24277 + Interview Questions in Biology in Class 12 Page 221 InterviewSolution

11001.	Question : One of the methods by which recombinant DNA can be introduced into host cell is by 'heat shock' treatment (electro-poration). Write down other three important methods by which we can introduce alien DNA into host cells .
Answer» Solution :i. Micro-injection : Recombinant DNA is DIRECTLY injected into the nucleusof animal cell. ii. Biolistics or gene gun : Cells are bombarded with high velocity microparticles of gold or tungsten coated with DNA. iii.By disarmedpathogen vectors :These vectors are allowed to INFACT the cell, which TRANSFERS the recombinant DNA into the host .

Discussion

11002.	Question : One of the main objective of biotechnology is to minim.ise the use of insecticides on cultivated crops. Explain with the help of a suitable example how insect resistant crops have been developed using techniques of biotechnology.
Answer» Solution : By using the techniques of biotechnology, Insect RESISTANT crops have been developed. Some strain of Bacillus thuringiensis (Bt) produce protein crystals which contain a toxic insecticidal protein that kill some insects like lepidopterans, coleopterans and DIPTERANS, etc. Specific Bt toxin genes were isolated from Bacillus thuringiensis and CLONED in bacteria. Specific_ Bt toxin genes obatained from Bacillus thuringiensis are used in several crop plants like cotton by providing them resistance from insects. Bt toxins arinsect-group specific, coded by a GENE called cry which are of various types. PROTEINS encoded by the genes cry IAc and cry IIAb control the cotton boll worms, that of cryIAb controls corn borer.

Discussion

11003.	Question : One of the major difficulties in the biological control of insect pest is that
Answer» the METHOD is LESS effective as compared with the us of insecticides the predator does not always survive when transferred to a NEW environment the predator DEVELOPS a preference to other diets may itself become a pest the PRACTICAL difficulty of introducing the predat specific area. Answer :C

Discussion

11004.	Question : One of the legal methods of birth control is :
Answer» by abstaining from coitus from DAY 10 to 17 days of the menstrual cycle by having coitus at the TIME of daybreak by a premature ejaculation during coitus abortion by taking an APPROPRIATE medicine . ANSWER :D

Discussion

11005.	Question : One of the key factors, which makes the plasmid the vector in genetic engineering is that
Answer» It is RESISTANT to antibiotics It resistant to restriction enzymes Its ability to CARRY a FOREIGN GENE Its ability to cause INFECTION in the host Solution :Its ability to carry a foreign gene

Discussion

11006.	Question : One of the important consequences of geographical isolation is
Answer» PREVENTING speciation speciation through reproductive isolation random creation of new species no change in the ISOLATED FAUNA. Solution : speciation through reproductive isolation

Discussion

11007.	Question : one of the legal method of birth control is
Answer» by having coitus at the TIME of day BREAK by a premature ejaculation during coitus ABORTION by taking an APPROPRIATE medicine by ABSTAINING from coitus from day 10 to 17 of menstrual cycle Answer :D

Discussion

11008.	Question : One of the gnes present exclusively in the X - chromosome in himans is concerned with
Answer» BALDNESS Red-green colour blindness Facial HAIR/ moustaches in MALES Night blindness ANSWER :B

Discussion

11009.	Question : One of theimportant consequence ofgeographical isolation is :
Answer» Random creatio of newspecies No CHANGEIN the isolated FAUNA Preventingspeciation SPECIATION through REPRODUCTIVEISOLATION . Answer :D

Discussion

11010.	Question : One of the free nitrogen - fixed in paddy fields is :
Answer» BEIJERNICKIA Rhodospirillum RHIZOBIUM Azotobacter ANSWER :B

Discussion

11011.	Question : One of the genes present exclusively on the X-chromosome in humans is concerned with
Answer» BALDNESS red-green COLOUR BLINDNESS facial HAIR / MOUSTACHES in males night blindness Solution :red-green colour blindness

Discussion

11012.	Question : One of the following trait distinguishes hominids from apes
Answer» The USE of tools Walking upright Absence of TAIL Use of fire Answer :B

Discussion

11013.	Question : One of the following sugars cannot be found in honey.
Answer» levalose fructose & glucose sucrose NONE of above Solution : none of above

Discussion

11014.	Question : One of the following statements is correct
Answer» ASPARAGINE and GLUTAMINE are most important amino acids Asparagine and glutamine are transported to other parts of the plant via XYLEM vessels In soybean root nodules, the fixed nitrogen is imported as ureides. Ureides has high carbon to nitrogen ratio Answer :B

Discussion

11015.	Question : One of the following is true with respect to AUG.
Answer» it codes for methionine only it is also an initiation codon It codes for methionine in both PROKARYOTES and eukaryotes all of the above Answer :d

Discussion

11016.	Question :One of the following is true with respect to AUG :
Answer» It codes for METHIONINE only It is also an INITIATION codon It codes for methionine in both PROKARYOTES and eukaryotes All of the above Answer :D

Discussion

11017.	Question : One of the following is not true ?
Answer» A species is a collection of demes Deme is a group of population with common gene pool CHANGE in gene frequencies indicates EVOLUTION is not in progress . According to Hardy Weinberg's Principal , gene frequencies can remain constant if Mutations don't occur Answer :C

Discussion

11018.	Question : One of the following is not the characteristic feature of cyanobacteria:
Answer» They are MULTICELLULAR. They form colonies They form blooms in polluted water bodies They can FIX ATMOSPHERIC nitrogen. Answer :A

Discussion

11019.	Question : One of the following is not the kind of euploidy
Answer» DIPLOIDY POLYPLOIDY Hyperploidy AUTOPLOIDY ANSWER :C

Discussion

11020.	Question : One of the following is not a natural process
Answer» Transpiration Guttation Plasmolysis Imbibition Answer :C

Discussion

11021.	Question : One of the following is not a correct match
Answer» Potassium - root ROT of tomato Molybdenum - whiptail in cauliflower Zinc - WHITE BUD in mustard Boron - Water core in turnip Answer :C

Discussion

11022.	Question : One of the following is not a green house gas:
Answer» `CO_(2)` `CH_(4)` Ethane `N_(2)O` Answer :C

Discussion

11023.	Question : One of the following is neuropeptide hormone.
Answer» Insulin Glucagons Somatostatin Oxytocin Answer :D

Discussion

11024.	Question : One of the following is holandric inheritance
Answer» HAEMOPHILIA Epidermolysis WEBBED toes Turner's SYNDROME. Answer :C

Discussion

11025.	Question : One of the following is not a common disorder of the digestive system
Answer» Tetanus Diarrhoea Jaundice Dysentery ANSWER :A

Discussion

11026.	Question : One of the following is correct statement.
Answer» DOMINANT trait is EXPRESSED in homozygous CONDITION. Dominant trait cannot be expressed in heterozygous condition RECESSIVE trait can only be expressed in homozygous condition Recessive trait can always expressed in heterozygous condition Solution :Recessive trait can only be expressed in homozygous condition

Discussion

11027.	Question : One of the following is common in earthworm and cockroach
Answer» DOUBLE SOLID and VENTRAL NERVE cord Presence of nephridia Equal BODY segments Malpighian tubules Answer :A

Discussion

11028.	Question : One of the following is anucleate
Answer» SIEVE tube Companion CELL MEDULLARY ray All the above Answer :D

Discussion

11029.	Question : One of the following is correct statement
Answer» `T_(4)` is more active than `T_(3)` `T_(3)` is more active than `T_(4)` `T_(3)` and `T_(4)` are the same None of the above Answer :B

Discussion

11030.	Question : One of the following is an untrue statement
Answer» `Ca^(++)` is required by plants for cell division `K^(+)` never ENTERS into structural COMPOSITION of any compound in plants Copper is an activator for alcohol dehydrogenase Manganese toxicity in plants INHIBIT calcium translocation in shoot apex Answer :C

Discussion

11031.	Question : One of the following is an exotic breed of cattle
Answer» Jersey Leghorn Hisardale NONE of the above is a BREED of cattle Answer :A

Discussion

11032.	Question : One of the following is a very familiar beetle with red and black marking and is used to get rid of mosquitoes.
Answer» LADY bird Dragonflies Praying mantis Grasshopper Answer :A

Discussion

11033.	Question : One of the following is always negative for a plant cell
Answer» PRESSURE potential Osmotic potential Osmotic pressure 1 and 2 Answer :B

Discussion

11034.	Question : One of the following is a source of rubber
Answer» CEDRUS deodaro Tectono grandis HEVEA brasiliensis MICHELIA champaca. ANSWER :C

Discussion

11035.	Question : One of the following is a nitrogen-fixing enzyme
Answer» urease arginase nitrate all of these Answer :C

Discussion

11036.	Question : One of the following is a non essential element which counteract the toxicity of copper and stimulate plant growth
Answer» Silica Aluminium Sodium Nickel Answer :B

Discussion

11037.	Question : One of the following is a connecting link between protozoans and poriferans
Answer» cliona leucosolenia oscarella PROTEROSPONGIA Solution :Proterospongia is a coloniaol FLAGELLATE PROTOZOAN WHOSE eachcell resemblesa choanocyte of PORIFERA.

Discussion

11038.	Question :One of the following gesture of electron is useful to green plants in production of assimilatory power during photochemical reactions
Answer» FLUORESCENCE PHOSPHORESCENCE ENERGY transfer All the above Answer :C

Discussion

11039.	Question : One of the following excluded from deuterostomes
Answer» Chordate Echinodermata Annelida Cephalochordata Answer :C

Discussion

11040.	Question : One of the following elements is an activator of carbonic anhydrase.
Answer» Cu Zn Fe Mn Answer :B

Discussion

11041.	Question : One of the following character is not unique to phylum arthropoda
Answer» CHITINOUS exoskeleton Jointed appendages Malpighian TUBULES for excretion Closed TYPE of BLOOD VASCULAR system Answer :D

Discussion

11042.	Question : One of the following animal has no metamorphosis in its life cycle
Answer» Pheretima Asterias Musca Butterfly Answer :A

Discussion

11043.	Question : One of the critical mechanisms by which environment controls the population of a species is :
Answer» BIOTIC CONTROL Mortality FECUNDITY ENVIRONMENTAL resistance Answer :D

Discussion

11044.	Question : One of the examples of the action of the autonomous nervous system is :
Answer» Knee-jerk RESPONSE Pupillary reflex Peristalsis of the intestines DE Swallowing of food Answer :C

Discussion

11045.	Question : one of the examples of seeds in which the endosperm is completely consumed during embryo development is
Answer» Pea Maize Wheat Sunflower Answer :A

Discussion

11046.	Question : Oneof the commolyused plantgrowth hormoneis tea plantation is
Answer» ETHYLENE Abscisic acid Zeatin INDOLE - 3 - ACETIC acid ANSWER :D

Discussion

11047.	Question : One of the codons on mRNA is AUG. Draw the structure of tRNA adaptor molecule for this codon. Explain the uniqueness of this tRNA
Answer» Solution :This tRNA is SPECIFIC for METHIONINE. It ACTS as initiator tRNA.

Discussion

11048.	Question : One of the chief reasons among the following for the depletion in the number of species making endangered is ....
Answer» over HUNTING and poaching green house effect competition and predation HABITAT DESTRUCTION Solution :habitat destruction

Discussion

11049.	Question : One of the causes of variation known by early agriculturists, was hidden in
Answer» FORMATION of deploid gametes Fusion of IDENTICAL gametes sexual reproduction Both (1) & (2) Answer :C

Discussion

11050.	Question : One of the applications of biotechnology is the production of insect resistant crop plants, Justify the statement with referance to Bt. Cotton.
Answer» Solution :Crops are made which are more tolerant to environmnental stresses LIKE cold, heat drought, salt etc. BT. Cotton. a. Bacillus thuringensis produce crystal proteins called cry proteins which are toxic to larvae of insects like tobacco, budworm, army worm, bettles and mosquitoes. b. Cry protein exist as inactive prototoxin and gets converted into active toxin when ingested by the insects, as the alkaline pH of the gut solubilises the crystals. c. The activated toxin binds to the SURFACE of epithelial CELLS of midgut and creates pores. d. This causes swelling and LYSIS of cells leading to the death of the insects. e. The gene (cry genes) encoding this protein are isolated from the bacterium and incorporated into several crop plants like cotton, tomato, corn, rice, soyabean etc. f. The proteins encoded by the following cry genes control the pest given against them. i. crylAC and cryllAb it controls cotton bollworms. ii. crylAb controls corn borer.

Discussion

Explore topic-wise InterviewSolutions in .

Question : One of the methods by which recombinant DNA can be introduced into host cell is by 'heat shock' treatment (electro-poration). Write down other three important methods by which we can introduce alien DNA into host cells .

Question : One of the main objective of biotechnology is to minim.ise the use of insecticides on cultivated crops. Explain with the help of a suitable example how insect resistant crops have been developed using techniques of biotechnology.

Question : One of the major difficulties in the biological control of insect pest is that

Question : One of the legal methods of birth control is :

Question : One of the key factors, which makes the plasmid the vector in genetic engineering is that

Question : One of the important consequences of geographical isolation is

Question : one of the legal method of birth control is

Question : One of the gnes present exclusively in the X - chromosome in himans is concerned with

Question : One of theimportant consequence ofgeographical isolation is :

Question : One of the free nitrogen - fixed in paddy fields is :

Question : One of the genes present exclusively on the X-chromosome in humans is concerned with

Question : One of the following trait distinguishes hominids from apes

Question : One of the following sugars cannot be found in honey.

Question : One of the following statements is correct

Question : One of the following is true with respect to AUG.

Question :One of the following is true with respect to AUG :

Question : One of the following is not true ?

Question : One of the following is not the characteristic feature of cyanobacteria:

Question : One of the following is not the kind of euploidy

Question : One of the following is not a natural process

Question : One of the following is not a correct match

Question : One of the following is not a green house gas:

Question : One of the following is neuropeptide hormone.

Question : One of the following is holandric inheritance

Question : One of the following is not a common disorder of the digestive system

Question : One of the following is correct statement.

Question : One of the following is common in earthworm and cockroach

Question : One of the following is anucleate

Question : One of the following is correct statement

Question : One of the following is an untrue statement

Question : One of the following is an exotic breed of cattle

Question : One of the following is a very familiar beetle with red and black marking and is used to get rid of mosquitoes.

Question : One of the following is always negative for a plant cell

Question : One of the following is a source of rubber

Question : One of the following is a nitrogen-fixing enzyme

Question : One of the following is a non essential element which counteract the toxicity of copper and stimulate plant growth

Question : One of the following is a connecting link between protozoans and poriferans

Question :One of the following gesture of electron is useful to green plants in production of assimilatory power during photochemical reactions

Question : One of the following excluded from deuterostomes

Question : One of the following elements is an activator of carbonic anhydrase.

Question : One of the following character is not unique to phylum arthropoda

Question : One of the following animal has no metamorphosis in its life cycle

Question : One of the critical mechanisms by which environment controls the population of a species is :

Question : One of the examples of the action of the autonomous nervous system is :

Question : one of the examples of seeds in which the endosperm is completely consumed during embryo development is

Question : Oneof the commolyused plantgrowth hormoneis tea plantation is

Question : One of the codons on mRNA is AUG. Draw the structure of tRNA adaptor molecule for this codon. Explain the uniqueness of this tRNA

Question : One of the chief reasons among the following for the depletion in the number of species making endangered is ....

Question : One of the causes of variation known by early agriculturists, was hidden in

Question : One of the applications of biotechnology is the production of insect resistant crop plants, Justify the statement with referance to Bt. Cotton.