24277 + Interview Questions in Biology in Class 12 Page 17 InterviewSolution

801.	Question : When two species ofdifferent genealogy come to resemble each other as a result of adaptation, the phenomenon is termed
Answer» MICROEVOLUTION co-EVOLUTION CONVERGENT evolution DIVERGENT evolution SOLUTION :convergent evolution

Discussion

802.	Question : When two plants L and M were exposed to different light intensities and temperature , they showed changes in their rates of photosynthesis , which have been represented in the following graph. The graph indicates that
Answer» Plant L is a `C_3` plant for which the LIGHT SATURATION point is 100% of full sunlight . Plant M is a `C_4` plant for which the OPTIMUM temperature is around `20^@C` Plant M is a `C_3` plant which is more affected at higher temperature and higher light intensity as COMPARED to plant L Plant L is a `C_4` plant and cannot function at light intensities above the saturation point Answer :C

Discussion

803.	Question : When two hybrids rrTt and Rrtt are crossed, the phenotypic ratio of offspring would be
Answer» `3:1` `9:3:3:1` `1:1` ` 1:1:1:1 ` ANSWER :D

Discussion

804.	Question : When two organisms live together helping each other ,the association is called :
Answer» PARASITISM Autoecism Mutualism Saprophytiam Answer :C

Discussion

805.	Question : When two nuclei lie side by side after plasmogamy, this stage is termed as :
Answer» Haplophase Karyogamy Dikaryophase Syngamy Solution :In the certain classes of fungi such as Asecomycetes and Basi - diomycetes , as a result of plasmogamy (FUSION of the PROTOPLASM of two compatible gametes) the NUCLEI of the oppsite strains get themselves arranged in PAIRS but do not fuse. This phase in the life cycle is TERMED as dikaryophase and the process is called dikaryotization .

Discussion

806.	Question : When two heterozygous tall plants are crossed, some short plants appear in the offspring. The appearance of these short plants illustrates
Answer» SEGREGATION and recombination Intermediate INHERITANCE and GENE linkage crossing over and differentiation Codominant inheritance ANSWER :A

Discussion

807.	Question : When true breeding pea plant with yellow wrinkled seeds is crossed to true breedingpea plant with green round seeds the genotype of progeny will be
Answer» yyrr yyRR YyRr yyRR Answer :C

Discussion

808.	Question : When two dominant independently assorting genes react with each other to produce a trait different from that they produced alone,they are called :
Answer» DUPLICATE genes Supplementary genes Collaborative genes Complementery genes Answer :D

Discussion

809.	Question : When true breeding yellow wrinkled seeded pea plant is crossed to true breeding green round seeded pea plant the progeny will be
Answer» All YELOW round All YELLOW wrinkled All GREEN round All green wrinkled Answer :A

Discussion

810.	Question : When two different genes came from same parent they tend to remain together. What is the name of this phenomenon?
Answer» Solution :(i) Linkage (ii) (iii) OBSERVED Pherotypic RATIO 7 : 1 : 1 : 7

Discussion

811.	Question : When true breeding pea plant with yellow cotyledons are round seeds is crossed to a plant with green cotyledons and wrinkled seeds the genotype of progeny will be
Answer» YYRR Yyrr YyRr yyRR Answer :B

Discussion

812.	Question : When to related population that have been geographically isolated come back into contact, retain their reproductive isolation, and complete for the resources, they may be a divergence in traits known as
Answer» CHARACTER convergence sibling speciation phyletic evolution character displacement Answer :D

Discussion

813.	Question : When transfer of pollen grains from anther to stigma of different plants takes place, it is called geitonogamy/xenogamy.
Answer» ANSWER :XENOGAMY

Discussion

814.	Question : When three or more leaves are present at a node, the phyllotaxy is known as :
Answer» Spiral Opposite Whorled None of the above ANSWER :C

Discussion

815.	Question : When there is a disturbance in the Hardy-Weinberg equilibrim, what would it result in?
Answer» SOLUTION :EVOLUTION.

Discussion

816.	Question : When there is a sudden loss of blood from the body the organ which supplies blood is :-
Answer» Spleen Heart Liver Lung Answer :1

Discussion

817.	Question :When there is a decrease in BOD ?(A) When mass of organic matter is used.(B) When organic matter increases.(C) Decrease in the water level.(D) When there is an increase in the O_2quantity.
Answer» When MASS of organic MATTER is used. When organic matter increases. Decrease in the WATER level. When there is an INCREASE in the `O_2`quantity. Solution :When mass of organic matter is used.

Discussion

818.	Question : When there are more than two sets of genomes in a cell,the cell is said to be………..
Answer» SOLUTION :POLYPLOID

Discussion

819.	Question : When the ventricular pressure is low these valves get closed ?
Answer» TRICUSPID VALVE BICUSPID valve Semilunar valves Mitral valve Answer :C

Discussion

820.	Question : When the urine sample of a lady is tested, the presence of HCG is detected.Which is the source of hCG?
Answer» SOLUTION :PLACENTA

Discussion

821.	Question : When the urine sample of a lady is tested, the presence of HCG is detected. What does the presence of hCG indicate?
Answer» SOLUTION :PREGNANCY

Discussion

822.	Question : When the thalamus Isprolonged in to gynoeciu forming acental axis it is called ………….which can be found in ………….
Answer» GYNOPHORE , cleome gynophore , slence CARPOPHORE , PASSIFLORA carpopore , cariandrum ANSWER :D

Discussion

823.	Question : When the tepals of perianath are fused ,the condition is called _____
Answer» ANSWER :Gamophyllous

Discussion

824.	Question : When the stomata are opening , we observe following changes in the guard cells?
Answer» OP increase, TP decreases OP & TP INCREASES OP decreases, TP increases OP & TP decreases Answer :C

Discussion

825.	Question : When the solute has been added in the solution, then following observation can be made ?
Answer» The DPD of the SOLUTION DECREASES The` Psi_W `of the solution decreases DPD of the solution decreases while its `Psi_W` INCREASES DPD of the solution increases while its `Psi_W` decresases Answer :D

Discussion

826.	Question : When the same antigen or pathogen enters for a second time in human body, the resultant secondary immune response is stronger than primary immune response due to
Answer» `T_c` CELLS only T-helper cells only Memory cells (B and T cells) PLASMA cells only Answer :C

Discussion

827.	Question : When the pollen grains are not transferred from anthers to the stigma in flower due to the barrier or fence, it is referred or when some natural barrier exists between androcium and gynoecium to check self pollination it is known as
Answer» Heterostyly Herkogamy Dichogamy Cleistogamy Answer :B

Discussion

828.	Question : When the pollers is transferred from anther to stigma of same flower, the pollination is called autogamy. (a) Cleistogamous flowers are invariably autogamous. Explain. (b) Geitonogamy is functionally cross pollination, but genetically similar to autogamy. Identify the statement. (Kerala Board 2017)
Answer» Solution :(a) CLEISTOGAMOUS flowers remain closed with anthers and stigma lying CLOSE to each other. When the anthers dehisce, the pollen grains come in contact with stigma, pollination takes place. Thus, cleistogamy leads to self-pollination making cleistogamous flowers invariably autogamous (B) Geitonogamy is transfer of pollen grains from anthers of one flower to stigma of another flower of either the same or genetically similar plant. It resembles cross-pollination as it needs a pollinating AGENCY for transfer of pollen grains. Thus, geitonogamy is functionally cross-pollination but genetically LIKE autogamy.

Discussion

829.	Question : When the pollen is transferred from anther to the stigma of the same flower, the pollination is called autogamy.Geitonogamy is functionally cross pollination, but genetically similar to autogamy. Justify the statement.
Answer» SOLUTION :Functionally cross pollination by pollinating agent. Genetically SIMILAR to autogamy - POLLENGRAINS COME from the same PLANT.

Discussion

830.	Question : When the pollen is transferred from anther to the stigma of the same flower, the pollination is called autogamy. Cleistogamous flowers are invariably autogamous. Explain.
Answer» Solution :FLOWERS do not open at all, the ANTHERS and stigma LIE close to each other, when the anther dehisce in the flower buds pollen GRAINS come in contact with the stigma, there is no chance of cross-pollen landing on the stigma. (any one of the above responses)

Discussion

831.	Question : When the plant sporophyte develops to undergo maturation it produces (A) Gemmae (B) Protonema (C) Sporophyll (D) Egg
Answer» GEMMAE PROTONEMA SPOROPHYLL egg Answer :C

Discussion

832.	Question : When the other floral parts are arranged at the base of the gynoecium, the flower is called
Answer» HYPOGYNOUS flower Perigynous flower Epigynous flower Agynous flower Answer :A

Discussion

833.	Question : When the organisms live together in such a manner that one organism is benefited while the other remains unaffected. This type of association is called:
Answer» commensalism symbiosis mutualism parasitism Answer :A

Discussion

834.	Question : When the number of immigration and births is more than emigration and deaths. Growth curve of population will show
Answer» EXPONENTIAL PHASE LAG phase Declining phase STEADY phase ANSWER :A

Discussion

835.	Question : When the level of urea in blood rises to above 0.05%, then this condition is known as ………..
Answer» Uremia Glucosuria Gout Nephritis Answer :A

Discussion

836.	Question : When the immune system attacks our own cells, the process is called……
Answer» INNATE immunity Acquired immunity Auto immunity Humoral immunity Answer :C

Discussion

837.	Question : When the foetus is implanted after fertilisation, menstruation does not occur. Why?
Answer» Solution :When the foetus is IMPLANTED, the progesterone level rises in the blood which prevents ovulation and maintains the pregnancy. HENCE MENSTRUATION does not occur throughout gestation period.

Discussion

838.	Question : When the electrons pass from one carrier to another via complex-I to IV in the electron transport chain, they are coupled to ATP synthase (complex-V) for the production of ATP from ADP and inorganic phosphate.
Answer» ANSWER :1

Discussion

839.	Question : An orchid flower resembling the shape of a female fly so as to be able to get pollinated. This is an example of
Answer» COMPETITIVE release Competitive EXCLUSION INTERFERENCE COMPETITION None Answer :A

Discussion

840.	Question : When the dominant alleles or wild type say AB are present on one chromosome and its alternative recessive alleles a b are located on the other homologous chromosome AB/ab, then the linkkage is said to be in
Answer» REPULSION phase Coupling phase NEUTRAL phase Dominant phase Answer :B

Discussion

841.	Question : When the cross wall between two adjacent cells of Spirogyra is notsimple but H-shaped, it is called______.
Answer» ANSWER :Goligate

Discussion

842.	Question : When the concentration of solutes is greater outside the cell than inside, the solution outside the cell is:
Answer» Isotonic Hypertonic hypotonic none of these Answer :B

Discussion

843.	Question : When the concentration of the soil solutes is low, the absorption of water:
Answer» REMAINS normal Is stopped Is increased Is decreased Answer :C

Discussion

844.	Question : When the concentraionof solution is greater outside the cells then inside the cells,the solution outside the cells is
Answer» ISOTONIC HYPERTONIC Hypotonic NONE of the above Answer :B

Discussion

845.	Question : When the chorionic gonadotropin hormone is secretef from placenta ?
Answer» ANSWER :EARLY PREGNANCY

Discussion

846.	Question : When the cell is fully turgid, its:
Answer» DPD=OP DPD= zero WP=TP OP=zero Answer :B

Discussion

847.	Question : When the axons membrane is positively charged outside and negatively charged inside, then the condition is known as :
Answer» ACTION POTENTIAL RESTING potential ACTIVE potential Differential potential Answer :B

Discussion

848.	Question : When the anther is young, a group of compactly arranged homogenous cells occupies the centre of each microsporangium of the anther. Neme these cells.
Answer» SOLUTION :Sporogenous TISSUE

Discussion

849.	Question : When the BOD in water increases than the level of O_(2) .......
Answer» Increases Remain normal Decreases No CHANGE ANSWER :C

Discussion

850.	Question : When tall and dwarf plants are crossed , from which cross 1 : 1 ratio is obtained ?
Answer» TT and tt tt and tt Tt and Tt TT and Tt Answer :A

Discussion

Explore topic-wise InterviewSolutions in .

Question : When two species ofdifferent genealogy come to resemble each other as a result of adaptation, the phenomenon is termed

Question : When two plants L and M were exposed to different light intensities and temperature , they showed changes in their rates of photosynthesis , which have been represented in the following graph. The graph indicates that

Question : When two hybrids rrTt and Rrtt are crossed, the phenotypic ratio of offspring would be

Question : When two organisms live together helping each other ,the association is called :

Question : When two nuclei lie side by side after plasmogamy, this stage is termed as :

Question : When two heterozygous tall plants are crossed, some short plants appear in the offspring. The appearance of these short plants illustrates

Question : When true breeding pea plant with yellow wrinkled seeds is crossed to true breedingpea plant with green round seeds the genotype of progeny will be

Question : When two dominant independently assorting genes react with each other to produce a trait different from that they produced alone,they are called :

Question : When true breeding yellow wrinkled seeded pea plant is crossed to true breeding green round seeded pea plant the progeny will be

Question : When two different genes came from same parent they tend to remain together. What is the name of this phenomenon?

Question : When true breeding pea plant with yellow cotyledons are round seeds is crossed to a plant with green cotyledons and wrinkled seeds the genotype of progeny will be

Question : When to related population that have been geographically isolated come back into contact, retain their reproductive isolation, and complete for the resources, they may be a divergence in traits known as

Question : When transfer of pollen grains from anther to stigma of different plants takes place, it is called geitonogamy/xenogamy.

Question : When three or more leaves are present at a node, the phyllotaxy is known as :

Question : When there is a disturbance in the Hardy-Weinberg equilibrim, what would it result in?

Question : When there is a sudden loss of blood from the body the organ which supplies blood is :-

Question :When there is a decrease in BOD ?(A) When mass of organic matter is used.(B) When organic matter increases.(C) Decrease in the water level.(D) When there is an increase in the O_2quantity.

Question : When there are more than two sets of genomes in a cell,the cell is said to be………..

Question : When the ventricular pressure is low these valves get closed ?

Question : When the urine sample of a lady is tested, the presence of HCG is detected.Which is the source of hCG?

Question : When the urine sample of a lady is tested, the presence of HCG is detected. What does the presence of hCG indicate?

Question : When the thalamus Isprolonged in to gynoeciu forming acental axis it is called ………….which can be found in ………….

Question : When the tepals of perianath are fused ,the condition is called _____

Question : When the stomata are opening , we observe following changes in the guard cells?

Question : When the solute has been added in the solution, then following observation can be made ?

Question : When the same antigen or pathogen enters for a second time in human body, the resultant secondary immune response is stronger than primary immune response due to

Question : When the pollen grains are not transferred from anthers to the stigma in flower due to the barrier or fence, it is referred or when some natural barrier exists between androcium and gynoecium to check self pollination it is known as

Question : When the pollen is transferred from anther to the stigma of the same flower, the pollination is called autogamy.Geitonogamy is functionally cross pollination, but genetically similar to autogamy. Justify the statement.

Question : When the pollen is transferred from anther to the stigma of the same flower, the pollination is called autogamy. Cleistogamous flowers are invariably autogamous. Explain.

Question : When the plant sporophyte develops to undergo maturation it produces (A) Gemmae (B) Protonema (C) Sporophyll (D) Egg

Question : When the other floral parts are arranged at the base of the gynoecium, the flower is called

Question : When the organisms live together in such a manner that one organism is benefited while the other remains unaffected. This type of association is called:

Question : When the number of immigration and births is more than emigration and deaths. Growth curve of population will show

Question : When the level of urea in blood rises to above 0.05%, then this condition is known as ………..

Question : When the immune system attacks our own cells, the process is called……

Question : When the foetus is implanted after fertilisation, menstruation does not occur. Why?

Question : When the electrons pass from one carrier to another via complex-I to IV in the electron transport chain, they are coupled to ATP synthase (complex-V) for the production of ATP from ADP and inorganic phosphate.

Question : An orchid flower resembling the shape of a female fly so as to be able to get pollinated. This is an example of

Question : When the dominant alleles or wild type say AB are present on one chromosome and its alternative recessive alleles a b are located on the other homologous chromosome AB/ab, then the linkkage is said to be in

Question : When the cross wall between two adjacent cells of Spirogyra is notsimple but H-shaped, it is called______.

Question : When the concentration of solutes is greater outside the cell than inside, the solution outside the cell is:

Question : When the concentration of the soil solutes is low, the absorption of water:

Question : When the concentraionof solution is greater outside the cells then inside the cells,the solution outside the cells is

Question : When the chorionic gonadotropin hormone is secretef from placenta ?

Question : When the cell is fully turgid, its:

Question : When the axons membrane is positively charged outside and negatively charged inside, then the condition is known as :

Question : When the anther is young, a group of compactly arranged homogenous cells occupies the centre of each microsporangium of the anther. Neme these cells.

Question : When the BOD in water increases than the level of O_(2) .......

Question : When tall and dwarf plants are crossed , from which cross 1 : 1 ratio is obtained ?