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 : In which of the following prenatal periods does the unborn show rudimentary breathing movements? a. Germinal b. Visceral c. Embryonic d. Fetal
Last Answer : d. Fetal
Description : Which germ layer developes first during embryonic development?
Last Answer : Which germ layer developes first during embryonic development? A. Ectoderm B. Mesoderm C. Endoderm D. Both 1 and 3
Description : With respect to lens development: a. the lens first appears at 27 days of gestation b. it is formed from neural crest cells c. the lens first appears as a vesicles with a single layer of ... d. Y suture is absent in the embryonic nucleus e. the adult lens is more spherical than the foetal
Last Answer : the lens first appears at 27 days of gestation
Description : Gonads/testes develop from embryonic
Last Answer : Gonads/testes develop from embryonic A. Ectoderm B. Endoderm C. Mesoderm D. Both mesoderm and endoderm.
Description : Gonads develop from embryonic (a) ectoderm (b) endoderm (c) mesoderm (d) both mesoderm and endoderm.
Last Answer : (c) mesoderm
Description : What is embryonic layer ?
Last Answer : The embryonic layer is the cellular layer from which the tissues or organs are formed later.
Description : Which of the following embryonic layer formed gametes :
Last Answer : Which of the following embryonic layer formed gametes : A. Ectoderm B. Endoderm C. Mesoderm D. Mesoderm
Description : Skeletal tissue originated from which embryonic germinel layer :-
Last Answer : Skeletal tissue originated from which embryonic germinel layer :- A. Ectoderm B. Mesoderm C. Endoderm D. All the above
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 : 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 : During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called (a) organiser phenomena (b) axis formation (c) anamorphosis (d) pattern formation.
Last Answer : (a) organiser phenomena
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 : Metagenesis refers to (a) occurrence of a drastic change in form during post-embryonic development (b) presence of a segmented body and parthe- nogenetic mode of reproduction (c) presence of different morphic forms (d) alternation of generation between asexual and sexual phases of an organism.
Last Answer : (d) alternation of generation between asexual and sexual phases of an organism.
Description : The proces by which primary germinal layers are formed is called
Last Answer : The proces by which primary germinal layers are formed is called A. Blastulation B. Cleavage C. Gastrulation D. Implanatation
Description : Supporting cells found in between the germinal epithelium is called:
Last Answer : Supporting cells found in between the germinal epithelium is called: A. Interstitial cells of leydig B. Sertoli cells C. Granular cells D. Phagocytes
Description : Germinal epithelial cells are cuboidal and these are found in
Last Answer : Germinal epithelial cells are cuboidal and these are found in A. Testes B. Ovary C. Both D. None
Description : Assertion : Simple cuboidal epithelium is also called as germinal epithelium Reason : Cuboidal cells of gonads forms gametes
Last Answer : Assertion : Simple cuboidal epithelium is also called as germinal epithelium Reason : Cuboidal cells of ... . If both Assertion & Reason are false.
Description : Assertion : Glands originate from all germinal layers. Reason : All glands are composed of epithelium tissue.
Last Answer : Assertion : Glands originate from all germinal layers. Reason : All glands are composed of epithelium ... D. If both Assertion & Reason are false.
Description : Assertion : Simple columner epithelium is also called as Germinal epithelium. Reason : Columnar cells of gonads forms gametes .
Last Answer : Assertion : Simple columner epithelium is also called as Germinal epithelium. Reason : Columnar cells of ... D. If both Assertion & Reason are false.
Description : Germinal epithelium is composed of :-
Last Answer : Germinal epithelium is composed of :- A. Cubodial epithelium B. Columner epithelium C. Squamous epithelium D. Glandular epithelium
Description : Germinal Epithelium of overy is formed of : -
Last Answer : Germinal Epithelium of overy is formed of : - A. Columner Epithelium B. Squamous Epithelium C. Cuboidal Epithelium D. Stratified Epithelium
Description : The tissue in man where no cell division occurs after birth is - (1) skeletal (2) nerves (3) connective (4) germinal
Last Answer : (2) nerves Explanation: Cell division is the process by which cells produce new cells. Cell division differs in prokaryotes (bacteria) and eukaryotes (protists, fungi, plants, & animals). Some tissues must ... a short lifespan. Other cells do not divide at all after birth such as muscle & nerve.
Last Answer : (2) nerves Explanation: A nerve is an enclosed, cable-like bundle of axons (the long, slender projections of neurons) in the peripheral nervous system. A nerve provides a common pathway for the ... . These impulses are extremely fast, with some militated neurons conducting at speeds up to 120 m/s.
Description : The following are true about lymphocytes: a. T cells account for 20% of the circulating lymphocytes b. in the spleen, B cells are found in the periarteriolar areas of white pulp c. in the ... paracortical area surrounding the germinal centres. d. B cells but not T cells express surface Ig G
Last Answer : in the lymph nodes, T cells occupy the paracortical area surrounding the germinal centres
Description : True statements about chromosome include: a. 23 chromosomes are found in germinal cells b. in female only one chromosome is activated c. the Barr body is due to inactivated X chromosome e. all above
Last Answer : all above
Description : Which part of ovary in mammals acts as an endocrine gland after ovulation? (a) Stroma (b) Germinal epithelium (c) Vitelline membrane (d) Graafian follicle
Last Answer : (d) Graafian follicle
Description : The tissue in man where no cell division occurs after birth is (1) skeletal (2) nerves (3) connective(4) germinal
Last Answer : nerves
Description : Which part of cockroach bears exo and endoskeleton? -Do You Know?
Last Answer : answer:
Description : $ The skeleton which occurs on the surface of animal body is called exoskeleton. ! Endoskeleton is formed of bones.
Last Answer : $ The skeleton which occurs on the surface of animal body is called exoskeleton. ! Endoskeleton is formed of ... wrong D. If both As and R are wrong.
Description : in which part of cockroach is present completely developed endoskeleton and exoskeleton both ?
Last Answer : in which part of cockroach is present completely developed endoskeleton and exoskeleton both ? A. In ... region C. Abdominal region D. In all regions
Description : Do blob fish have an endoskeleton?
Last Answer : Need answer
Description : What material is in the endoskeleton of a sea star?
Last Answer : Feel Free to Answer
Description : Is a tiger shark endoskeleton or exoskeleton?
Last Answer : A tiger shark has an internal skeleton, so is endoskeleton.
Description : Does a killer whale have an endoskeleton or an exoskeleton?
Last Answer : All whales have internal skeletons and are vertebrates.
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 : How are fishes classified based on the composition of endoskeleton? Give example.
Last Answer : Based on the composition of exoskeleton, fishes are classified into: a) Cartilaginous fishes – containing only cartilage in endoskeleton. Ex: Shark and ray fish b) Bony fishes – endoskeleton composed of bones Ex: Hippocampus, Carp etc.
Description : The characteristics of Class Reptilia are (a) body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into ... dry and cornified skin, scales over the body are epidermal, they do not have external ears.
Last Answer : (d) body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears.
Description : Which of the following characteristic features always holds true for the corresponding group of animals? (a) Possess a mouth with an Chordata upper and a lower jaw (b) 3- ... heart with Reptilia one incompletely divided ventricle (c) Cartilaginous endoskeleton Chondrichthyes (d) Viviparous
Last Answer : (c) Cartilaginous endoskeleton
Description : Which one of the following characteristics is not shared by birds and mammals? (a) Viviparity (b) Warm blooded nature (c) Ossified endoskeleton (d) Breathing using lungs
Last Answer : (a) Viviparity
Description : Which part of cockroach bears exo and endoskeleton?
Last Answer : Head
Description : Endoskeleton of a cell is made up of (A) Microtubules (B) Microfilaments (C) Intermediate filaments (D) All of these
Last Answer : (D) All of these
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 : Correct sequence of human embryonic development is
Last Answer : Correct sequence of human embryonic development is A. Gastrocoel-Blastocoel-Neural Crest - ... . Blastocoel-Gastrucoel-Neural crest -Notochord.
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).