24277 + Interview Questions in Biology in Class 12 Page 65 InterviewSolution

3201.	Question : Watson and Crick Model of DNA.
Answer» SOLUTION :

Discussion

3202.	Question : Watson and Crick (1953) proposed DNA was based on (i) X-ray diffraction studies studies of DNA dne by Wilkins and Franklin (ii) Chargaff's base equivalence rule (iii)Griffith'stransformation experiment (iv) Meselson and Stahl's experiment.
Answer» (i),(ii) and (iv) (i) and (ii) (iii) and (iv) (i), (ii),(iii) and (iv) Solution :(b) : In 1953, james Waston and FRANCIS Crick based on the X-ray diffraction data produced by Maurice WILKINS and Rosalind Franklin, proposed double helix model for the structure of DNA. One of the hallmarks of their proposition was base pairing between the two strands of polyucleotide chains. However, this proposition was also based on the observation of Erwin Chargaff (1950) that for a double stranded DNA, the ratios between Adenine and Thymine, and Guanine andCytosine are CONSTANT and equals one .

Discussion

3203.	Question : Waterlogging and soil salinity are some of the problems that have come in
Answer» SOIL EROSION WHITE REVOLUTION Green revolution BLUE revolution. Solution :N//A

Discussion

3204.	Question : Water will be absorbed by the root hairs when:
Answer» Conc. of SOLUTES in the CELL sap is high Conc. Of solutes in the soil is high Plant is RAPIDLY respiring None of these Answer :A

Discussion

3205.	Question : Water will be absorbed by root hairs when:
Answer» CONCENTRATION of salts in soil is high concentration of solutes in the cell SAP is high PLANT is RAPIDLY transpiring they are separated from soil by SEMIPERMEABLE membrane Answer :B

Discussion

3206.	Question : Water vascular system is unique feature in_______.
Answer» ANSWER :ECHINODERMATA,

Discussion

3207.	Question : Water vapour dissociate into H_(2)andO_(2). This process is known as
Answer» PHOTODISSOCIATION PHOTOSYNTHESIS PHOTOOXIDATION Photoreduction ANSWER :A

Discussion

3208.	Question : Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbondioxide diffuses into the plant during photosynthesis. Reason out of the above statements using one of following options :
Answer» Both PROCESSES cannot HAPPEN simultaneously Both processes can happen together because the diffusion coefficient of water and CO, is different The above processes happen only during night time One process occurs during DAY time and the other at night Answer :B

Discussion

3209.	Question : Water relations do not include/involve
Answer» Absorption of water by roots Ascent of sap Escape of water VAPOUR from leaves and other aerial parts Conversion INORGANIC ESSENTIAL elements into ORGANIC compounds Answer :D

Discussion

3210.	Question : Water present in human tissue fluid is
Answer» 4 litres 12 litres 2 litres 3 litres. Answer :B

Discussion

3211.	Question : Water potential of a solution is
Answer» Zero Positive Zero or positive Negative Answer :D

Discussion

3212.	Question : Water potential of guard cells during the opening of stomata is
Answer» Lower than water potential of guard cells during CLOSING of STOMATA EQUAL to the water potential of guard cells during closing of stomata HIGHER than guard cells during closing of stomata More than the TP of guard cells during closing of stomata Answer :C

Discussion

3213.	Question : Water potential is less than ‘zero’ when
Answer» CELL is flaccid Cell is plasmolysed Cell is PARTLY TURGID All the above Answer :D

Discussion

3214.	Question : Water potential is denoted by (i) letter Psi or symbol II, and is measured in pressure units such as (ii)
Answer» (i) LATIN (ii) Bars (i) Greek (ii) PASCALS(Pa) (i) Latin (ii) Pascals (i) Greek (ii) Joules Answer :B

Discussion

3215.	Question : Water potential is equal to osmotic potential and pressure potential in
Answer» TURGID cell Flaccid cell Partly turgid cell All the above Answer :D

Discussion

3216.	Question : Water potential in closely placed cell (p,q,r) is given below . Find out correct direction of water movement{:("Cell","Osmotic Potential (MPa)", "Pressure Potential(MPa)"),(p,-0.21,0.05),(q,-0.22,0.02),(r,-0.23,0.05):}(a) p to q (b) q to r (c) r to p (d) r to q
Answer» a,B b,C a, d b,d Answer :C

Discussion

3217.	Question : Water potential in a dry seed is determined by
Answer» OSMOTIC POTENTIAL Pressure potential MATRIC potential all the above Answer :D

Discussion

3218.	Question : Water pollution is causedmainly by three factors such asbiological, chemical and physical. Can you namesome chemical and physical factors of water pollution?
Answer» Solution :CHEMICAL factors . i. OrganicChemical like PCBS , biocides etc. ii. Inorganicchemcial likephosphates,nitrates , fluoridesetc. III. HeavymetalslikeAs, Pb, CD, Hgetc. Physical factors . i. Hot waterdischargefrom industries . iii. OILSPILLS from oil carriers etc.

Discussion

3219.	Question : Water pollution.
Answer» Solution :Water pollution is DEFINED as addition of excess MATERIAL or HEAT to water that is harmful to humnas,animals or DESIRABLE. AQUATIC life.

Discussion

3220.	Question : Water pollination is observed in
Answer» GRASSES WATER hyacinth Water LILY Hydrilla Solution :Parthenocarpic fruits are seedless Fruits of banana are parthenocarpic

Discussion

3221.	Question : Water p ollution Act was passed by the government of India in
Answer» 1974 1984 1972 1992 Answer :A

Discussion

3222.	Question : Water moves across the cells along solute potentialgradient.
Answer» ANSWER :WATER POTENTIAL

Discussion

3223.	Question : Water lost through stoma is from
Answer» GUARD cell Sub stomatal cavity Subsidary cell Lenticel Answer :B

Discussion

3224.	Question : Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.
Answer» Solution :Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution Irrigation without proper drainage of water LEADS to water logging in the soil. Besides affecting the crops, water logging draws salt to the surface of the soil. The salt then is deposited as a thin crust on the land surface or starts collecting at the ROOTS of the plants. This increased salt CONTENT is inimical to the growth of crops and is EXTREMELY damaging to AGRICULTURE.

Discussion

3225.	Question : Water is very essential for life. Write any three features both for plants and animals which enable them to survive in water scarce environment.
Answer» Solution : Plants : Ephemeralmode (COMPLETE life cycle in short period), deep tap roots, deciduous leaves,waxy cutile, sunken stomata, succulence to store water, COR CAM pathway of PHOTOSYNTHESIS Animals: No sweating, uricotelic, BURROWING nature, thick skin ,body covered with scales.

Discussion

3226.	Question : Water is very essential for life. Write any three features for plants and animals which enable them to survive in water scarce environment.
Answer» Solution :(a) Presence of highly developed ROOT system to absorb water. (b) Stems and leaves are covered with waxing COATING or DENSE hairs to avoid transpirational LOSS. ( c ) Modified leaves generally leathery and shiny to reflect light and HEAT.

Discussion

3227.	Question : Water is regularly supplied from the oxidation of food present in the
Answer» LIVER stomach hump intestine ANSWER :C

Discussion

3228.	Question : Water is lost in a liquid state in some plants through hydathodes. These hydathodes:
Answer» REMAIN CLOSED at night Remain closed during day Remain ALWAYS open Do not SHOW any specificity in opening and closing Answer :C

Discussion

3229.	Question : Water is considered as the pollinating agent in some plants. Name any two water pollinated plants .
Answer» SOLUTION :VALLISNERIA , Zostera

Discussion

3230.	Question : Water is a resource
Answer» Non-DEGRADABLE non-MAINTAINABLE Degradable maintainable RENEWABLE Non-renewable Solution : WATER is a degradable maintainable RESOURCE.

Discussion

3231.	Question : Water is adsorbed on colloidal molecules by
Answer» Exosmosis Imbibition Endosmosis Plasmolysis Answer :B

Discussion

3232.	Question : Water-hyacinth vegetatively multiples by offset : agave by……
Answer» ANSWER :B

Discussion

3233.	Question : Water-hyacinth is commonly called 'Terror of Bengal '.Give reason.
Answer» Solution :WATER-hyacinth. is a HIGHLY spreading aquatic weeds, which drains oxygen from the water and LEADS to the DEATH of FISHES.

Discussion

3234.	Question : Water-holding capacity of soil is represented by :
Answer» HYGROSCOPIC WATER Capillary water Both together Gravitational water ANSWER :C

Discussion

3235.	Question : Waterfromsoilentersthe root hairsdue to ______.
Answer» capillaryAction COHESION ADHESION OSMOSIS ANSWER :D

Discussion

3236.	Question : Water can not diffuse through
Answer» Cuticularized or suberized WALL Lignified wall and CELLULOSIC wall Silica rich cell wall of DIATOMS and fungual cell wall Plasma membrane and BACTERIAL cell wall Answer :A

Discussion

3237.	Question : Water absorbed by root hairs from the soil is:
Answer» GRAVITATIONAL WATER SURFACE water Capillary water Hygroscopic water Answer :C

Discussion

3238.	Question : Water above the dissolved O_(2) content may be considered uncontaminated
Answer» 0.8 mg/l 0.009 mg/l 8.0 mg/l `8 MUG`/l Answer :C

Discussion

3239.	Question : Wastewater treatment generates a large quantity of sludge, which can be treated by(A) Anaerobic digesters(B) Floc(C) Chemicals(D) Oxidation pond
Answer» Anaerobic digesters Floc Chemicals Oxidation pond Solution :WASTEWATER treatment produces a large QUANTITY of SLUDGE, which can be treated by anaerobic sludge digesters. These are large heated tanks in which its chemical DECOMPOSITION is catalysed by MICROORGANISM.

Discussion

3240.	Question :Wastewater treatment generates a large quantity of sludge , which can be treated by :
Answer» digesters activated sludges chemicals oxidation pond Answer :D

Discussion

3241.	Question : Waste product of mammal is -
Answer» Ammonia Urea Uric acid Guanine Answer :B

Discussion

3242.	Question : Waste products removed through urea cycle from the blood in liver are I.ammonia II.urea III.carbon dioxideIV.arginine Choose the correct answer.
Answer» I,II and III I and II III and IV II and IV Answer :B

Discussion

3243.	Question : Warm, oxygen-rich upper layer of water in a lake or other body of water is called:
Answer» THERMOCLINE EPILIMNION HYPOLIMNION All of these Answer :B

Discussion

3244.	Question : Wasps and fruits of fig is an example for …………………… type of species interaction.
Answer» SOLUTION :MUTUALISM

Discussion

3245.	Question : Washing down of materials in the soil from upper strata is called
Answer» Eluviation Illuviation Pedogenesis Weathering Answer :A

Discussion

3246.	Question : Warm blooded animals of cold climate have small extremities. This was stated by
Answer» Bargmen Gloger Dollo Allen ANSWER :D

Discussion

3247.	Question : Warm-blooded animals of cold climate have small extremities. This was stated by
Answer» BERGMAN Gloger Dollo Allen Answer :D

Discussion

3248.	Question : Warburg effect is
Answer» The enhancement effect of light on Photosynthesis The FEED BACK inhibition in Photosynthesis The inhibitory effect of high `CO_2` on PHOTOSYSNTHESIS The inhibitory effect of high `O_2` on Photosynthesis Answer :D

Discussion

3249.	Question : Warburg effect has not been observed in
Answer» MAIZE SUGARCANE SORGHUM All of these Answer :D

Discussion

3250.	Question : Walter Sutton is famous for his contribution to
Answer» Genetic engineering Totipotency Quantitative genetics Chromosomal theory of inheritance Solution :Chromosomal theory of inbetitance was PROPOSED by walter SUTTON and T Boveri in 1902. Sutton and Boveri MADE a correlation between Mendel's conclusion about genes and the BEHAVIOUR of chromosome during mitosis and meiosis.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Watson and Crick Model of DNA.

Question : Watson and Crick (1953) proposed DNA was based on (i) X-ray diffraction studies studies of DNA dne by Wilkins and Franklin (ii) Chargaff's base equivalence rule (iii)Griffith'stransformation experiment (iv) Meselson and Stahl's experiment.

Question : Waterlogging and soil salinity are some of the problems that have come in

Question : Water will be absorbed by the root hairs when:

Question : Water will be absorbed by root hairs when:

Question : Water vascular system is unique feature in_______.

Question : Water vapour dissociate into H_(2)andO_(2). This process is known as

Question : Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbondioxide diffuses into the plant during photosynthesis. Reason out of the above statements using one of following options :

Question : Water relations do not include/involve

Question : Water present in human tissue fluid is

Question : Water potential of a solution is

Question : Water potential of guard cells during the opening of stomata is

Question : Water potential is less than ‘zero’ when

Question : Water potential is denoted by (i) letter Psi or symbol II, and is measured in pressure units such as (ii)

Question : Water potential is equal to osmotic potential and pressure potential in

Question : Water potential in closely placed cell (p,q,r) is given below . Find out correct direction of water movement{:("Cell","Osmotic Potential (MPa)", "Pressure Potential(MPa)"),(p,-0.21,0.05),(q,-0.22,0.02),(r,-0.23,0.05):}(a) p to q (b) q to r (c) r to p (d) r to q

Question : Water potential in a dry seed is determined by

Question : Water pollution is causedmainly by three factors such asbiological, chemical and physical. Can you namesome chemical and physical factors of water pollution?

Question : Water pollution.

Question : Water pollination is observed in

Question : Water p ollution Act was passed by the government of India in

Question : Water moves across the cells along solute potentialgradient.

Question : Water lost through stoma is from

Question : Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.

Question : Water is very essential for life. Write any three features both for plants and animals which enable them to survive in water scarce environment.

Question : Water is very essential for life. Write any three features for plants and animals which enable them to survive in water scarce environment.

Question : Water is regularly supplied from the oxidation of food present in the

Question : Water is lost in a liquid state in some plants through hydathodes. These hydathodes:

Question : Water is considered as the pollinating agent in some plants. Name any two water pollinated plants .

Question : Water is a resource

Question : Water is adsorbed on colloidal molecules by

Question : Water-hyacinth vegetatively multiples by offset : agave by……

Question : Water-hyacinth is commonly called 'Terror of Bengal '.Give reason.

Question : Water-holding capacity of soil is represented by :

Question : Waterfromsoilentersthe root hairsdue to ______.

Question : Water can not diffuse through

Question : Water absorbed by root hairs from the soil is:

Question : Water above the dissolved O_(2) content may be considered uncontaminated

Question : Wastewater treatment generates a large quantity of sludge, which can be treated by(A) Anaerobic digesters(B) Floc(C) Chemicals(D) Oxidation pond

Question :Wastewater treatment generates a large quantity of sludge , which can be treated by :

Question : Waste product of mammal is -

Question : Waste products removed through urea cycle from the blood in liver are I.ammonia II.urea III.carbon dioxideIV.arginine Choose the correct answer.

Question : Warm, oxygen-rich upper layer of water in a lake or other body of water is called:

Question : Wasps and fruits of fig is an example for …………………… type of species interaction.

Question : Washing down of materials in the soil from upper strata is called

Question : Warm blooded animals of cold climate have small extremities. This was stated by

Question : Warm-blooded animals of cold climate have small extremities. This was stated by

Question : Warburg effect is

Question : Warburg effect has not been observed in

Question : Walter Sutton is famous for his contribution to