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 : Archaebacteria differ from eubacteria in (a) cell membrane structure (b) mode of nutrition (c) cell shape (d) mode of reproduction.
Last Answer : (a) cell membrane structure
Description : In five kingdom system, the main basis of classification is (a) structure of nucleus (b) mode of nutrition (c) structure of cell wall (d) asexual reproduction.
Last Answer : (b) mode of nutrition
Description : Eukaryotic cell organelles first emerged A.from a specialized lineage of cells within the kingdom Protista B.when prokaryotes engulfed each other and became interdependent C.when bacteria made their first attempts at reproduction D.just before the origin of the animal and fungal kingdoms
Last Answer : B.when prokaryotes engulfed each other and became interdependent
Description : Which of the following is a function of Vitamin A in the body? A. Vision, bone and body growth B. Immune defenses, maintenance of body linings and skin C. Normal cell development and reproduction D. All of the above (Answer)
Last Answer : D. All of the above (Answer)
Description : Read the following five statements (A - E) and answer as asked next to them. (A) In Equisetum, the female gametophyte is retained on the parent sporophyte. (B) In Ginkgo, male gametophyte is not independent. (C ... . How many of the above statements are correct? (a) Two (b) Three (c) Four (d) One
Last Answer : (d) One
Description : Study the four statements (A-D) given below and select the two correct ones out of them. A. Definition of biological species was given by Ernst Mayr. B. Photoperiod does not affect reproduction in plants. C. Binomial nomenclature ... are (a) B and C (b) C and D (c) A and D (d) A and B.
Last Answer : (c) A and D
Description : Which one of the following statements aptly define the term Taxonomy ? a. Branch of science concerned with classification, especially of organisms. b. Study which deals with emotional ... reproduction in cattle. d. Branch of zoology concerned with habitat preference among nocturnal organisms.
Last Answer : a. Branch of science concerned with classification, especially of organisms.
Description : Which one of the following statements aptly define the term Taxonomy ? a. Branch of science concerned with classification, especially of organisms. b. Study which deals with emotional ... reproduction in cattle. d. Branch of zoology concerned with habitat preference among nocturnal organisms
Description : Answer: Physiology is the study of structure and functions.
Last Answer : What is the importance of 2nd December 1942?
Description : Can you consider cell division as a type of reproduction in unicellular organism? Give one reason. -Biology
Last Answer : Unicellular organisms reproduce by asexual reproduction which is simple division of parent cell into two daughter cells. Now, these two daughter cells grow into mature organism. Hence, cell division can be considered as mode of reproduction in single celled organisms
Description : Science is close to making human sperm from human skin cells. How will we ensure that all reproduction is voluntary?
Last Answer : answer:Interesting. Of course, similar questions were asked when science showed that it could indeed clone animals but the fact that it's skin cells makes the whole process more .worrisome. If I remember ... , and in utero death. I wonder if these created sperm would be viable and stable.
Description : Genetics is the branch of science that deals with the study of (a) Relations between plants and the environment (b) Inheritance and variation (c) Cell structure (d) Thermal structures
Last Answer : Ans:(b)
Description : In the human anatomy, eggs and Sperm are a form of which of the followingA.Asexual reproduction B.Sexual reproduction C.GametesD.Somatic cells?
Last Answer : The answer is C. Gametes
Description : How many germ cells mate in sexual reproduction ?
Last Answer : Sexual reproduction involves the union of 2 germ cells
Last Answer : 2 types of plant germ cells.
Description : $ Meiosis is a requirements of sexual reproduction. ! Meiosis occurs in somatic cells.
Last Answer : $ Meiosis is a requirements of sexual reproduction. ! Meiosis occurs in somatic cells. A. If both As and R ... is wrong D. If both As and R are wrong.
Description : What is the type of reproduction that occurs in roundworms? What typical feature do nematode sperm cells have?
Last Answer : Nematodes reproduce sexually. The nematode sperm cell does not have cilia nor flagella and they move by amoeboid movement forming pseudopods.
Description : Sexual reproduction involving fusion of two cells in Chlamydomonas is (a) isogamy (b) homogamy (c) somatogamy (d) hologamy.
Last Answer : (d) hologamy.
Description : Reproduction in bacterial cells occurs by the sequence of events known as _____. a. mitosis b. binary fission c. selfing d. budding
Last Answer : b. binary fission
Description : The aim of genomic medicine is a) improving predictions about individuals' susceptibility to diseases Predictions regarding the time of their onset, their extent and eventual severity as well as which ... broader than the cure of disease. d) cloning Genomic medicine is gene-based health care.
Last Answer : a) improving predictions about individuals’ susceptibility to diseases Predictions regarding the time of their onset, their extent and eventual severity as well as which treatments or medications are likely to be most effective or harmful are the focus of genomic medicine.
Description : A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution? (a) Blue (b) Green (c) Yellow (d) Red
Last Answer : (a) Blue
Description : Read the following statements (A - E) and answer the question which follows them. (A) In liverworts, mosses and ferns gametophytes are free-living. (B) Gymnosperms and some ferns are heterosporous. (C) Sexual ... How many of the above statements are correct? (a) Three (b) Four (c) One (d) Two
Last Answer : (a) Three
Description : In Exo-biology we study about- (a) External structure of living beings (b) Life present on the earth (c) Life present in the other layer of earth atmosphere (d) Life found in space and on other setallite.
Last Answer : (d) Life found in space and on other setallite.
Description : reproduction would not occur if which part of the cell was removed?
Last Answer : The Cell Membrane
Description : $ DNA contains all the neccesary information and instructions for cell reproduction Reproduction is not essential for the living organisms.
Last Answer : $ DNA contains all the neccesary information and instructions for cell reproduction Reproduction is not essential ... . If both As and R are wrong.
Description : What process by which the egg cell and sperm cell unite during sexual reproduction?
Last Answer : The process is known as fertilisation (or fertilization in American English)
Description : Which of the following property (ies) of the cell are equated with the life: D A. Growth B. Reproduction C. Metabolism D. All of the these
Last Answer : All of the these
Description : The properties of cell that are equated with those of life includes. a. Growth b. Reproduction c. Metabolism d. all
Last Answer : all
Description : The cell reproduction in bacteria may occur by A.binary fission B.budding C.fragmentation D.all of these
Last Answer : D.all of these
Description : The inward pinching to the cell envelope in reproduction is called a. Binary fission b. Cytokinesis c. Mitosis d. Asexual reproduction
Last Answer : b. Cytokinesis
Description : Which one of the following statements does NOT apply to bacterial reproduction? a. A fission ring apparatus is present. b. Septum formation occurs. c. A spindle apparatus is used. d. Symmetrical cell division occurs.
Last Answer : c. A spindle apparatus is used.
Description : What is the function of the cell envelope? a. growth and reproduction b. protection from osmotic pressure c. sensing and responding to the environment d. acquiring nutrients
Last Answer : b. protection from osmotic pressure
Description : What Structure in both plant and yeast cells but not in bacteria cell?
Last Answer : cellular
Description : Which is correct about cell theory in view of current status of our knowledge about cell structure? (a) It needs modification due to discovery of subcellular structures like chloroplasts and ... Cell theory means that all living objects consists of cells whether or not capable of reproducing
Last Answer : (c) Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation.
Description : Match the following cell structure with its characteristic feature. (A) Tight junctions (i) Cement neighbouring cells together to form sheet (B) Adhering junctions (ii) Transmit information through chemical to another cells (C) Gap ... iii) (c) (iii) (i) (iv) (ii) (d) (iv) (iii) (i) (ii)
Last Answer : (c) (iii) (i) (iv) (ii)
Description : Which one of the following is NOT true of exotoxins? a. They are proteins. b. They are part of cell wall structure. c. They are released from live bacterial cells. d. They trigger antibody production.
Last Answer : d. They trigger antibody production.
Description : The branch of biology dealing with the study of cells is known as - (1) Cytology (2) Histology (3) Psychology (4) Physiology
Last Answer : (1) Cytology Explanation: Cytology means "the study of cells". Cytology is that branch of life science, which deals with the study of cells in terms of structure, function and chemistry. ... diagnosis of disease; and Cell biology: the study of (normal) cellular anatomy, function and chemistry.
Description : The branch of biology dealing with the study of cells is known as (1) Cytology (2) Histology (3) Psychology (4) Physiology
Last Answer : Cytology
Description : Distinguish between a gamete and zygote. Explain their roles in sexual reproduction -Biology
Last Answer : Gamete represents the sex cell or germ cell in sexual reproduction. ... Zygote is the product of fertilization in which a male and a female gamete fuse with each other. The two fusing ... characters of their parents in their DNA. Fertilization brings characters of both parents into one zygote cell.
Description : Give two reasons for the appearance of variations among the progeny formed by sexual reproduction. -Biology
Last Answer : Now, the two major reasons for appearance of variation among the progeny formed from sexual reproduction are; crossing over in which the DNA gets exchanged between the homologous chromosomes during the meiosis that causes variation in the offspring.
Description : What is the importance of DNA copying in reproduction? -Biology
Last Answer : DNA copying has following importance in reproduction: It maintains the characteristics of species. It maintains the continuity of life. From this, the characteristics and features of organisms are ... progeny. It produces variations in organisms which is the basis of evolution of new species.
Description : What are the two types of Reproduction? -Biology
Last Answer : There are two types of reproduction: asexual and sexual reproduction. Though asexual reproduction is faster and more energy efficient, sexual reproduction better promotes genetic diversity through new combinations of alleles during meiosis and fertilization.
Description : Why is reproduction essential for organisms? -Biology
Last Answer : answer:
Description : Why is vegetative reproduction also considered as a type of asexual reproduction? -Biology
Description : Distinguish between asexual and sexual reproduction. -Biology
Description : Explain reproduction in algae. -Biology
Description : Explain sexual reproduction in bacteria. -Biology
Description : Difference between Sexual and Asexual reproduction in plants? -Biology