24277 + Interview Questions in Biology in Class 12 Page 18 InterviewSolution

851.	Question : When stomata closes which of the following events does not occur ?
Answer» guard cell become flaccid sugar is CONVERTED to starch O.P of the guard cell decreases accumulation of `O_(2)` TAKES place Answer :D

Discussion

852.	Question : When stamens are fused by their anthers and the fillaments are free, the condition is called
Answer» Monadelphous Synandrous SYNGENESIOUS EPIPETALOUS ANSWER :C

Discussion

853.	Question : When stem of plant is girdled (ringed) :
Answer» The ROOT DIES first The SHOOT dies first The ROOTS and the shoot will DIE at the same time neither the root nor the shoot wilts Answer :A

Discussion

854.	Question : When seeds are attached to parent plant, the type of germination is called as(A) Ovipary(B)Epigeal(C) Vivipary(D) Hypogeal
Answer» Ovipary EPIGEAL VIVIPARY HYPOGEAL ANSWER :C

Discussion

855.	Question : when secondary occurs, girth of stem increases. Cambial ring increases in diameter due to
Answer» periclinal deivision and radial elongation of cambial CELLS ANTICLINAL DIVISON and radial eleongations of cambial cells both periclinal and anticlinal DIVISONS and radial elongation of cambial cells radial elongation of cambium cells along. Answer :b

Discussion

856.	Question : When RR(red) and rr(white) are being crossed, we got Rr (pink). This shows that
Answer» R is COMPLETELY DOMINANT r is RECESSIVE r is not completely dominant r is dominant Solution :r is not completely dominant

Discussion

857.	Question : When respiratroy substrate is cereal/starch sprouting potato tuber then RQ value is
Answer» 0 unity `GT1` `LT1` ANSWER :B

Discussion

858.	Question : When SA node is stimulated by sympathatic nerve than the –
Answer» RATE of HEART beat and cardiac OUTPUT DECREASES rate of heart beat decreases and cardiac output increases rate of heart beat and cardiac output increases rate of heart beat increases and cardiac output decreases Answer :C

Discussion

859.	Question : When respiratory quoteimt is less than 1.0 in a respiratory metanolism,it means that
Answer» CARBOHYDRATES are used as RESPIRATORY subtrate VOLUMN of CARBON dioxide evolved is less than volumn of oxygen consumed VOLUME of carbon dioxide evolved is more than volume of oxygen consumed Solution :NA

Discussion

860.	Question : When resources in the habitat are un-limited ?
Answer» Population GROWS in an exponential or geometric fashion Impact of NATALITY and mortality BECOMES zero Population shows zero GROWTH rate Population shows Verhulst Pearl-logistic growth Answer :A

Discussion

861.	Question : When resources are limited competitively superior species will eventually eliminate the other species". Substantiate this with an example.
Answer» Solution :The ABINGDON tortoise in GALAPAGOS ISLANDS became EXTINCT within a decade after goats were introduced on the island, apparently due to the greater browsing EFFICIENCY of the goats.

Discussion

862.	Question : When red flowered plants are crossed with white flowered plants the F_(2) generation gives a ration of 3:1. What do you conclude?
Answer» That there are LETHAL genes That three is INDEPENDENT assortment That WHITE COLOUR is dominant That red colour is dominant. Answer :D

Discussion

863.	Question : When red blood corpuscles containing both A and B antigens are mixed with your blood serum, they agglutinate. Hence your blood grop is _____ type.
Answer» AB O A B Answer :B

Discussion

864.	Question :When propagating unit like seeds and spores enter a barren area to initiate the process of succession , it is called :
Answer» NUDATION REACTION ECESIS migration Answer :D

Discussion

865.	Question : When proteins are respiratory substrate, RQ will be
Answer» 20 `1.0` 0.8 1.5 Answer :C

Discussion

866.	Question : When primary sludge is formed during sewage treatment?
Answer» FIRST STEP Second step By PRIMARY effluent By sedimented substances Solution : First step

Discussion

867.	Question : When populations of a plant species are located adjacent to one another because of abrupt changes in soil condotions , they are called
Answer» allopolypoid autopolyploid sympatric parapatric Answer :D

Discussion

868.	Question : When pollen is transferred from anther of a flower to stigma of the another flower of the same plant, it is referred to as
Answer» Allogamy Xenogamy Geitonogamy Autogamy Answer :C

Discussion

869.	Question : When plant absorbs the water from the soil, the water potentialof root cell is________.
Answer» ANSWER :More

Discussion

870.	Question : When phloem surrounds xylem, thevascular bundle is
Answer» CONCENTRIC, leptocentric , occuring in DRACAENA Concentric, hadrocentric, occuring in FERN meristele CONJOINT , bicollateral, occuring in Trichosanthes Conjoint, collateral, occuring is HELIANTHUS Answer :1

Discussion

871.	Question : When partial pressure of CO_(2) rises, the oxygen dissociation curve of haemoglobinat37^(@)C will :
Answer» REMAIN unchanged become irregular shift TOWARDS left shift towards right Solution :Rise in `pCO_(2)` will leads to lowering of `pO_(2)` and thus % saturation of haemoglobin with oxgen willbe LESSER there by shiftingthe oxygen dissociation curveof haemoglobin to right .

Discussion

872.	Question :When parents P_1 and P_2 were crossed, F_2 progeny was produced with three fourth similar features in phenotype to P_2 and F_1 and one fourth possessed contrasting traits. If the traits being considered here are for height with .T. for tall and .t. for short. What will be the possible genontype of P_1 and one fourth of F_2?
Answer» A. TT and Tt B. Tt and tt C. Tt and Tt D. tt and tt SOLUTION :tt and tt

Discussion

873.	Question : When organisms of one adaptive radiation resemble with the organisms of another adaptive radiation, than it is called:
Answer» CONVERGENT evolution Divergent evolution Retrogressive evolution Mega evolution Answer :A

Discussion

874.	Question : When part of human brain is concerned with the regulation of body temperature?
Answer» HYPOTHALAMUS MEDULLA OBLONGATA CEREBELLUM debe Cerebrum ANSWER :A

Discussion

875.	Question : When ovule is straight so the funiculus, chalaza and micropyle lie in one vertical line, the ovule is said to be ?
Answer» ANATROPOUS ovule Amphitropous ovule Orthotropous ovule Hemitropous ovule Answer :C

Discussion

876.	Question : When one molecule of Glucose is completely oxidized in aerobic respiration, how many molecules of carbon dioxide are released in tricarboxylic acid cycle?
Answer» ONE SIX THREE FOUR ANSWER :D

Discussion

877.	Question : When offspring is produced by a single parent with or without the involvement of gamete formation, the reproduction is called
Answer» ASEXUAL reproduction Sexual Parthenogenetic Either A or B Answer :A

Discussion

878.	Question : When one molecule of acetyl CoA enters Krebs cycle, how many molecules of CO_2 are released?
Answer» ANSWER :TWO

Discussion

879.	Question : Which of the following steps performed by person to visualisethe DNA bands obtained from gel electrophoresis ?
Answer» (a) Exposure of DNA fragments to UV RADIATIONS (b) Staining GEL with bromophenol BLUE followed by exposure to UV radiations (c) Staining gel with ETHIDIUM bromide followed by exposure to UV radiations. (d) Person can SEE the bands without staining. Answer :C

Discussion

880.	Question :When natality is balanced by mortality. There will be
Answer» DECREASE in POPULATION growth Zero population growth Increase in population growth Over population Answer :B

Discussion

881.	Question : when natality is balanced by mortality, there will be
Answer» DECREASE in population growth ZERO population growth INCREASE in population growth overpopulation Answer :B

Discussion

882.	Question : When natality is balanced by mortality. There will be :
Answer» DECREASE in POPULATION GROWTH Zero population growth INCREASE in population growth Over population Answer :B

Discussion

883.	Question : When mice were injected with a mixture of bacteria, avirulent pneumococcus bacteria and heat killed virulent, the mice were found dead due to pneumococcus infection. Why ?
Answer» Avirulent BACTERIA were destroyed by virulent bacteria Avirulent stain TRANSFORMED into virulent by ENTERING in mice SOMETHING from the virulent bacteria was transformed to the live avirulent bacteria as a result the avirulent bacteria transformed into virulent bacteria. Heat killed pneumococcus bacteria injected in mice, transformed to the live bacteria. SOLUTION :Something from the virulent bacteria was transformed to the live avirulent bacteria as a result the avirulent bacteria transformed into virulent bacteria.

Discussion

884.	Question : When Mendel self hybridised the F_(1) plants (RrYy) he found that dominantand recessive traits of one characterare segregated ina
Answer» `9:1` RATIO `3:3` ratio `10:6` ratio `3:1` ratio Answer :D

Discussion

885.	Question : When milk curdles, the solid part is called curd and the liquid part is yoghurt.
Answer» True False Answer :WHEY

Discussion

886.	Question : When micropyle, chalaza and hilum lie in straight line, the ovule is said to be :
Answer» ANATROPOUS Orthotropous Amphitropous Campylotropous Answer :B

Discussion

887.	Question : When many genes control only one trait is called
Answer» PLEIOTROPY MULTIPLE allelism polygenic epistasis SOLUTION : multiple allelism

Discussion

888.	Question : When man inhales air containing normal concentration of O_(2) , but also carbon monoxide, he suffers from suffocation because –
Answer» CO, AFFECTS the NERVES of the lungs CO, DESTROY haemoglobin CO FORM stable compound with haemoglobin CO, reacts with `O_(2)` Answer :C

Discussion

889.	Question : When male excites sexually epididymis wall shrinks / contracts.
Answer» Solution :Epididymis is 6 m LONG and a very COILED structure. It provides temporary store house to immature sperms. In which sperm cells GET mature and obtainedcapacity to swim. Whena MALE excites SEXUALLY, the wall of epididymis contracts and sperm cells are transported to vas deferens.

Discussion

890.	Question : When main veins arise from the base and converge at apex venation is known as:
Answer» Unicostate RETICULATE Multicostate parallel Multicostate convergent Multicostate DIVERGENT ANSWER :C

Discussion

891.	Question : When is 'World Food Day' celebrated?
Answer» SOLUTION :`16 OCTOBER`

Discussion

892.	Question : When is the World Wildlife Week observed?
Answer» Firstweekof spetember LAST WEEK of spetember last weekof OCTOBER firstweekof october ANSWER :E

Discussion

893.	Question : When is the structure and composition of a community expected to remain unchanged ?
Answer» Solution :The climax community remains stable as LONG as the ENVIRONMENT remains unchanged. With TIME the XEROPHYTIC HABITAT gets converted into a mesophytic.

Discussion

894.	Question : When is the structure and composition of a community expected to remain unchanged?
Answer» Solution :When the environment REMAINS unchanged, the STRUCTURE and COMPOSITION of a community expected to remain unchanged.

Discussion

895.	Question : When is the response very intense
Answer» When PATHOGEN comes in contact for first TIME. When pathogen comes in contact for second time. When pathogen is present right from birth. When our body does not COME in CONNECT with pathogens. Solution :When pathogen comes in contact for second time.

Discussion

896.	Question : When is MTP acceptable ?
Answer» The child to be born is with DISABILITY is proved by MEDICAL report. Pregnancy due to rape. By failure of any contraceptive pregnancy is caused . All of the above ANSWER :D

Discussion

897.	Question : When is a tumour referred to as malignant?
Answer» SOLUTION :When it STARTS SPREADING to other ORGANS of BODY.

Discussion

898.	Question : When is a taxon said to be extinct?
Answer» Solution :(i) A TAXON is Extinct when there is no reasonable doubt on the death of the last individual. (ii) A taxon is PRESUMED Extinct when exhaustive surveys in known and/ or expected habitat, at appropriate times (DIURNAL, seasonal, annual), throughout its historic range have failed to RECORD an individual. Example: Neuracanthus neesianus.

Discussion

899.	Question : When is a person described as having hypertension?
Answer» Solution :When the blood PRESSURE values are more than 140 MM HG systolic pressure and more than 90 mm Hg DIASTOLIC pressure, then the person is described as having hypertension.

Discussion

900.	Question : When in an association, only one species is benefitted and neither is harmed
Answer» Mutualism Proto-cooperation COMMENSALISM EXPLOITATION ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : When stomata closes which of the following events does not occur ?

Question : When stamens are fused by their anthers and the fillaments are free, the condition is called

Question : When stem of plant is girdled (ringed) :

Question : When seeds are attached to parent plant, the type of germination is called as(A) Ovipary(B)Epigeal(C) Vivipary(D) Hypogeal

Question : when secondary occurs, girth of stem increases. Cambial ring increases in diameter due to

Question : When RR(red) and rr(white) are being crossed, we got Rr (pink). This shows that

Question : When respiratroy substrate is cereal/starch sprouting potato tuber then RQ value is

Question : When SA node is stimulated by sympathatic nerve than the –

Question : When respiratory quoteimt is less than 1.0 in a respiratory metanolism,it means that

Question : When resources in the habitat are un-limited ?

Question : When resources are limited competitively superior species will eventually eliminate the other species". Substantiate this with an example.

Question : When red flowered plants are crossed with white flowered plants the F_(2) generation gives a ration of 3:1. What do you conclude?

Question : When red blood corpuscles containing both A and B antigens are mixed with your blood serum, they agglutinate. Hence your blood grop is _____ type.

Question :When propagating unit like seeds and spores enter a barren area to initiate the process of succession , it is called :

Question : When proteins are respiratory substrate, RQ will be

Question : When primary sludge is formed during sewage treatment?

Question : When populations of a plant species are located adjacent to one another because of abrupt changes in soil condotions , they are called

Question : When pollen is transferred from anther of a flower to stigma of the another flower of the same plant, it is referred to as

Question : When plant absorbs the water from the soil, the water potentialof root cell is________.

Question : When phloem surrounds xylem, thevascular bundle is

Question : When partial pressure of CO_(2) rises, the oxygen dissociation curve of haemoglobinat37^(@)C will :

Question : When organisms of one adaptive radiation resemble with the organisms of another adaptive radiation, than it is called:

Question : When part of human brain is concerned with the regulation of body temperature?

Question : When ovule is straight so the funiculus, chalaza and micropyle lie in one vertical line, the ovule is said to be ?

Question : When one molecule of Glucose is completely oxidized in aerobic respiration, how many molecules of carbon dioxide are released in tricarboxylic acid cycle?

Question : When offspring is produced by a single parent with or without the involvement of gamete formation, the reproduction is called

Question : When one molecule of acetyl CoA enters Krebs cycle, how many molecules of CO_2 are released?

Question : Which of the following steps performed by person to visualisethe DNA bands obtained from gel electrophoresis ?

Question :When natality is balanced by mortality. There will be

Question : when natality is balanced by mortality, there will be

Question : When natality is balanced by mortality. There will be :

Question : When mice were injected with a mixture of bacteria, avirulent pneumococcus bacteria and heat killed virulent, the mice were found dead due to pneumococcus infection. Why ?

Question : When Mendel self hybridised the F_(1) plants (RrYy) he found that dominantand recessive traits of one characterare segregated ina

Question : When milk curdles, the solid part is called curd and the liquid part is yoghurt.

Question : When micropyle, chalaza and hilum lie in straight line, the ovule is said to be :

Question : When many genes control only one trait is called

Question : When man inhales air containing normal concentration of O_(2) , but also carbon monoxide, he suffers from suffocation because –

Question : When male excites sexually epididymis wall shrinks / contracts.

Question : When main veins arise from the base and converge at apex venation is known as:

Question : When is 'World Food Day' celebrated?

Question : When is the World Wildlife Week observed?

Question : When is the structure and composition of a community expected to remain unchanged ?

Question : When is the structure and composition of a community expected to remain unchanged?

Question : When is the response very intense

Question : When is MTP acceptable ?

Question : When is a tumour referred to as malignant?

Question : When is a taxon said to be extinct?

Question : When is a person described as having hypertension?

Question : When in an association, only one species is benefitted and neither is harmed