24277 + Interview Questions in Biology in Class 12 Page 462 InterviewSolution

23051.	Question : A pure tall and a pure dwarf plant were crossed to produced offsprings . Offsprings were self crossed, then find out the ratio between true breeding tall to true breeding dwarf?
Answer» I:I 3:I 2:I 1:2:I Answer :A

Discussion

23052.	Question : A pure tall and a pure dwarf plant were crossed to produced offsprings . Offsprings were self crossed then find out the ratio between true breeding tall to true breeding dwarf ?
Answer» 1:1 3:1 2:1 1:2:1 Answer :A

Discussion

23053.	Question : a pure tall and a pure dwarf plant were crossed to produce offspring. Offspring were selfcrossed with dwarf plant then:
Answer» `1:1` `3:1` `2:1` `1:2:1` ANSWER :B

Discussion

23054.	Question : A protozoan reproduces by binary fission. What will be the number of protozoans in its population after sixth generation ?
Answer» 128 24 64 32 ANSWER :C

Discussion

23055.	Question : A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?
Answer» 64 128 24 32 Answer :A

Discussion

23056.	Question : A protoxin is:
Answer» A PRIMITIVE toxin A DENATURED toxin Toxin PRODUCED by protozoa Inactive toxin Answer :D

Discussion

23057.	Question : A protoxin is
Answer» a PRIMITIVE toxin a DENATURED toxin toxin PRODUCED by protozoa inactive toxin Answer :D

Discussion

23058.	Question : [A]: Protostele is most simple primitive type of stele. [R]: According to Histogen theory there are three distinct apical layers which give rise to distinct tissue system of the body.
Answer» If both A and R are TRUE and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false Answer :B

Discussion

23059.	Question : A protoxin is(A) A primitive toxin(B) A denatured toxin(C) Toxin produced by protozoa(D) Inactive toxin
Answer» A primitive toxin. A denatured toxin Toxin produced by protozoa Inactive toxin Solution :BT toxin is a protein. This toxin does not kill the Bacillus because the Bt toxin protein is inactive protein but once an insect INGESTS the inactive toxin, it is CONVERTED into an active FORM of toxin due to the ALKALINE pH of the gut which solubilise the crystals.

Discussion

23060.	Question : [A]: Proteins are polymers of amino acids. [R]: Nucleic acids are polymers of units known as nucleotides
Answer» If both A and R are TRUE and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :B

Discussion

23061.	Question : [A] : Prostaglandins are hormone like mol- ecules produced by many body cells of mam- mals [R]: Prostaglandins stimulates contraction of smooth muscles, secretion and piatelet ag- gregation.
Answer» If both A and R are true and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :B

Discussion

23062.	Question : [A): Prokaryotic cells do not contain repres- sor protein[R]: They do not function as genetic valves by combining with specific genes to turn on their activity.
Answer» If both A and R are TRUE and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :D

Discussion

23063.	Question :A prokaryotic autotrophic nitrogen fixing symbiont is found in
Answer» Alnus Cycas Cicer Pisum ANSWER :B

Discussion

23064.	Question : A prokaryotic autotrophic nitrogen fixing symbiont is found in:
Answer» Alnus Cycas Cicer Pisum Answer :B

Discussion

23065.	Question : A prokaryotic autotrophic nitrogen fixing symbiont is found in
Answer» CYCAS Cicer Pisum Alnus Solution :(a) the CORALLOID root of Cycas is symbiotically associated with nitrogen fixing blre-green algae, Anabaena cycadae and Nostoc punctiforme. These blue green-algae (cyanobacteria) are prokaryotic, photosynthetic and AUTOTROPHIC.

Discussion

23066.	Question : A prokaryote gene of 600 nucleotides long can code for a polypeptide chain of about, how many amino acids ?
Answer» 100 200 300 600 Answer :B

Discussion

23067.	Question : A progressive series of changes in plants and animal life in an area from initial colonisation is called as
Answer» EVOLUTION SUCCESSION SELECTION SPECIALISATION SOLUTION :Succession

Discussion

23068.	Question : (a) Producer (b ) Consumer (c ) Decomposers (d) Water
Answer» SOLUTION :WATER. It is a abiotic component of an ECOSYSTEM, allothers are BIOTIC component of an ecosystem

Discussion

23069.	Question : A progeny of F_1 is crossed with the homozygous recessive parent. What is this cross called? Work out how is it useful?
Answer» Solution :When a PROGENY of `F_1` is crossed with the HOMOZYGOUS recessive PARENT, it is called test CROSS. Such a cross is useful to determine the genotype of an unknown i.e., whether it is heterozygous, or homozygous DOMINANT for the trait.

Discussion

23070.	Question : A process that' makes important difference between C_3and C_4plants is,
Answer» Transpiration Glycolysts Photosynthesis Photorespiration Answer :D

Discussion

23071.	Question : The process that makes important difference between C_3 and C_4plants is
Answer» PHOTOSYNTHESIS PHOTORESPIRAITION TRANSPORTATION Glycolysis Answer :B

Discussion

23072.	Question : A procedure, through which a piece of DNA is introduced into a host bacterium
Answer» Transduction TRANSFORMATION Conjugation RDNA TECHNOLOGY ANSWER :B

Discussion

23073.	Question : A probe which is a molecule used to locate specific sequence in a mixture of DNA or RNA molecules could be
Answer» a single stranded RNA a single stranded DNA either RNA or DNA can be SSDNA but not ssRNA Solution :The molecular probes are usually single stranded pieces of DNAS (sometimes RNAs) labelled with radio ISOTOPES such as phosphorus-32. Molecular probes are AVAILABLE for many genetic disorders such as Duchenne muscular dystropy, cystic fibrosis, Tay-Sachs disease.

Discussion

23074.	Question : A probe which is a molecule used to locate specific sequences in a mixture of DNA or RNA molecules could be:
Answer» A SINGLE stranded RNA A single stranded DNA Either RNA or DNA Can be ss DNA but not ss RNA Answer :C

Discussion

23075.	Question : A probe which is a molecule used to locate homologous sequences in a mixture of DNA or RNA molecules could be(A) a ssRNA(B) a ssDNA(C) either RNA or DNA(D) can be ssDNA but not ssRNA
Answer» A SSRNA A ssDNA Either RNA or DNA Can be ssDNA but not ssRNA Solution :A single stranded DNA or RNA, TAGGED with a radioactive MOLECULE is called Probe.

Discussion

23076.	Question : A primary character of chordata is :
Answer» PAIRED NERVE chord Ganglionated nerve chord DORSAL tubular nerve chord Solid VENTRAL nerve chord Answer :C

Discussion

23077.	Question : A prey develops defence against predator. Justify the statement with two examples in animals.
Answer» Solution :(a) Insects and frogs are cryptically coloured (camouflaged) (b) Some are poisonous and therefore avoided by the predators (C) Monarch butterfly is HIGHLY distasteful to its predators Detailed Answer: (a) Insects and frogs are cryptically COLORED (camouflaged). This adaptation is to avoid being detected by the predator. (b) Some of the insects and frogs are poisonous and therefore avoided by the predators. (c) Monarch butterfly is highly distasteful to its predator (bird) due to presence of special chemical in its body. This chemical is ACQUIRED by FEEDING a poisonous weed during caterpillar stage.

Discussion

23078.	Question : [A]: Presence of tail in children is a vestigial character.[R]: This is due to the phenomenon called atavism
Answer» If both A and R are true and R is the correct EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :A

Discussion

23079.	Question : A presciption letter rads the following treatment advise-Metronidazole, Tinidazole, Emetine. Which amongst the following diseases is it dealing with ?
Answer» DENGUE MALARIA AMOEBIASIS PNEUMONIA Answer :C

Discussion

23080.	Question : A prey develops defence against a predator. Justify the statement with two examples in animals and plants.
Answer» SOLUTION :Prey SPECIES have envolved various defences to lessen the impact of predation. i) Camouflage-Insects and Frog cryptically-coloured to avoid being detected easily by the PREDATOR EG. Frogs ii) Some are secreting poisonous chemicals during there development Eg. Monarch BUTTERFLY.

Discussion

23081.	Question :A pregnant lady was admitted to a hospital for delievery, but delievery is delayed more than the expected time. The doctor prescribed to take a hormone injection. Which gland in the body normally secretes this hormone?
Answer» SOLUTION :PITUITARY

Discussion

23082.	Question : A pregnant lady was admitted to a hospital for delievery, but delievery is delayed more than the expected time. The doctor prescribed to take a hormone injection. How does this hormone helps in delievery?
Answer» SOLUTION :Oxytocin stimulates the rhythmic contraction of SMOOTH muscles of uterine wall. It is called labour PAIN. Continued powerful contraction ruptures amnion and expels BABY through vagina. Complete EXPULSION of the baby is called delivery.

Discussion

23083.	Question : A pregnant lady was admitted to a hospital for delievery, but delievery is delayed more than the expected time. The doctor prescribed to take a hormone injection. Name the hormone
Answer» SOLUTION :OXYTOCIN

Discussion

23084.	Question : A portal system is one in which
Answer» A vein STARTS from an organ and ENDS up in HEART A vein starts from an organ and ends up in another organ A vein starts from heart and ends up in lungs None of these Answer :B

Discussion

23085.	Question : A portal vein is
Answer» A vein starts from an ORGAN and ENDS in the heart A vein ENTERS into an organ other than the heart and breaks up into capillaries An artery breaks up in an organ and restarts by union of these capillaries The BLOOD from gut is brought into KIDNEYS before it is poured into posterior vena cava Answer :B

Discussion

23086.	Question : A population will not exists in Hardy-Weinberg equilibrium if.
Answer» there are no mutation there is no MIGRATION The populations is LARGE INDIVIDUALS MATE selectivety ANSWER :D

Discussion

23087.	Question : A population with a larger proportion of post- reproductive individuals is likely to
Answer» grow at a FASTER rate remain stable for a long TIME decline in course of time have more nutulity than mortality Answer :C

Discussion

23088.	Question : A population will not exist in Hardy - Weinberg equilibrium if
Answer» INDIVIDUALS MATE SELECTIVELY There are no mutations There is no migration The POPULATION is large Solution :Individuals mate selectively

Discussion

23089.	Question : A population will not exist in Hardy-Weinberg equilibrium if:
Answer» INDIVIDUALS MATE SELECTIVELY there are no MUTATIONS there is no migration the POPULATION is large Solution : individuals mate selectively

Discussion

23090.	Question : A population will not exist in Hardy-Weinberg equilibrium if
Answer» INDIVIDUALS MATE SELECTIVELY There are no mutations There is no migration The POPULATION is large Solution :Individuals mate selectively

Discussion

23091.	Question : A population of 208 people of MN blood group was sampled and it was found that 119 were MM group, 76 MN group and 13 MN group. Answer the following questions:How does the above frequencies affect evolution ?
Answer» SOLUTION :The FREQUENCIES FOLLOW Handy-Weinberg EQUILIBRIUM -so,no EVOLUTION.

Discussion

23092.	Question : A population that exhibits birth rates that are identical to the death rate implies.
Answer» INITIAL GROWTH PLATEAU phase Acceleration phase Log phase Answer :B

Discussion

23093.	Question : A population of genetically identical plants derlved from a single parent is called……….
Answer» ANSWER :C

Discussion

23094.	Question : A population of 208 people of MN blood group was sampled and it was found that 119 were MM group, 76 MN group and 13 MN group. Answer the following questions:Determine the gene frequencies of M and N alleles in the population.
Answer» SOLUTION :FREQUENCY of M-0.75 Frequency of N-0.25

Discussion

23095.	Question : A population is in Hardy-Weinberg equilibrium for a gene with only two alleles. If the gene frequency of an allel A is 0.7, the genotype frequency of Aa is
Answer» 0.21 0.42 0.36 0.7 Answer :A

Discussion

23096.	Question :A population has two times heterozygotes as homozygous dominant. What is the frequency of the dominant allele ?
Answer» `0.2` `0.5` `0.1` `0.8` ANSWER :B

Discussion

23097.	Question : A population is exhibiting genetic equilibrium. Answer the following with regard to this statement. Name any two factors which could upset the genetic equilibrium of the population.
Answer» SOLUTION :GENE MUTATION and RECOMBINATION.

Discussion

23098.	Question : A population is exhibiting genetic equilibrium. Answer the following with regard to this statement. Explain the above statement.
Answer» Solution :The relative frequency of alleles in SEXUALLY reproducing organisms in a given population remains constant from generation to generation in CASE evolutionary FORCES are not OPERATING.

Discussion

23099.	Question : A population is exhibiting genetic equilibrium. Answer the following with regard to this statement. Name the underlying principle.
Answer» SOLUTION :HARDY Weinberg.s LAW of EQUILIBRIUM.

Discussion

23100.	Question : A population has more young individuals compared to the older individuals. What would be the status of the population after some years?
Answer» It will DECLINE It will stabilise It will increase It will FIRST decline and then stabilise Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : A pure tall and a pure dwarf plant were crossed to produced offsprings . Offsprings were self crossed, then find out the ratio between true breeding tall to true breeding dwarf?

Question : A pure tall and a pure dwarf plant were crossed to produced offsprings . Offsprings were self crossed then find out the ratio between true breeding tall to true breeding dwarf ?

Question : a pure tall and a pure dwarf plant were crossed to produce offspring. Offspring were selfcrossed with dwarf plant then:

Question : A protozoan reproduces by binary fission. What will be the number of protozoans in its population after sixth generation ?

Question : A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

Question : A protoxin is:

Question : A protoxin is

Question : [A]: Protostele is most simple primitive type of stele. [R]: According to Histogen theory there are three distinct apical layers which give rise to distinct tissue system of the body.

Question : A protoxin is(A) A primitive toxin(B) A denatured toxin(C) Toxin produced by protozoa(D) Inactive toxin

Question : [A]: Proteins are polymers of amino acids. [R]: Nucleic acids are polymers of units known as nucleotides

Question : [A] : Prostaglandins are hormone like mol- ecules produced by many body cells of mam- mals [R]: Prostaglandins stimulates contraction of smooth muscles, secretion and piatelet ag- gregation.

Question : [A): Prokaryotic cells do not contain repres- sor protein[R]: They do not function as genetic valves by combining with specific genes to turn on their activity.

Question :A prokaryotic autotrophic nitrogen fixing symbiont is found in

Question : A prokaryotic autotrophic nitrogen fixing symbiont is found in:

Question : A prokaryotic autotrophic nitrogen fixing symbiont is found in

Question : A prokaryote gene of 600 nucleotides long can code for a polypeptide chain of about, how many amino acids ?

Question : A progressive series of changes in plants and animal life in an area from initial colonisation is called as

Question : (a) Producer (b ) Consumer (c ) Decomposers (d) Water

Question : A progeny of F_1 is crossed with the homozygous recessive parent. What is this cross called? Work out how is it useful?

Question : A process that' makes important difference between C_3and C_4plants is,

Question : The process that makes important difference between C_3 and C_4plants is

Question : A procedure, through which a piece of DNA is introduced into a host bacterium

Question : A probe which is a molecule used to locate specific sequence in a mixture of DNA or RNA molecules could be

Question : A probe which is a molecule used to locate specific sequences in a mixture of DNA or RNA molecules could be:

Question : A probe which is a molecule used to locate homologous sequences in a mixture of DNA or RNA molecules could be(A) a ssRNA(B) a ssDNA(C) either RNA or DNA(D) can be ssDNA but not ssRNA

Question : A primary character of chordata is :

Question : A prey develops defence against predator. Justify the statement with two examples in animals.

Question : [A]: Presence of tail in children is a vestigial character.[R]: This is due to the phenomenon called atavism

Question : A presciption letter rads the following treatment advise-Metronidazole, Tinidazole, Emetine. Which amongst the following diseases is it dealing with ?

Question : A prey develops defence against a predator. Justify the statement with two examples in animals and plants.

Question :A pregnant lady was admitted to a hospital for delievery, but delievery is delayed more than the expected time. The doctor prescribed to take a hormone injection. Which gland in the body normally secretes this hormone?

Question : A pregnant lady was admitted to a hospital for delievery, but delievery is delayed more than the expected time. The doctor prescribed to take a hormone injection. How does this hormone helps in delievery?

Question : A pregnant lady was admitted to a hospital for delievery, but delievery is delayed more than the expected time. The doctor prescribed to take a hormone injection. Name the hormone

Question : A portal system is one in which

Question : A portal vein is

Question : A population will not exists in Hardy-Weinberg equilibrium if.

Question : A population with a larger proportion of post- reproductive individuals is likely to

Question : A population will not exist in Hardy - Weinberg equilibrium if

Question : A population will not exist in Hardy-Weinberg equilibrium if:

Question : A population will not exist in Hardy-Weinberg equilibrium if

Question : A population of 208 people of MN blood group was sampled and it was found that 119 were MM group, 76 MN group and 13 MN group. Answer the following questions:How does the above frequencies affect evolution ?

Question : A population that exhibits birth rates that are identical to the death rate implies.

Question : A population of genetically identical plants derlved from a single parent is called……….

Question : A population of 208 people of MN blood group was sampled and it was found that 119 were MM group, 76 MN group and 13 MN group. Answer the following questions:Determine the gene frequencies of M and N alleles in the population.

Question : A population is in Hardy-Weinberg equilibrium for a gene with only two alleles. If the gene frequency of an allel A is 0.7, the genotype frequency of Aa is

Question :A population has two times heterozygotes as homozygous dominant. What is the frequency of the dominant allele ?

Question : A population is exhibiting genetic equilibrium. Answer the following with regard to this statement. Name any two factors which could upset the genetic equilibrium of the population.

Question : A population is exhibiting genetic equilibrium. Answer the following with regard to this statement. Explain the above statement.

Question : A population is exhibiting genetic equilibrium. Answer the following with regard to this statement. Name the underlying principle.

Question : A population has more young individuals compared to the older individuals. What would be the status of the population after some years?