of the zygote up to its implantation in the uterus. (iii)Name and draw a labelled sectional view of the embryonic stage that gets implanted. -Biology
Last Answer : (i)In humans, the fertilisation of ovum takes place in ampullary-isthmic junction of Fallopian tube. The events that occur during the process of fertilisation are: (a) The sperm reaches the ... endometrium of the uterus. This is called implantation.(iii) Blastocyst stage implants in the uterus.
Description : Study the given figure below and answer the question that follow important-questions-for-class-12-biology-cbse-fertilisation-pregnancy-and-embryonic-development-t-33-3 (i)Name the stage of human embryo the ... implantation in the uterus. (iv)Where are the stem cells located in this embryo? -Biology
Last Answer : (i)The stage is blastocyst. (ii) A—Trophoblast. It helps in attachment to endometrium during implantation and provides nourishment to developing embryo. (iii) Inner cell mass acts as precursor to embryo ... into ectoderm and endoderm. (iv) Stem cells are located in inner cell mass of embryo.
Description : Name the embryonic stage that gets implanted in the uterine wall of a human female. -Biology
Last Answer : Blastocyst gets implanted in the uterine wall.
Description : In which stage of development the embryonic cells form the germinal layers by the movement
Last Answer : In which stage of development the embryonic cells form the germinal layers by the movement A. Morula B. Blastula C. Gastrula D. Zygote
Description : Movement of blastomers usually seen in which embryonic stage :-
Last Answer : Movement of blastomers usually seen in which embryonic stage :- A. Morula B. Blastula C. Gastrula D. In all embryonic stages
Description : Three germ layers are formed during which stage of embryonic development :-
Last Answer : Three germ layers are formed during which stage of embryonic development :- A. Morula B. Blastula C. Gastrula D. In any two stages
Description : Assertion : Mucoid connective tissue is called as embryonic tissue. Reason : Mucoid connective tissue is mainly found in enbryonic stage .
Last Answer : Assertion : Mucoid connective tissue is called as embryonic tissue. Reason : Mucoid connective tissue is ... D. If both Assertion & Reason are false.
Description : What is the cell division during the first stage of the embryonic development called ?
Last Answer : How is this stage characterized? The cell division in the first stage of the embryonic developments is called cleavage, or segmentation. In this stage, mitosis occurs from the zygote forming the new embryo.
Description : What are the cells produced in the first stage of the embryonic development called ?
Last Answer : The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry).
Description : After the blastula stage what is the following stage of the embryonic development ?
Last Answer : How is the passage from blastula to the next stage called? The blastula turns into gastrula in a process known as gastrulation.
Last Answer : How is the passage from blastula to the next stage called? The blastula turns into gastrula in a process known as gastrulation. Image Diversity: gastrula
Last Answer : The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry). Image Diversity: morula
Description : How are the main classes of arthropods classified according to the presence of larval stage in their embryonic development?
Last Answer : In crustaceans there are species with direct and others with indirect development. In insects there are species without larval stage (ametabolic insects), others undergoing indirect ... while holometabolic insects undergo complete metamorphosis. Phylum Arthropoda - Image Diversity: metamorphosis
Description : pharyngeal gill slits in embryonic stage is a a) Anatomical evidence b) morphological evidence c) Embryological evidence d) fossil evidence
Last Answer : c) Embryological evidence
Description : In which group, notochord is present only in the tail of larva.
Last Answer : In which group, notochord is present only in the tail of larva.
Description : What does radial symmetry mean? What is the type of symmetry found in chordates? Which are other phyla of the animal kingdom that present species with radial symmetry?
Last Answer : Radial symmetry means (biologically) that the animal structures are situated in a radial or circular pattern around a center point with nonexistence of sides, like right or left. An ... Echinodermata. (It is considered that the simplicity of poriferans does not characterize any symmetry.)
Description : The subphylum in which notochord is present through the length of the body is
Last Answer : Cephalochordata.
Description : The subphylum in which notochord is present only in the tail region of the larvae and absent in adults is
Last Answer : Urochordata.
Description : Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct? (a) It is present only in larval tail in ascidian. (b) It is ... absent throughout life in humans from the very beginning. (d) It is present throughout life in Amphioxus.
Last Answer : (c) It is absent throughout life in humans from the very beginning.
Description : Comparison between Chordates and Non-chordates -Biology
Last Answer : answer:
Description : Chordates are distingished from non- chordates by the presence of
Last Answer : Chordates are distingished from non- chordates by the presence of A. Brain B. Dorsal tubular hollow ... Ventral nerve cord D. Dorsal soild nerve cord
Description : Name the phylum that forms connecting link between Chordates and Non-chordates.
Last Answer : Name the phylum that forms connecting link between Chordates and Non-chordates.
Description : How are animals classified according to the germ layers present in their embryonic development ?
Last Answer : Cnidarians are diploblastic, i.e., they present only endoderm and ectoderm. With the exception of poriferans, all remaining animals are triploblastic. Poriferans do not present differentiated tissue ... not classify regarding germ layers (although sometimes they are mentioned as diploblastic).
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.
Description : Which of the following features is not present in Periplaneta americana? (a) Exoskeleton composed of N-acetylglucosamine (b) Metamerically segmented body (c) Schizocoelom as body cavity (d) Indeterminate and radial cleavage during embryonic development
Last Answer : (a) Exoskeleton composed of N-acetylglucosamine
Description : what two groups of present-day vertebrates are the descendants of reptiles?
Last Answer : are alligator and snakes
Description : How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?
Last Answer : The echinoderm skeleton is internal, i.e., it is an endoskeleton. It is made of calcium carbonate (calcareous). Vertebrates also have internal skeleton made of bones and cartilages. Arthropods ... of chitin, a chitinous exoskeleton. Some molluscs present a calcareous shell that works as exoskeleton.
Description : In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self- cells, then it leads to (a) autoimmune disease (b) active immunity (c) allergic response (d) graft rejection.
Last Answer : (a) autoimmune disease
Description : how do lower chordates survive on their adaptive features?
Last Answer : echinoderms, cnidaria and other forms
Description : How many of the following chordates have flame cells as exretory organ. Planaria, Ascaris, Amphioxus, Tapeworm, Nereis, Scoliodon.
Last Answer : How many of the following chordates have flame cells as exretory organ. Planaria, Ascaris, Amphioxus, Tapeworm, ... A. One B. Two C. Three D. Four