24277 + Interview Questions in Biology in Class 12 Page 409 InterviewSolution

20401.	Question : Describe five types of leucocytesm,with the help of diagrames,Add a note on their functions.
Answer» Solution :(1) Leucocytes or White Blood Corpuscles (WBCs) are colouroess, nucleated, amoeboid and phagocytic cells. (2) Their size ranges between 8 to 15 `mu`m. Total WBC count is 5000 to 9000 WBCs/cu mm of blood. The average life spam of a WBC is about 3 to 4 days. (3) They are formed by leucopoiesis in red bone marrow, spleen, lymph nodes, tonsils, thymus and Payer's patches, whereas the dead WBCs are destroyed by PHAGOCYTOSIS in blood, liver and lymph nodes. (4) Leucocytes are mainly divided into two types, viz., granulocytes and agranulocytes. (5) Granulocytes : Granulocytes are cells with granular cytoplasm and lobed nucleus. Based on their staining properties and shape of nucleus, they are of three types, viz. neutrophils, eosinopohils and basopohils. (I) Neutropohils : (i) In neutrophils, the cytoplasmicgranules take up neutral stains. (ii) Their nucleus is three to five lobed. (III ) It may undergo changes in structure hence they are called polymorphonuclear lelucocytes or polymorphs. (iv) neutrophilsare about `70%` of total WBCs. (v) They are phagocytic in function and engulf microorganisms. (II) Ecosinophils or acidophils : (i) Cytoplasmic granules of eosinophils take up acidic dyes such as eosin. They have bilobed nucleus. (ii) Ecosinopohils are about `3%` of total WBCs. (iii) They are non-phagocyticin nature. (iv) Their NUMBER increases (i.e. eosinophilia )during allergic CONDITIONS. (v) They have anti-histamine propertiy. (III) Basophils : (i) The cytoplasmic granules of basophils take up basic stains such as methylene blue. (ii) They have twisted nucleus. (iii) In size, they are smallest and constitute about `0.5%` of total WBCs. (iv) They too are non-phagocytic. (v) Their function is to release heparin which acts as an anticoagulant and histamine that is involved in inflammatory and allergic reaction. (6) Agranulocytes : There are two typesof agranulocytes, viz. monocytes and lymphocytes. Agranulocytes do not show cytoplasmicgranulesand their nucleus is not lobed. They are of two types, viz.lymphocytes. and monocytes. (I) Lymphocytes : (i) Agranulocyte with a large round nucleus is called lymphocyte. (ii) They are about `30%` of total WBCs. (iii) Agranulocytes are responsible for immune response of thebody by producing antibodies. (III) Monocuytes : (i) Largest of all WBCs having large kidney shaped nucleus are monocytes. They are about `5%` of total WBCs. (ii) They are phagocytic in function. (iii) They can differentiate into macrophages for engulfing micro-organisms and removing cell debris. Hence they are also called scavengers. (iv) At the site of infections they are seen in more enlarged form.

Discussion

20402.	Question : Blood clotting out of liver has high concentration of:
Answer» Urea Proteins Oxygen Erythrocytes Answer :A

Discussion

20403.	Question : Blood clotting in a test tube can be prevented by adding a little of :
Answer» SODIUM oxalate Sodium chloride Sodium hydroxide Ammonium chloride Answer :A

Discussion

20404.	Question : Blood analysis of a patient reveals an usually high uantity of carboxyhaemoglobin content.Which of the following conclusions is most likely to be correct ? The patient has been inhaling polluted air containingunusually high content of :
Answer» Chloroform Carbon dioxide Carbon monoxide Carbon disulphide Answer :C

Discussion

20405.	Question : Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. The patient most likely has been inhaling polluted air containing unusually high content of
Answer» CARBON disulphide chloroform carbon dioxide carbon monoxide Answer :D

Discussion

20406.	Question : Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct ?
Answer» CARBON disulphide Chloroform Carbon dioxide Carbon monoxide Answer :D

Discussion

20407.	Question : Blindness is prevented by use to which crop in poor countries?
Answer» Wheat Flavr Savr Golden rice Pea Answer :C

Discussion

20408.	Question : Blindness prevented by use of which crop in poor country?
Answer» GOLDEN rice Wheat Maize Oat Answer :A

Discussion

20409.	Question :Blindness is prevented by use of this crop in poor countries
Answer» GOLDEN rice Wheat Gram Pea ANSWER :A

Discussion

20410.	Question : Blind spot in an eye is part where
Answer» VISUAL acuity is great cones are densely PACKED neither cones nor rods are present rods are densely packed Answer :C

Discussion

20411.	Question : Blind spot has .
Answer» CONES but no RODS Rods but no cones No rods and cones Cones and rods Answer :C

Discussion

20412.	Question : Blastulation starts in the ………… .
Answer» ovaries fallopian tubes uterus vagina Answer :C

Discussion

20413.	Question : Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason ?
Answer» Solution :Blends of polyblend and bitumen, when is used to lay ROADS, ENHANCED the bitumen.s water repellant properties, hence helped to increase road life by a FACTOR of THREE.

Discussion

20414.	Question : Blastula of frog has:
Answer» BLASTOPORE Blastocoel Archenteron Gastropore ANSWER :B

Discussion

20415.	Question : Blastula and Gastrula.
Answer» SOLUTION :

Discussion

20416.	Question : Blastopore is the pore of
Answer» archenteron blastocoel coelom alimentary canal Answer :A

Discussion

20417.	Question : Blastopore is the opening to the exterior of
Answer» COELOM COELENTERON Archenteron Blastocoel ANSWER :C

Discussion

20418.	Question : Blastocoek, used as yolk space in other vertebrates, possesses in mammals
Answer» yolk fat reserve outer CELL mass trophectoderm Answer :B

Discussion

20419.	Question : Blackman's law of limiting factor is the modification of _____law of minimum.
Answer» ANSWER :Liebig's

Discussion

20420.	Question : Blackening of urine when exposed to air is a metabolic disorder in human beings. This is due to
Answer» phenylalanine tyrosine valine REPLACING glutamine homogentisic ACID

Discussion

20421.	Question : Black man's law of limiting factor is applicable to
Answer» only PHOTOSYNTHESIS only RESPIRATION only PHYSICAL process any BIOCHEMICAL process Answer :D

Discussion

20422.	Question : Black lung disease is common in :
Answer» Farmers Workers of PETROCHEMICAL industries Coal miners Refinery workers Answer :C

Discussion

20423.	Question : Black foot disease occurs due to :-
Answer» Cadmium Mercury Arsenic Copper Answer :C

Discussion

20424.	Question : Black Buck is not allowed to be hunted by which of the following communities?
Answer» Bishnois Bhils Ahirs Jats Answer :A

Discussion

20425.	Question : Black buck is a bird.
Answer» ANSWER :MAMMAL

Discussion

20426.	Question :Bite of Anopheles mosquito causes the rupture of RBCs and release a toxic substance called as
Answer» SAXITOXIN AFLATOXIN haemozoin none of the above Answer :C

Discussion

20427.	Question : Birth hormone.
Answer» Solution :(1)Birth hormone or OXYTOCIN helps in parturition.(2)It is a powerful STIMULANT of contraction of uterine myometrium at the end of gestation due to which the labour is initiated.(3)It also STIMULATES myoepithelial cells of mammary glands for milk EJECTION during lactation.(4)It also helps in fertilization by p,owerful contractions of the uterine musculature to drive the sperms upward towards fallopian tubes.(5)Oxytocin also excites musculature of gall bladder,ureters, urinary bladder,intestine,etc,for PROPER functioning of these organs

Discussion

20428.	Question : Birds reared for the egg production called as:-
Answer» Broiler Aseel Culling Layers Answer :D

Discussion

20429.	Question : Birds like Flamingos can stand on one leg. Which among the followingstatements relatingto this is/arecorrect? 1. By standingon one leg Flamingos can conserve bodyheat and energybecausethey canreduce great deal of surfacearea for theloss of heat. 2. By standingon one leg, oneFlamingomakes acourtship display, whichis a part of ritual prior to reproduction. Selectthe correctanswer using the code given below :
Answer» 1 only 2 only Both 1 and 2 Neither1 nor 2 SOLUTION :Flamingos standon one leg to conserve body heat & ENERGY. The courtship displayof Flamingo includesraising NECK,followedby callingwith HEAD flagging & then WING flapping.

Discussion

20430.	Question : Birds excrete mainly urea.
Answer» True False Answer :UREA ACID

Discussion

20431.	Question : Birds differ from reptiles in
Answer» Being endothermic Being ectothermic both Being viviparous Answer :A

Discussion

20432.	Question : Birds differ from nonchordates due to presence of
Answer» TRUE COELOM BILATERAL symmetry Feathery wings Deuterostomic BODY plan Answer :C

Discussion

20433.	Question : Birds characterised by phylum_______.
Answer» ANSWER :CHORDATA,

Discussion

20434.	Question : Birds are
Answer» Poikilothermic Ectothermic Cold blooded Endothermic Answer :D

Discussion

20435.	Question : Birds are not charectarised by
Answer» Feathers Jaws MODIFIED into beak warm blooded only viviparous Answer :D

Discussion

20436.	Question : Birds are glorified reptiles. Justify the statement.
Answer» Solution :Features of ARCHAEOPTERYX. a. PRESENCE of beak (like birds) and teeth (like REPTILES). B. Presence of WINGS (like birds) and clawed digits (like reptiles). c. Presence of feathers (like birds) and scales (like reptiles). d. Presence of feathery tail (like birds) and tail vertebrae (like reptiles).

Discussion

20437.	Question : Bird flu caused by
Answer» H1N1 H5N1 H3N1 H2N1 Answer :B

Discussion

20438.	Question : Birbal Sahni Institute of Palaeobotany is situated in :
Answer» Allahabad Himachal Pradesh Lucknow Meerut Answer :C

Discussion

20439.	Question : Bipolar neurons are found in ……………
Answer» Olfactory epithelium Retina of eye Both (1) & (2) DORSAL root ganglion of SPINAL cord Answer :C

Discussion

20440.	Question : biotic potential of human female is
Answer» `471` `481` `491` `461` ANSWER :B

Discussion

20441.	Question : Biotic potential refers to :-
Answer» Increase of POPULATION under optimum conditions Increase of population under GIVEN conditions Increase of population under NATURAL conditions Increase of population under CLIMATIC conditions Answer :A

Discussion

20442.	Question : Biotic potential is the intrinsic rate of natural increase but is not allowed by environmental resistance.
Answer» ANSWER :TRUE

Discussion

20443.	Question : Biotic community is
Answer» Static DYNAMIC GROUP of POPULATION of same species in a GIVEN area All of the above SOLUTION :Dynamic

Discussion

20444.	Question : Biotechnology is a necessary evil' was the topic in a seminar. Suppose you are a speaker, how will you present the theme?
Answer» Solution :Biotechnology is one of those difficult TERMS that can mean differ ent things to different people. Biotechnology is a multidisciplinary branch incorporating Biological and TECHNOLOGICAL innovation for the BENEFIT of human kind. In essence, it is the use of an organism (usually a microorganism) or a biologically derived substance (usually an EN zyme) in a production or conversion process. Thus brewing and wine making, food processing and manufacture, the production of pharma ceuticals and even the treatment of sewage can all be classified as different aspects of biotechnology. Modern biotechnology is often asso ciated with the use of genetically modified system. The products of biotechnological processes are destined for use in a variety of fields such as medicine, agriculture and scientific research. Industrial revolution modernised Europe and bypassed the third world countries. Biotechnology revolution too seems to become a mo nopoly of the economically prosperous and technically advanced coun tries of the North. One danger is that some of the profit-motive agro business firms in these countries are making use of biotechnological TECHNIQUES to make high breeding varieties of seeds suitable for a particular type of fertilizer and pesticide, thus linking the sale of seeds with the sale of the fertilizer and pesticide. It is feared that advances in biotechnology will enable multination al companies to have more control over the genetic resources of the third world which have the largest gene pool in the world.

Discussion

20445.	Question : Biotechnology deals with the techniques of using the organisms or enzymes from to produce the products and processes useful to human. Mention the key tools in biotechnology.
Answer» SOLUTION :(i) Resriction enzymes (ii) Plymerase ENZYME (iii) Ligases (iv) HOST (v) VECTORS

Discussion

20446.	Question : Biotechnology in agriculture will lead to pest resistant plants,which could decreas the amount of pesticides used. For example Bt cotton. Expand the letter 'B' and 't'.
Answer» SOLUTION :B - BACILLUS t - thuringiensis

Discussion

20447.	Question : Biotechnology helps in synthesizing
Answer» New GENERATION ANTIBIOTICS New VACCINES GMO All of these Solution :All of these

Discussion

20448.	Question : Biotechnology deals with techniques of using live organisms or enzymes from organisms to prodice products useful to humans . Explain briefly the two core techniques that enabled the birth of modern biotechnology
Answer» Solution :i. GENETIC engineering : It is the technique used to ALTER the chemistre of genetic material to introduce it into host orgaism and thus change the phenotype of the host ii.Maintenance of STERILE ambience: in chemical engineering processes to enable the GROWTH of only desired cell or microbes,

Discussion

20449.	Question : Biotechnology can also be used in developing(A) Bioweapons(B) Highly infectious pathogens(C) Disease resistant pathogen with marked virulence(D) All of the above
Answer» BIOWEAPONS Highly INFECTIOUS PATHOGENS Disease resistant pathogens with MARKED virulence All the above Solution :All the above

Discussion

20450.	Question : Biotechnolgy mainly uses
Answer» GMO BACTERIA VIRUS ANIMALS SOLUTION :GMO

Discussion

Explore topic-wise InterviewSolutions in .

Question : Describe five types of leucocytesm,with the help of diagrames,Add a note on their functions.

Question : Blood clotting out of liver has high concentration of:

Question : Blood clotting in a test tube can be prevented by adding a little of :

Question : Blood analysis of a patient reveals an usually high uantity of carboxyhaemoglobin content.Which of the following conclusions is most likely to be correct ? The patient has been inhaling polluted air containingunusually high content of :

Question : Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. The patient most likely has been inhaling polluted air containing unusually high content of

Question : Blood analysis of a patient reveals an unusually high quantity of carboxyhaemo­globin content. Which of the following conclusions is most likely to be correct ?

Question : Blindness is prevented by use to which crop in poor countries?

Question : Blindness prevented by use of which crop in poor country?

Question :Blindness is prevented by use of this crop in poor countries

Question : Blind spot in an eye is part where

Question : Blind spot has .

Question : Blastulation starts in the ………… .

Question : Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason ?

Question : Blastula of frog has:

Question : Blastula and Gastrula.

Question : Blastopore is the pore of

Question : Blastopore is the opening to the exterior of

Question : Blastocoek, used as yolk space in other vertebrates, possesses in mammals

Question : Blackman's law of limiting factor is the modification of _____law of minimum.

Question : Blackening of urine when exposed to air is a metabolic disorder in human beings. This is due to

Question : Black man's law of limiting factor is applicable to

Question : Black lung disease is common in :

Question : Black foot disease occurs due to :-

Question : Black Buck is not allowed to be hunted by which of the following communities?

Question : Black buck is a bird.

Question :Bite of Anopheles mosquito causes the rupture of RBCs and release a toxic substance called as

Question : Birth hormone.

Question : Birds reared for the egg production called as:-

Question : Birds excrete mainly urea.

Question : Birds differ from reptiles in

Question : Birds differ from nonchordates due to presence of

Question : Birds characterised by phylum_______.

Question : Birds are

Question : Birds are not charectarised by

Question : Birds are glorified reptiles. Justify the statement.

Question : Bird flu caused by

Question : Birbal Sahni Institute of Palaeobotany is situated in :

Question : Bipolar neurons are found in ……………

Question : biotic potential of human female is

Question : Biotic potential refers to :-

Question : Biotic potential is the intrinsic rate of natural increase but is not allowed by environmental resistance.

Question : Biotic community is

Question : Biotechnology is a necessary evil' was the topic in a seminar. Suppose you are a speaker, how will you present the theme?

Question : Biotechnology deals with the techniques of using the organisms or enzymes from to produce the products and processes useful to human. Mention the key tools in biotechnology.

Question : Biotechnology in agriculture will lead to pest resistant plants,which could decreas the amount of pesticides used. For example Bt cotton. Expand the letter 'B' and 't'.

Question : Biotechnology helps in synthesizing

Question : Biotechnology deals with techniques of using live organisms or enzymes from organisms to prodice products useful to humans . Explain briefly the two core techniques that enabled the birth of modern biotechnology

Question : Biotechnology can also be used in developing(A) Bioweapons(B) Highly infectious pathogens(C) Disease resistant pathogen with marked virulence(D) All of the above

Question : Biotechnolgy mainly uses

Question : Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct ?