Description : A change in the amount of yolk and its distribution in the egg will affect (a) pattern of cleavage (b) number of blastomeres produced (c) fertilisation (d) formation of zygote.
Last Answer : a) pattern of cleavage
Description : Extrusion of second polar body from egg occurs (a) simultaneously with first cleavage (b) after entry of sperm but before fertilisation (c) after fertilisation (d) before entry of sperm into ovum.
Last Answer : (b) after entry of sperm but before fertilisation
Description : Which cell division is found during cleavage ?
Last Answer : Which cell division is found during cleavage ? A. Amitosis B. Mitosis C. Closed mitosis D. Meiosis
Description : Cleavage divisions differ from normal mitotic divisions in that: (a) There is no nuclear division during cleavage (b) There is no division of cytoplasm during cleavage (c) The division of cytoplasm follows nuclear division (d) There is no period of growth in between divisions
Last Answer : Ans:(d)
Description : During cleavage, what is true about cells? (a) Nucleocytoplasmic ratio remains unchanged. (b) Size does not increase. (c) There is less consumption of oxygen. (d) The division is like meiosis.
Last Answer : b) Size does not increase.
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 : What is the effect called, where a word loses all its meaning, when repeated over and over in rapid succession?
Last Answer : A platitude? Or baloney bologna.
Description : A test method of comparing two audio systems by switching inputs so that the same recording is heard in rapid succession over one given system and then the other. A. B test B. A test C. AB test D. C test
Last Answer : C. AB test
Description : What visual technique should be used when searching for an aircraft? a. Sweep from side to side with the eyes covering the whole field of vision b. Search the sky portion by portion starting ... the sky and confirm before passing onto another d. Use a succession of small and rapid eye movements
Last Answer : c. Pinpoint 10° segments of the sky and confirm before passing onto another
Description : Meroblastic cleavage is division.
Last Answer : Meroblastic cleavage is division. A. Horizontal B. Partial/parietal C. Total D. Spiral
Description : The mitotic division starts as the zygioge moves through the of the oviduct called cleavage.
Last Answer : The mitotic division starts as the zygioge moves through the of the oviduct called cleavage. A. Ampulla B. Isthmus C. Fimbriae D. Infiundibulum
Description : Meroblastic cleavage is division
Last Answer : Meroblastic cleavage is division A. Horizontal B. Partial/parietal C. Total D. Spiral
Description : (i) Mention the event that induces the completion of the meiotic division of the secondary oocyte. (ii) Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo. -Biology
Last Answer : (i)Secondary oocyte completes meiosis-ll only when a sperm enters its cytoplasm. It forms a larger cell, the ootid and a small cell, the second polar body. (ii)The secondary oocyte is ... and inner cell mass.The trophoblast attacheds to endometrium (implantation) and blastocyst gets embedded in it.
Description : A succession that does not follow the natural course due to human activity is
Last Answer : A succession that does not follow the natural course due to human activity is A. Subsere B. plagiosere C. prisere D. asere.
Description : Cancerous cells can easily be destroyed by radiations due to (a) rapid cell division (b) lack of nutrition (c) fast mutation (d) lack of oxygen
Last Answer : (a) rapid cell division
Description : The duration 19-21 days refers to: (1) incubation period of hen's egg (2) average life-span of a red blood cell in humans (3) the period of menstrual cycle soon after menstruation, during ... to occur (4) period of completion of one schizogony cycle of malarial parasite inside a red blood cell
Last Answer : (3) the period of menstrual cy-cle soon after menstruation, during which fertilisation is most likely to occur Explanation: The menstrual cycle is the scientific term for the physiological changes ... 21 days or more between a woman's shortest and longest cycle lengths is considered very irregular
Last Answer : the period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur
Description : Solid ball of cell produced by repeated cleavage is called
Last Answer : Solid ball of cell produced by repeated cleavage is called A. Gastrula B. Blastula C. Morula D. Neurula
Description : Assertion : Nucleocytoplasmic ratio decreases in cleavage . Reason : During cleavage , cytoplasmic synthesis is faster than DNA synthesis.
Last Answer : Assertion : Nucleocytoplasmic ratio decreases in cleavage . Reason : During cleavage , cytoplasmic synthesis ... If both Assertion & Reason are False.
Description : During cleavage , what is true about embryo ?
Last Answer : During cleavage , what is true about embryo ? A. Nucleocytoplasmic ratio remains unchanged B. Sizes ... of oxygen D. The division is like meiosis.
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 : In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube? (a) Embryo only, upto 8 cell stage (b) Either zygote or early embryo upto 8 cell stage (c) Embryo of 32 cell stage (d) Zygote only
Last Answer : (b) Either zygote or early embryo upto 8 cell stage
Description : A childless couple can be assisted to have a child through a technique called GIFT. The full form of this technique is (a) Gamete Internal Fertilisation and Transfer (b) Germ cell Internal Fallopian Transfer (c) Gamete Inseminated Fallopian Transfer (d) Gamete Intra Fallopian Transfer.
Last Answer : (d) Gamete Intra Fallopian Transfer.
Description : Which one of the following statements regarding post-fertilisation development in flowering plants is incorrect? (a) Ovules develop into embryo sac. (b) Ovary develops into fruit. (c) Zygote develops into embryo. (d) Central cell develops into endosperm
Last Answer : (a) Ovules develop into embryo sac.
Description : Which one of the following statements is wrong? (a) When pollen is shed at two-celled stage, double fertilisation does not take place. (b) Vegetative cell is larger than generative cell. (c) Pollen grains in some plants remain viable for months. (d) Intine is made up of cellulose and pectin.
Last Answer : (a) When pollen is shed at two-celled stage, double fertilisation does not take place.
Description : Explain the events that occur during fertilisation of an ovum in humans. How is it that only one sperm enters the OVUm? -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 ... that blocks the entry of additional sperms. This ensures that only one sperm can fertilise an ovum
Description : Where does fertilisation occur in humans? Explain the events that occur during this process. -Biology
Last Answer : 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: (i) The sperm reaches the junction of ampulla ... and second polar body. (iv)Nucleus of sperm and of ovum fuses to form a diploid zygote.
Description : How is the entry of only one sperm ensured into an ovum during fertilisation in humans? -Biology
Last Answer : During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes (depolarisation) in the membrane that blocks the entry of additional sperms. This ensures that only one sperm can fertilise an ovum
Description : Assertion : From day 10 to 17 of the mentrual cycle is called fertile period. Reason : As chances of fertilisation are very high during this period.
Last Answer : Assertion : From day 10 to 17 of the mentrual cycle is called fertile period. Reason : As chances of ... . D. If both Assertion & Reason are False.
Description : What happens during fertilisation in humans after many sperms reach close to the ovum? (a) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida. (b) All sperms except ... all the sperms except one. (d) Only two sperms nearest the ovum penetrate zona pellucida.
Last Answer : (a) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.
Description : Endosperm is formed during the double fertilisation by (a) two polar nuclei and one male gamete (b) one polar nuclei and one male gamete (c) ovum and male gamete (d) two polar nuclei and two male gametes.
Last Answer : (a) two polar nuclei and one male gamete
Description : Which of the following statement about reproductions in human is correct. a) fertilisation takes place externally b) fertilisation takes place in the testes c) during fertilisation egg moves towards sperm d) fertilisation takes place in human female
Last Answer : d) fertilisation takes place in human female
Description : (a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.
Last Answer : ANS (a) (i) OVARY (ii) FALLOPIAN TUBE (iii) AMPULLA-ISTHAMUS JUNCTION OF FALLOPIAN TUBE (iv) ENDOMETRIUM LINING OF UTERUS (b) HUMAN CHORIONIC GONADOTROPIN AND HUMAN PLACENTAL LACTOGEN
Description : During ecological succession:
Last Answer : During ecological succession: A. the changes lead to a community that is in near equi- librium ... D. the number and types of animals remain constant
Description : Stable plant community formed during succession is called:-
Last Answer : Stable plant community formed during succession is called:- A. Sere community B. Climax community C. Dominant community D. Ecotone
Description : During ecological succession (a) the numbers and types of animals remain constant (b) the changes lead to a community that is in near equilibrium with the environment and is called pioneer community ( ... area (d) the establishment of a new biotic community is very fast in its primary phase.
Last Answer : (c) the gradual and predictable change in species composition occurs in a given area
Description : Q6. During the process of ecological succession the changes that take place in communities are a. Orderly and sequential b. Random c. Very quick d. Not influenced by the physical environment.
Last Answer : 6. (a) orderly and sequential
Description : Men, is cleavage in the workplace really distracting?
Last Answer : If you wear low-cat tops to the office, you are saying, “Don’t take me seriously.” Keep the personal fashion statements for your own time.
Description : Cleavage : Am I supposed to look or not?
Last Answer : Your eyes are yours; you can do whatever you want with them. If you are challenged, be nice and charming while explaining that you’re a human male. What else would the cleavage bearer expect.
Description : How come women can show cleavage but I can't show part of my testicles?
Last Answer : Uh, that’s immoral, It’s sounds similar to the question Wrestle asked, and anyway, I might get flagged but uh last I looked…. womens breasts don’t have hair
Description : What is Cleavage ?
Last Answer : The division of fertilized eggs is called cleavage
Last Answer : No! It's repulsive to me.
Description : Deuterostome condition and indeterminate radial cleavage are characteristics of
Last Answer : Deuterostome condition and indeterminate radial cleavage are characteristics of A. Chordates and ... D. Chordates, arthropods, and annelids
Description : a. The egg of is moderately telolecithal b. Sooner or later the cleavage pattern becomes irregular
Last Answer : a. The egg of is moderately telolecithal b. Sooner or later the cleavage pattern becomes irregular A. ... D. Both the statements a and b are correct.
Description : In humans, cleavage divisions are
Last Answer : In humans, cleavage divisions are A. Slow and synchronous B. Slow and asynchronous C. Fast and synchronous D. Fast and asynchronous.
Description : Due to presence of large amount of yolk. Zygote divides into two incomplete halv es. This type of cleavage does not occur in
Last Answer : Due to presence of large amount of yolk. Zygote divides into two incomplete halv es. This ... of three germinal layers D. Formation of archenteron.
Description : A zygote is completely divided into two by a cleavage furrow. The cleavage type is
Last Answer : A zygote is completely divided into two by a cleavage furrow. The cleavage type is A. Equatorial B. Meroblastic C. Radial D. Holoblastic.