24277 + Interview Questions in Biology in Class 12 Page 419 InterviewSolution

20901.	Question : Assertion : When the DNA sequences of two people are cut using the same restriction enzyme, the length and number of fragments obtained are different for both. Reason : DNA sequence is arranged tandemly in many copy numbers which varies from chromosome to chromosome in an individual, showing high degree of polymorphism.
Answer» If both assertion and REASON are TRUE and reason is the correct explanation of assertion If both assertion and reason are true butreason is NOTTHE correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(a)

Discussion

20902.	Question : Assertion :- When monochromatic light is incident on a surface separating two medium, the reflected and refracted light has same frequency as incident light. Reason :- Reflection and refraction arise through interaction of incident light with atoms of matter and atoms act as oscillator which takes up frequency of incident light and undergoes forced oscillation and scatters light of same frequency.
Answer» If both ASSERTION & Reason are True & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. ANSWER :A

Discussion

20903.	Question : Assertion: When embryo sac develops from magaspore mother cell, it is called diplospory, Reason: In diplospory, two spores are formed.
Answer» If both ASSERTION and REASON are true and Reason is CORRET explanation of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :C

Discussion

20904.	Question :Assertion :- Water uplifting in aerial parts of plant body have high tensile strength and capillarity. Reason:- Water have three main physical properties that is cohesion, adhesion and surface tension
Answer» If both ASSERTION and reason are true and reason is the correct EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is FALSE. If both assertion and reason are false Answer :A

Discussion

20905.	Question : Assertion : Watson and Crick provided experimental proof of semiconservation nature of DNA relication.
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 but R is false A is false but R is true. Solution :Watson and CRICK suggested that replication of DNA is semiconservative . Semiconervative. Nature of DNA replication WSA proved by Messelson and Stahl by USING HEAVY isotope of nitrogen (15N). DNA polymerase III establishes phosphodiester linkages between the adjacent deoxyribo-nucleoside phosphate in presence of ATP/GTP, TPP and `Mg^(2+)` . It produces a new strand of DNA. DNA polymerase binds nucleotides in 5'-3' DIRECTION.

Discussion

20906.	Question : Assertion : Virus-infected cells secrete proteins known as interferons. Reason : Interferona protect the non-infected cells from bacterial infection.
Answer» If both assertion and reason are true and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertin is true but reason is false. If both assertion and reason are false. Solution :Virus-infected cells secrete PROTEINS CALLED interferons which protect non-infected cells from further VIRAL infection.

Discussion

20907.	Question : Assertion Viruses possess only a portion of theproperties of organisms. Reason Viruses are simpler thanbacteria.
Answer» Both ASSERTION and Reason are true and Reason is the correct explanation of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true, but Reason is false Assertion is false , but Reason is true Solution :Prions are proteinaceous infectious particles and are KNOWNTO cuase Dovine Spongiform Encephalopathy(BSE), Creutzfeldt JAKOB disease, etc. Prions are unique as they do not possess NUCLEIC ACIDOF their own .

Discussion

20908.	Question : Assertion: Virus-free plants can be produced from virus infected plants by means of meristem tissue culture, Reason: The virus fails to grow during the growth of host tissue in the artificial medium.
Answer» If both ASSERTION and Reason are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the Reason is not the correct explanation of the assertion If assertion is true but the Reason are false If both Assertion and Reason are false Answer :C

Discussion

20909.	Question : Assertion: Vigorous contraction of the uterus at the end of pregnancy causes expulsion. Reason: The stimulatory reflex between the uterine contraction and oxytocin secretion results in weakening contractions.
Answer» Solution :Vigorous contraction of the uterus at the end of pregnancy causes parturition. Parturition is induced by a complex neuroendocrine mechansim. The signals for parturition originate from the fully developed fetus and the placenta which INDUCE mild uterine contractions called FETAL ejection REFLEX. This triggers release of OXYTOCIN from the maternal pitutiary. Oxytocin acts on the uterine MUSCLE and causes stronger uterine contractions, which in turn stimulates further secretion of oxytocin. The stimulatory relfex between the uterine constraction and oxytocin secretion continues. resulting in stronger and stronger contractions.

Discussion

20910.	Question : Assertion Vegetarians may take infertile eggs produced by purely female stocks in which male chickens are not kept. Reason: Such eggs often called vegetarian eggs, are equivalent to milk in that both are animal products and do not produce life.
Answer» If both Assertion and Reason are TRUE and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the Reason is not the correct explanation of the assertion If assertion is true but the Reason are false If both Assertion and Reason are false Answer :A

Discussion

20911.	Question : Assertion: Vegetables are important part of healthy eating. Reason: Vegetables are succulent structures of plants with pleasant aroma and flavours.
Answer» a) ASSERTION is correct, REASON is WRONG b) Assertion is wrong, Reason is correct c) Both are correct and reason is the correct explanation for assertion. d) Both are correct and reason is not the correct explanation for assertion. Answer :C

Discussion

20912.	Question : Assertion : Variety of fruit colours in Cucurbita pepo is result of recessive epistasis Reason : In recessive epistatsis, a recessive gene at one locus engances the expression of another gene, at a diferent locus.
Answer» A is true and R is true and R is correct explanation of A A and R both are true and R is not correct explanation of A A is true but R is false Both are false Solution :Fruit colour of summer squash (Cucurbita pepo) is governed by a gene which produced yellow colour in dominant state (Y) and GREEN colour in recessive state (yy). There is a non-pigment forming epistatic gene which in dominant state (W-) produces white colour (W-Y-,W-yy) while in recessive state it allows the yellow (wwY-) and green (wwyy) expression. This shows dominant epistasis where a dominant epistatic ALLELE suppresses the expression of a non allelic gene WHETHER the latter is dominant or recessive

Discussion

20913.	Question : Assertion: Use of fertilisers greatly enhances crop productivity.Reason: Irrigation is very important in increasing crop productivity.
Answer» If both Assertion and REASON are TRUE and the Reason is the correct explanation of the Assertion If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20914.	Question : Assertion: UV rays are carcinogenic in nature. Reason: It stimulates the growth of cancer.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the correct EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :D

Discussion

20915.	Question : Assertion: Vaccination is also called preventive inoculation.Reason: A vaccine prevents the formation of antibodies inside the body.
Answer» ANSWER :C

Discussion

20916.	Question :Assertion :- Upon the displacement of charges within a closed surface thevec Eat any point on surface doesn't change. Reason :- The flux crossing through closed surface depends of location of charge within the surface.
Answer» If both ASSERTION & Reason are True & the Reason is a correct EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. SOLUTION :When we displace the charges WITHIN the closed surface`vecE` at every point on surface changes but`phi `crossing through closed surface doesn't change.

Discussion

20917.	Question : Assertion : USA's patent of brazzein is an examoke of biopiracy Reason : Brazzein a protein obtained from West African plant, Pentadiplandra brazzeana and the gene encoding it has been patented by USA.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false If both assertion and reason are false Solution :BRAZZEIN is produced by Pentadiplandra brazzeana and is approximately 2,000 times as sweet as sugar. It is used as a low calorie SWEETENER. Local people have been using the SUPER sweet berries from their plants for centuries but PROTEIN brazzein and the gene coding it is patened in U.S.A it is proposed to transfer the brazzein gene into maize and express it in maize KERNELS from where it can be extracted. This is an example of biopiracy.

Discussion

20918.	Question : Assertion : Under conditions of high light intensity and limited CO_(2) supply, photorespiration has a useful role in protecting the plants from photo oxidative damage. Reason If enough CO_(2) is not avilable to utilize light enregy for carboxylation to proceed, the excess energy may not cause damage to plants.
Answer» If both ASSERTION & Reason are true and the reason is the correct explanation of the assertion. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion. If Assertion is true statement but Reason is false. It both Assertion and Reason are false statements. Solution :Photorespiration protects the plants from photoxidative DAMGAE by dissipating excessof excitation ENERGY. When the `CO_(2)` supply is limited and under high light intensity photorespiration takes place thus protecting the plants. If enough `CO_(2)` is not available to utilize light energy for carboxylation to PROCEED, the excess energy will cause phtoxidative damage to the plants. the energy = liberated should be used in photophosphorylation in presence of `CO_(2)`. if `CO_(2)` is less then in `C_(3)` plants `O_(2)` combines with RuBP to from phosphoglycollate thus utilizing the excess energy.

Discussion

20919.	Question : Assertion :- Underground stem helps in perennation. Reason :- Underground stem can overcome adverse environmental conditions.
Answer» If both ASSERTION & REASON are TRUE & Reason is a correct explanation of the Assertion. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are false. Answer :A

Discussion

20920.	Question : Assertion :Untranslatedregions are sequences of RNA before initiation codonand after termination codon. Reason : Untranslated regionsprovide stability to mRNA and also increase translational efficiency.
Answer» If both ASSERTION and reason are TRUE and reason is the correct EXPLANATION of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(B)

Discussion

20921.	Question : Assertion :-Underground stem hel p s in perennation. Reason :-Underground stem can overcome adverse environmental conditions.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False If both Assertion & Reason are false Answer :A

Discussion

20922.	Question : Assertion Two turns of Krebs cycle occur per glucose molecule used. Reason Each turn of Krebs cycle produces 3 NADH, IFADH_(2) and 1 ATP molecule.
Answer» Both A and R are true and R is the correct explanation of A Both A and R are true, but R is not the correct explanation of A A is true, but R is false A and R are false Solution :Glucose is converted into two mclecules of pyruvic acid so, two CYCLES of Krebs' cycle occur for one per glucose molecule. Each turn of Krebs' cycle produces 3 NADH, 1 `FADH_(2)` and 1 ATP molecule. On oxidation, NADH produces 3 ATP molecules and 1 `FADH_(2)`, WINCH in turn procduces 2 ATP molecules. Thus, in each turn of Krebs' cycle 12 ATP moleculee are produced. Two Krebs cycles occur per glucose molecule because GLYCOLYSIS results in the formation of 2 pyruvic acid molecules by glucose breakdown.

Discussion

20923.	Question : Assertion: Two chromatids remain held together at one point called centromere.Reason: Chromosome is double at all points along its length excluding centromere.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20924.	Question : Assertion :- Tubular is of considerable importance in Marine teleost fishes. Reason :- These fishes have no glomerular kidney .
Answer» If both ASSERTION & Reason are True & the Reason is a CORRECT explanation of the Assertion . If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion If Assertion is True but the Reason is False. If both Assertion & Reason are false. ANSWER :1

Discussion

20925.	Question : Assertion :tRNA recognises its corresponding codon in mRNA. Reason : For each codon, there is an individual tRNA.
Answer» If both assertion and reason are true and reason is the correct EXPLANATION of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(c) : tRNA has an ANTICODON loop which has 7 bases, out of which three bases form anticodon for recognising and attching to the codon of mRNA . Since there are 61 codons specifying AMINO acids, the cell should CONTAIN 61 different tRNAmolecules, each with a different anticodon. Actually,however, the number of tRNA molecule types discovered is much LESS than 61. This implies thatthe anticodons of some tRNAread moer than one codon on mRNA.

Discussion

20926.	Question : Assertion: Triticale is the most remarkable man-made cereal, joins the rank of cereals. Reason: The crop is not suited for bread making
Answer» If both ASSERTION and REASON are true and the Reason is the correct explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the Reason is not the correct explanation of the assertion If assertion is true but the Reason are false If both Assertion and Reason are false Answer :B

Discussion

20927.	Question : Assertion :- Transport proteins of root endodermal cells are control points of plant. Reason:- Transport proteins of root endodermal cells adjust the quantity and types of solutes that reach the xylem.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

20928.	Question : Assertion : Transgenic plants having virus coat protein gene, express resistance to that virus and other related varieties Reason : Coat protein gene interferes with uncoating of viruses inside the plant cells.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false If both assertion and reason are false Solution :Transgenic PLANTS having virus coat protein gene linked to a strong promoter have been produced in many crop plants e.g., tabacco,tomato,alfalfa,sugar beet, potato,etc. the first transgenic plant of this type was tobacco produced in 1986, which contained coat protein gene of Tobacco Mosaic. Virus (TMV) strain. `U_(1)`. Most likely the resistance generated by CP (coat protein gene) is due to the BLOCKING of the process of uncoating of virus PARTICLES, which is neccessary for viral genome replication as well as expression. However, other effects seem to be involved in producing coat protein mediated virus resistance.

Discussion

20929.	Question : Asseration :Tracheal walls are supported by rings of cartilage. It helps in the free passage of air .
Answer» Both Assertion and REASON are true and Reason is CORRECT EXPLANATION of Assertion. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Assertion is true but Reason is FALSE. Both Assertion and Reason are false. Solution :Both Assertion and Reason are true and Reason is correct explanation of Assertion.

Discussion

20930.	Question : Assertion : Together with polysaccharides and polypeptiodes nucleic acid comprise the true macromolecular fraction of any living tissue or cell. Reason : Like polysaccharides and polypeptides nucleic acids also have molecularwieght more than 1000 dalton
Answer» If both ASSERTION & REASON are TURE & the Reason is a correct explanation of the Assertion If both Assertion & Reason ar True but Reason is not a correct EXPLANTATION of the Assertion If Assertion is True but the Reason is False If both Assertion & Reason are false Answer :A

Discussion

20931.	Question : Assertion : Tobacco contains a large number of alkaloids including nicotine. Reason : Nicotine stimulates adrenal glands which decrease blood pressure and increase heart rate.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :TOBACCO contains a large number of chemical SUBSTANCES including nicotine, an alkaloid. Nicotine stimulates adrenal gland to release adrenaline and nor- adrenaline into BLOOD, both of which raise blood pressure and increase heart RATE.

Discussion

20932.	Question : Assertion :- Together with polysaccharides and polypeptides nucleic acids comprise the true macromolecular fraction of any living tissue or cell. Reason :- Like polysaccharides and polypeptides nucleic acids also have molecular weight more than 1000 Dalton.
Answer» ANSWER :A

Discussion

20933.	Question : Assertion: Tobacco smoking is the main cause of lung cancer.Reason: Tobacco smoke has a carcinogen called nicotine.
Answer» If both ASSERTION and REASON are true and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :C

Discussion

20934.	Question : Assertion To make ATP from ADP and inoganic phosphate it requires it 30.6KJ
Answer» SOLUTION :(c)ATP is mobile and can carry energy to energy consuming process ANYWHERE in the cells.To make ATP from ADP and inorganic PHOSPHATE,it requires30.6 kJ of energy per mole.

Discussion

20935.	Question : Assertion :-Tissues of plants vary depending on their location in plant body. Reason :-On the basis of exclusively location tissues system is of three types.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False If both Assertion & Reason are false. Answer :C

Discussion

20936.	Question : Assertion: TMV is a rod-shaped virus. Reason: It is made up of protein coat annd RNA.
Answer» If both assertion and Reason are TRUE and the Reason is the correct EXPLANATION of the assertion. If both assertion and Reason are true but the reason is not the correct explanation of the assertion If assertion is true but reason is false If both assertion and reason are false. Solution :The protein COAT of TMV consiss of 2130 identical protein subunits called capsomeres.

Discussion

20937.	Question : Assertion : Through the use of catalytic converters, unburnt hydrocarbons are changed into carbon monoxide which in turn is changed into nitrogen oxides and water. Reason : Motor vehicles equipped with catalytic converters should use leaded petrol to protect the catalyst from degradation.
Answer» Solution :A catalytic converter is a vehicle emission control device that converts toxic pollutants of the exhaust gas into less toxic pollutants by catalysing a redox reaction. Catalytic converters, having expensive metals namely platinum-palladium and rhodium as the catalysts, are FITTED into automobiles for REDUCING emission of poisonous gases. Rhodium is used as reduction catalyst, palladium is used as an oxidation catalyst, and platinum is used both for oxidation and reduction. As the exhause passes through the catalytic converter, unburnt HYDROCARBONS are converted into carbon dioxide and WATER, and carbon monoxide and nitirc oxide are changed to carbon dioxide and nitrogen gas, respectively. Motor vehicle equipped with catalytic should USE unleaded pertol because lead in the pertol inactivates the catalyst.

Discussion

20938.	Question : Assertion: Three main types of restriction endonucleases, i.e., Type I, Type IT and Type ill are known with slightly different modes of action. Reason: In palindromes with rotational symmetry, second half of complementary strand in a DNA double helix is the mirror image of base sequence in the first half of another strand.
Answer» If both ASSERTION and Reason are TRUE and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :C

Discussion

20939.	Question : Assertion: Thorns and tendrils of Bougainvillea and Cucurbita represent homology. Reason: Homologous organs have similar functions but are different in their structural details and origin.
Answer» Solution :The ORGANS which have the asame fundamental STRUCTURE but are diffferent in functions are CALLED homologous organs. These organs follow the same basic plan of organisation during their developmentfor example, In plants. The homologous organs are thorn of Bougainvilea and a tendrill of Curculbita. both arising at the axiliary position.

Discussion

20940.	Question : Assertion :-Thoms are hard and rigid structures to protect from animals. Reason :-Thorns are woody and pointed structures
Answer» If both ASSERTION & REASON are True & the Reason is a correct EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False If both Assertion & Reason are false Answer :A

Discussion

20941.	Question : Assertion: Thick cuticle is mostly present in disease resistant plants. Reason: Disease causing agent
Answer» If both ASSERTION and reason are true and the reason is a CORRECT explanation of the assertion. If both assertion and reason are true but reason is not a correct explanation of the assertion. If the assertion is true but reason is FALSE. If both the assertion and reason are false. ANSWER :A

Discussion

20942.	Question : Assertion: There is an everlasting competition between individuals having similar requirements. Reason: Populations tend to multiply arithmetically while food and space increase geometrically.
Answer» If both Assertion and REASON are TRUE and the Reason is the CORRECT explanation of the Assertion If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :C

Discussion

20943.	Question : Assertion : There is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. Reason : Microoganisms ionvolved in biodegradation or organic matter in the receiving water body consume a lot of oxygen.
Answer» (a) Both, Assertion and Reason, are true and Reason is the correct explanation of Assertion (b) Both, Assertion and Reason, are true but Reason is not the correct explanation of Assertion (c) If Assertion is true but Reason is false (d) If Assertion is false but Reason is true Solution :Domestic sewage is rich in biodegradable organic matter and the decomposition of this organic matter by microorganisms require oxygen. Microorganisms involved in biodegradation of organic matter in the receiving WATER body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the POINT of sewage discharge. If sewage quantiy is large, the whole of dissolved oxygen MAY be consumed leaving nothing for respiration for fish and other clean water organisms. They, therefore, get killed. However, as sewage is decomposed, there is a gradual rise in dissolved oxygen downstream. Fish and other clean water organisms reappear indicating the RECOVERY of river from sewage pollution.

Discussion

20944.	Question : Assertion: The Y-chromosome is called androsome.Reason: X and Y-chromosomes differ in form and size.
Answer» If both Assertion and Reason are true and the Reason is the correct EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20945.	Question : Assertion :- The volume of air a person can expire after normal inspiration is TV = ERV Reason :- Volume of air that will remain in the lungs after a normal expiration is ERV = RV
Answer» If both ASSERTION & Reason are True & the Reasonn is a correct EXPLANATION of the Assertion . If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion If Assertion is True but the Reason is FALSE. If both Assertion & Reason are false. ANSWER :2

Discussion

20946.	Question : Assertion :- The volume of air a person can expire after normal inspiration is TV + ERV Reason:- Volume of air that will remain in the lungs after a normal expiration is ERV + RV
Answer» If both assertion and reason are TRUE and reasonis the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :B

Discussion

20947.	Question : Assertion: The type B spermatogonia are called primary spermatocytes. Reason: Primary spermatocytes complete the first meiotic division leading to secondary spermatocytes.
Answer» SOLUTION :N//A

Discussion

20948.	Question : Assertion: The third cleavage in frog is latitudinalReason: The mitotic spindle orients parallel to the polar axis.
Answer» If both ASSERTION and Reason are true and Reason is correct EXPLANATION of Assertion. If both Assertion and Reason are true but Reason is not correct explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :A

Discussion

20949.	Question : Assertion: The theory of survival of the fittest is widely misunderstood. Reason: Evolution does not always increase the chances of a species survival and species do not survive when such chances happen rapidly.
Answer» If both ASSERTION and REASON are true and the Reason is the correct EXPLANATION of the Assertion If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :C

Discussion

20950.	Question : Assertion :- The sun appears oval shape at sunrise. Reason :- At the time of sunrise sun appears a little before the actual sunrise
Answer» If both Assertion & Reason are TRUE & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion & Reason are False. Answer :B

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion: When embryo sac develops from magaspore mother cell, it is called diplospory, Reason: In diplospory, two spores are formed.

Question :Assertion :- Water uplifting in aerial parts of plant body have high tensile strength and capillarity. Reason:- Water have three main physical properties that is cohesion, adhesion and surface tension

Question : Assertion : Watson and Crick provided experimental proof of semiconservation nature of DNA relication.

Question : Assertion : Virus-infected cells secrete proteins known as interferons. Reason : Interferona protect the non-infected cells from bacterial infection.

Question : Assertion Viruses possess only a portion of theproperties of organisms. Reason Viruses are simpler thanbacteria.

Question : Assertion: Virus-free plants can be produced from virus infected plants by means of meristem tissue culture, Reason: The virus fails to grow during the growth of host tissue in the artificial medium.

Question : Assertion: Vigorous contraction of the uterus at the end of pregnancy causes expulsion. Reason: The stimulatory reflex between the uterine contraction and oxytocin secretion results in weakening contractions.

Question : Assertion Vegetarians may take infertile eggs produced by purely female stocks in which male chickens are not kept. Reason: Such eggs often called vegetarian eggs, are equivalent to milk in that both are animal products and do not produce life.

Question : Assertion: Vegetables are important part of healthy eating. Reason: Vegetables are succulent structures of plants with pleasant aroma and flavours.

Question : Assertion : Variety of fruit colours in Cucurbita pepo is result of recessive epistasis Reason : In recessive epistatsis, a recessive gene at one locus engances the expression of another gene, at a diferent locus.

Question : Assertion: Use of fertilisers greatly enhances crop productivity.Reason: Irrigation is very important in increasing crop productivity.

Question : Assertion: UV rays are carcinogenic in nature. Reason: It stimulates the growth of cancer.

Question : Assertion: Vaccination is also called preventive inoculation.Reason: A vaccine prevents the formation of antibodies inside the body.

Question :Assertion :- Upon the displacement of charges within a closed surface thevec Eat any point on surface doesn't change. Reason :- The flux crossing through closed surface depends of location of charge within the surface.

Question : Assertion : USA's patent of brazzein is an examoke of biopiracy Reason : Brazzein a protein obtained from West African plant, Pentadiplandra brazzeana and the gene encoding it has been patented by USA.

Question : Assertion :- Underground stem helps in perennation. Reason :- Underground stem can overcome adverse environmental conditions.

Question : Assertion :Untranslatedregions are sequences of RNA before initiation codonand after termination codon. Reason : Untranslated regionsprovide stability to mRNA and also increase translational efficiency.

Question : Assertion :-Underground stem hel p s in perennation. Reason :-Underground stem can overcome adverse environmental conditions.

Question : Assertion Two turns of Krebs cycle occur per glucose molecule used. Reason Each turn of Krebs cycle produces 3 NADH, IFADH_(2) and 1 ATP molecule.

Question : Assertion: Two chromatids remain held together at one point called centromere.Reason: Chromosome is double at all points along its length excluding centromere.

Question : Assertion :- Tubular is of considerable importance in Marine teleost fishes. Reason :- These fishes have no glomerular kidney .

Question : Assertion :tRNA recognises its corresponding codon in mRNA. Reason : For each codon, there is an individual tRNA.

Question : Assertion: Triticale is the most remarkable man-made cereal, joins the rank of cereals. Reason: The crop is not suited for bread making

Question : Assertion :- Transport proteins of root endodermal cells are control points of plant. Reason:- Transport proteins of root endodermal cells adjust the quantity and types of solutes that reach the xylem.

Question : Assertion : Transgenic plants having virus coat protein gene, express resistance to that virus and other related varieties Reason : Coat protein gene interferes with uncoating of viruses inside the plant cells.

Question : Asseration :Tracheal walls are supported by rings of cartilage. It helps in the free passage of air .

Question : Assertion : Together with polysaccharides and polypeptiodes nucleic acid comprise the true macromolecular fraction of any living tissue or cell. Reason : Like polysaccharides and polypeptides nucleic acids also have molecularwieght more than 1000 dalton

Question : Assertion : Tobacco contains a large number of alkaloids including nicotine. Reason : Nicotine stimulates adrenal glands which decrease blood pressure and increase heart rate.

Question : Assertion :- Together with polysaccharides and polypeptides nucleic acids comprise the true macromolecular fraction of any living tissue or cell. Reason :- Like polysaccharides and polypeptides nucleic acids also have molecular weight more than 1000 Dalton.

Question : Assertion: Tobacco smoking is the main cause of lung cancer.Reason: Tobacco smoke has a carcinogen called nicotine.

Question : Assertion To make ATP from ADP and inoganic phosphate it requires it 30.6KJ

Question : Assertion :-Tissues of plants vary depending on their location in plant body. Reason :-On the basis of exclusively location tissues system is of three types.

Question : Assertion: TMV is a rod-shaped virus. Reason: It is made up of protein coat annd RNA.

Question : Assertion: Thorns and tendrils of Bougainvillea and Cucurbita represent homology. Reason: Homologous organs have similar functions but are different in their structural details and origin.

Question : Assertion :-Thoms are hard and rigid structures to protect from animals. Reason :-Thorns are woody and pointed structures

Question : Assertion: Thick cuticle is mostly present in disease resistant plants. Reason: Disease causing agent

Question : Assertion: There is an everlasting competition between individuals having similar requirements. Reason: Populations tend to multiply arithmetically while food and space increase geometrically.

Question : Assertion : There is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. Reason : Microoganisms ionvolved in biodegradation or organic matter in the receiving water body consume a lot of oxygen.

Question : Assertion: The Y-chromosome is called androsome.Reason: X and Y-chromosomes differ in form and size.

Question : Assertion :- The volume of air a person can expire after normal inspiration is TV = ERV Reason :- Volume of air that will remain in the lungs after a normal expiration is ERV = RV

Question : Assertion :- The volume of air a person can expire after normal inspiration is TV + ERV Reason:- Volume of air that will remain in the lungs after a normal expiration is ERV + RV

Question : Assertion: The type B spermatogonia are called primary spermatocytes. Reason: Primary spermatocytes complete the first meiotic division leading to secondary spermatocytes.

Question : Assertion: The third cleavage in frog is latitudinalReason: The mitotic spindle orients parallel to the polar axis.

Question : Assertion: The theory of survival of the fittest is widely misunderstood. Reason: Evolution does not always increase the chances of a species survival and species do not survive when such chances happen rapidly.

Question : Assertion :- The sun appears oval shape at sunrise. Reason :- At the time of sunrise sun appears a little before the actual sunrise