22339 + Interview Questions in Biology in Class 11 Page 411 InterviewSolution

20501.	Question : Assertion : Plants manufacture food only during the day time. Reason : During day time, metabolism is high.
Answer» If both ASSERTION and Reason are TRUE and the Reason is a correct EXPLANATION of the Assertion. If bothAssertion and Reason are true but Reason is not a correct explantion of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :C

Discussion

20502.	Question : Assertion :-Placentais connected tothefoetusby anumbilicalcord. Reason :- Foetalcomponentsof theplacentaare derivedfromthe chondriblast.
Answer» If bothAssertionand Reasonare trueandthe REASONIS acorrect EXPLANATION of theAssertion . IfbothAssertionand Reason are truebutReason isnotcorrect EXPLANATIONOF theAssertion . If Assertionistruebut theReasonis FALSE . If BothAssertionand ReasonArefalse Answer :C

Discussion

20503.	Question : Assertion : photosynthetic pathway is more efficient than the C_3pathway.Reason : Photorespiration is suppressed in C_3plants.
Answer» If both Assertion and REASON are true and Reason is CORRECT EXPLAINATION 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

20504.	Question : Assertion : Photorespiration retards the products of light reaction in photosynthesis. Reason: Chlorpphyll fails to absorb light in photorespiration.
Answer» If both ASSERTION and Reason are true and Reason is correct EXPLAINATION 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 :D

Discussion

20505.	Question : Assertion : Photomodulation of flowering is a phytochrome regulated process. Reason :Active form of phytochrome directly induces floral induction in shoot bud.
Answer» If both ASSETION 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 Assertion is true but the Reason is false If both Assertion and Reaon are false Answer :C

Discussion

20506.	Question : Assertion : Phospholipids are called amphipathic compounds . Reason : Each phospholipids is doubly charged compound .
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 Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :C

Discussion

20507.	Question : Assertion : Phenylketonuria occurs due to the mutation in gene PAH on chromosome 11. Reason : DOPA is not converted to melanin.
Answer» A and R are TRUE, R is the CORRECT EXPLANATIONOF A. A and R are true, R is not the correct EXPLANATION of A. A is true, R is false. Both A and R are false. Answer :D

Discussion

20508.	Question : Assertion :- Parthenogenesis is a kindorvariationof sexualreproduaction . Reason :- In parthengesis, a young onedevelopsfromand ovumbutwith fertilization
Answer» If bothAssertionand Reasonare trueandthe Reasonis acorrect explanation of theAssertion . IfbothAssertionand REASON are truebutReason isnotcorrect explanationof theAssertion . If Assertionistruebut theReasonis FALSE . If BothAssertionand ReasonArefalse ANSWER :a

Discussion

20509.	Question : Assertion: Oxytocin is called 'milk-ejection hormone' Reason: Oxytocin acts on the smooth muscles of uterus and stimulates its contraction. \
Answer» Solution :OXYTOCIN ACTS on the SMOOTH muscles of our body and stimulates their contraction, in females, it stimulates a vigorous contraction of uterusat the time of child birth, and mlk EJECTION from the mammary gland during suckiling.

Discussion

20510.	Question : Assertion: Oxyhaemoglobin dissociates near the organ tissue due to Bohr effect and oxygen is released. Reason: CO_(2) concentration reduced the affinity of haemoglobin for oxygen.
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 explanantion of the assertion. If the assertion is true but reason is FALSE. If both the assertion and reason are false. ANSWER :A

Discussion

20511.	Question : Assertion : Oxygendissociation curve of haemoglobin is sigmoid . Reason : Oxygen dissociationcurvemoves towardsleftside with increse in CO_(2)concentration inthe air.
Answer» If both ASSERTION and Reason are trueand Reason is a correctexplaintionof Assertion . If both assertion and Reason are true but Reason is not a correct EXPLANATIONOF Assertion . If Assertion is true but Reason is FALSE . If both assertionand Reason are false . Answer :C

Discussion

20512.	Question : Assertion : Oxidoreductases catalyze redox reactions . Reason : Isomerases catalyze the isomeric changes.
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 Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20513.	Question : Assertion: Oxidation of nutrients releases bond energy Reason : Oxidation of nutrients is done by using molecular oxygen.
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. ANSWER :B

Discussion

20514.	Question : Assertion :- Ovumretains mostof thecontents of theprimaryoocyte and ismuch largerthana spermatozoon. Reason:- Ovumneedsenergyto goaboutin searchof aspermarozoon forfertilization.
Answer» If bothAssertionand Reasonare trueandthe Reasonis acorrect EXPLANATION of theAssertion . IfbothAssertionand REASON are truebutReason isnotcorrect explanationof theAssertion . If Assertionistruebut theReasonis false . If BothAssertionand ReasonArefalse ANSWER :C

Discussion

20515.	Question : Assertion:on stimulation, a muscle cell releases calcium ions (Ca^(2+)) from sarcoplasmic reticulum. Reason: Byreacting with a protien complex, Ca^(2+) uncover active sites on the actin filaments.
Answer» If both assertion and REASON are ture and reason is the corect explanation of assertion If both assertion and reason are ture but reson is not the correct explanation of assertion If assertion is true reason is false If both assertion and reason are false Solution :A neural signal on reaching the nerromuscular junction RELEASES a neutrosmitter (acetylcholine) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcuim ions from sarcoplasmic reticulum into the sarcoplasm. INCREASE in `Ca^(2+)` level leads to the binding of calcium with a subunit of troponin on actin filaments and thereby removing the mask of active SITES for MYOSIN.

Discussion

20516.	Question : Assertion : One NADH_(2) yields three ATP molecules.Reason : For transfer over ETS, H^(+) atom dissociates into H^(+) and e^(-). During transfer of electrons at three stages ATP is generated over F_(0)-F_(1) complex.
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 a correct explanation of Assertion. If Assertion is true but Reason is FALSE. If both Assertion and Reason are false. Answer :A

Discussion

20517.	Question : Assertion : Oils have lower melting point . Reason : Oils mostly contain saturated fatty acids.
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 Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :C

Discussion

20518.	Question : Assertion : Nuclear energy can be produced only by fusionof certain elements. Reason : Nuclear reactions generated enomous energy.
Answer» If both the assertion and the reason are true and the reason is a correct EXPLANATION of the assertion If both the assertion and reason are ture but the reason is not a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false Solution :Nuclear ENERGY is OBTAINED from fusion or FISSION of atoms of certain elements. Nuclear fusion involves the fusion of the nuclei of two atoms instead of the splitting of atoms that occurs in nuclear fission. Nuclear REACTION consists of both fusion and fission of atom. The result is the release of enormous quantities of energy.

Discussion

20519.	Question : Assertion : Normal urine of man is hypertonic than the blood plasma. Reason : Counter-current mechanism of loop of Henle and Renin enzyme of juxta-glomerular cells increase the Na^(+) concentration in the adrenal medulla.
Answer» If both ASSERTION and REASON are TRUE and Reason is CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true but Reason is not correct explanation of the Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20520.	Question : Assertion: Neurohypophysis is under the direct regulation of the hypothalamus. Reason: Neurohypophysis stores and releases two hormones called oxytocin and vasopressin which are actually synthesised by the hypothalamus.
Answer» Solution :Neurohypohysis also known as posterior pituitary. Stores and RELEASES two HORMONES called OXYTOCIN and vasoprassin which are actually synthesised by the HYPOTHALAMUS and are tranported axonally to neurohypophysis. Therefore. The posterior pituitary is under the direct NEURAL regulation of the hypothalamus.

Discussion

20521.	Question : Assertion : Natural selection will help to produce variations Reason : The variations will help the organisms in times of disasters.
Answer» A is in the and R is the COVERED the EXPLANATION of A A and R RIGHT but R is not correct SEPARATION of A A is correct R is false Both A & B are false Answer :D

Discussion

20522.	Question : Assertion: National parks have been set up to protect wildlife. Reason: Biosphere reserves have greater importance than the national parks.
Answer» If both Assertion and REASON are true and 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 Assertion is true but Reason is TALSE. If both Assertion and Reason are FALSE. ANSWER :B

Discussion

20523.	Question : Assertion : Mutations produced every generation will accumulate over generations to produce a new species. Reason : Sudden and large variations cannot produce heritable changes.
Answer» A is in the and R is the covered the explanation of A A and R RIGHT but R is not correct separation of A A is correct R is false Both A & B are false Answer :D

Discussion

20524.	Question : Assertion: Muscle fibre is a syncitium. Reason: Muscle fibre has a large number of parallelly arraaged myofilaments in the sarcoplasm.
Answer» If both assertion and REASON are ture and reason is the corect explanation of assertion If both assertion and reason are ture but reson is not the correct explanation of assertion If assertion is true reason is false If both assertion and reason are false Solution :MUSCLE FIBRE is a syncitium as the sacroplasm contains many nuclei A characterstic feature of the muscle fibre is the PRESENCE of a large number of paralley arranged filaments in the sacroplasm called MYOFILAMENTS or myofibrils. Each myofibril has alternate dark and light bands on it.

Discussion

20525.	Question : Assertion : Muscle cells are also called myofibrils. Reason : Muscle cells are very thin and elongated.
Answer» If both the ASSERTION and the reason are true and the reason is a correct explanation of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion and reason are FALSE If the assertion is false but reason is true Solution :Regulation of RBCS PRODUCTION is accomplished by hormone erythropoietin which is secreted by kidney. This hormone increases stem cell mitosis and speed up RBC's devlopment in red bone marrow.

Discussion

20526.	Question : Assertion. Muscle and nerve cells greatly differ in structure and function. Reason. They contain different genetic information.
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 :C

Discussion

20527.	Question : Assertion. Motor nerve fibres that supply striped muscle and parasympathetic nerve fibrs which innervate smooth muscle are cholinergic . Reason. On stimulation, they secrete acetylcholine from their ends into the synpatic cleft.
Answer» If both A and R are TRUE and R is the CORRECT EXPLANATION of A. If both A and R are true and R is not the correct explanation of A. If A is true but R is false. If both A and R are false. Solution :N//A

Discussion

20528.	Question : Assertion most mineerlals must enter the rot by active absorption into the cytoplasm of epidermal cell Reason Thius transportation needs energy in the form of ATP some ions also move into the epidermal cells passively
Answer» If both Assertion and REASON are true and the Reason is a correct expanation of the Assertion If both AssertionandReason re true but REASONIS not a correct eplanatin of the Assertion If Assertion is truebut the Reason is FALSE If both Assertion and Reason are false ANSWER :a

Discussion

20529.	Question : Assertion : Mosses reduce the impact of falling rain and prevent soil erosion Reason : Mosses form dense mats on the soil.
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 but 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 :MOSSES reduce the impact of falling rain and prevent SOIL erosion as mosses from dense mats on the soil.

Discussion

20530.	Question : Assertion. Mitochondria and chloroplasts act as energy transducers in the cells. Reason. They make biologically useful energy available to the 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. Answer :B

Discussion

20531.	Question : Assertion : Metamorphosis in frog said to be progressive. Reason : Metamorphosis in frog is controlled by thyroxin hormone.
Answer» If both Assertion and REASON are TRUE and Reason is CORRECT explaination of Assertion If both Assertion and Reason are true but Reason is not correct explaination of Assertion If Assertion is true but Reason is false . If both Assertion and Reason are false. Answer :B

Discussion

20532.	Question : Assertion: Melatonin influences the menstrul cycle, Pigmentation and defense capability. Reason: Melatonin plays an important role in the regulation of diural rhythm of our body.
Answer» Solution :Melatonin (secreted by pineal gland) concentartion in the blood appears to follow a diumal (day-night) CYCLE as it rises in the evening and thorugh the night and drops to a low around noon. Because of this light MEDIATED response. The pineal gland may act as a KIND of blockgical clock's which may produce circadian RHYTHMS (variations following a 24 hour cycle). In addition, melatonin also influences metabloism. pigmentation, the menstural cycle as well as our defence capability.

Discussion

20533.	Question : Assertion: Mechanism of muscle contractionis expalained by sliding-filaments theory. Reason: Contraction of muscle fibre takes place by the sliding of thick filaments over the thin filaments.
Answer» If both ASSERTION and reason are ture and reason is the CORECT explanation of assertion If both assertion and reason are ture but reson is not the correct explanation of assertion If assertion is true reason is false If both assertion and reason are false Solution :Mechanism of muscle contraction is best explained by the sliding filament THEORY which states that contraction of a muscle fibre takes PLACE by the sliding of the thin filaments over the THICK filaments.

Discussion

20534.	Question : Assertion : Mating call is produced by male frog. Reason: Vocal sacs of male frog act as resonators.
Answer» If both ASSERTION and Reason are true and Reason ISA CORRECT EXPLANATION of Assertion If both Assertion and Reason are true but Reason is not a correct explanation of Assertion. If Assertion is true but Reason is False If both Assertion and Reason are false Answer :A

Discussion

20535.	Question : Assertion: Malehas deeper pitch of soundthanfemale . Reason : At puberty , sizeof larynx and vocalcords increasein male .
Answer» If both Assertion and REASON are trueand Reason is a correctexplaintionof Assertion . If both assertion and Reason are true butReason is not a CORRECT EXPLANATIONOF Assertion . If Assertion is true but Reason is false . If both assertionand Reason are false . ANSWER :A

Discussion

20536.	Question : Assertion : Malarial fever appear at merzoite stage of Plasmodium. Reason : The infective stage of Plasmodium is sporozoite.
Answer» If both the assertion and the reason ate true but the reason is not correct explanation of the assertion If both the assertion and the reason ate true and the reason is a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false Solution :When the mosquito bites man, sporozoites present in the salivary gland of female Anopheles mosquito are injected into the blood of the man. The erythrocytic schizont gives rise to merozoites. Malaria fever occurs when schizonts in red blood corpuscles burst and set FREE their contained merozoites and malarial pigment (HAEMOZOIN) in the blood plasma. Bursting of schizonts TENDS to be synchronous as they all burst at the same time. Haemozoin is said to be toxic and so includes high fever and shivering (Haemozion is an unused hematin, which is PRODUCED by the breakdown of HAEMOGLOBIN). It is yellow brown to blackish in colour.

Discussion

20537.	Question :Assertion : Maintenance of ratio between growth rates of different parts is called allometric growth. Reason: The growing shoot tip follows a helical path and the phenomenon is called circummutation.
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 the Reason is not a correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20538.	Question : Assertion: Lung fishes (e.g Protopterus) act as connecting link between fishes and amphibians. Reason : These have charactes of both fishes and amphibians.
Answer» If both ASSERTION and REASON are true and Reason is CORRECT explaination of Assertion If both Assertion and Reason are true but Reason is not correct explaination of Assertion If Assertion is true but Reason is FALSE . If both Assertion and Reason are false. Answer :A

Discussion

20539.	Question : Assertion : Loranthus is a partial parasite. Reason : Partial parasite depends on host for water& minerals only.
Answer» A is right, R is WRONG Both A and R are correct A is right R, explains A A is wrong R, explains A ANSWER :C

Discussion

20540.	Question : Assertion : Light plays an important role in process of transpiration.Reason : Light leads to opening of stomata and in dark stomata get closed.
Answer» If both ASSERTION and REASON are TRUE and Reason is CORRECT EXPLANATION of Assertions. 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

20541.	Question : Assertion: Light-harvesting complexes (LHC) on thylkoid membrane broaden the range of light absorption: Reason: They transfer electrons to reaction center.
Answer» If both ASSERTION and Reason are TRUE and the Reason is the CORRECT EXPLANATION 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. Answer :B

Discussion

20542.	Question : Assertion : Life occurs upto 15,000 metres on the mountains. Reason : Beyond 15,000 metres, temperature is too low, CO_(2) and O_(2) are too little.
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. If both A and R are false. Answer :A

Discussion

20543.	Question : Assertion. Leaves are pinnatifid in Poppy.Reason. Here incisions are less than half way from margin to mid rib.
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 Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20544.	Question : Assertion : LDH has five isoenzymes while alpha-amylase has sixteen isoenzymes. Reason: Isoenzymes perform same function but occur in more than one form.
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 Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20545.	Question : Assertion.Krebs cycle is regarded the amphibolic (central) pathway of the cell. Reason. Catabolic pathways converge on it and anabolicpathways diverge from it.
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. If both A and R are false. Answer :A

Discussion

20546.	Question : Assertion. Kidneys are retroperitoneal organs. Reason. Peritoneum covers the kidneys on all sides.
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. If both A and R are false. Answer :C

Discussion

20547.	Question : Assertion : It is possible to genetically engineer the organisms and produce vaccines . Reason : DNA vaccines are easy to produce .
Answer» A and R are true, R is the CORRECT EXPLANATION of A A and R are true , R is not the correct explanation of A A is true , R is false Both A and R are false Answer :A::C::D

Discussion

20548.	Question : Assertion : It is important to check senstivity of a patent before administering penicillin. Reason : Anred region in forearm can indicate that patent is allergic to penicllin.
Answer» If both A and R are TRUE and R is CORRECT EXPLANATION for A If both A and R are true butR is not correct explanation for A If A is true but R is false If both A and R are false Answer :A

Discussion

20549.	Question : Assertion: Interstitial fluid or tissue fluid has the same mineral distribution as that in plasma. Reason: Exchange of nutrients, gases, etc., between the blood and the cells always occurs through tissur fluid (lymph).
Answer» If both asseration and reason are true and the reason is the correct EXPLANATION of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true reason is FALSE. If both assertion and reason are false. Solution :Interstitial FLUID or tissue fluid has the same MINERAL distribution as that in PLASMA. Exchange of nutrents, gases, etc, between the blood and the cells always occurs through tissue fluid (lymph).

Discussion

20550.	Question : Assertion : Intake of excess of saturated fats should be avoided. Reason : Saturated fats change into cholesterol which causes arteriosclerosis.
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 Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion : Plants manufacture food only during the day time. Reason : During day time, metabolism is high.

Question : Assertion :-Placentais connected tothefoetusby anumbilicalcord. Reason :- Foetalcomponentsof theplacentaare derivedfromthe chondriblast.

Question : Assertion : photosynthetic pathway is more efficient than the C_3pathway.Reason : Photorespiration is suppressed in C_3plants.

Question : Assertion : Photorespiration retards the products of light reaction in photosynthesis. Reason: Chlorpphyll fails to absorb light in photorespiration.

Question : Assertion : Photomodulation of flowering is a phytochrome regulated process. Reason :Active form of phytochrome directly induces floral induction in shoot bud.

Question : Assertion : Phospholipids are called amphipathic compounds . Reason : Each phospholipids is doubly charged compound .

Question : Assertion : Phenylketonuria occurs due to the mutation in gene PAH on chromosome 11. Reason : DOPA is not converted to melanin.

Question : Assertion :- Parthenogenesis is a kindorvariationof sexualreproduaction . Reason :- In parthengesis, a young onedevelopsfromand ovumbutwith fertilization

Question : Assertion: Oxytocin is called 'milk-ejection hormone' Reason: Oxytocin acts on the smooth muscles of uterus and stimulates its contraction. \

Question : Assertion: Oxyhaemoglobin dissociates near the organ tissue due to Bohr effect and oxygen is released. Reason: CO_(2) concentration reduced the affinity of haemoglobin for oxygen.

Question : Assertion : Oxygendissociation curve of haemoglobin is sigmoid . Reason : Oxygen dissociationcurvemoves towardsleftside with increse in CO_(2)concentration inthe air.

Question : Assertion : Oxidoreductases catalyze redox reactions . Reason : Isomerases catalyze the isomeric changes.

Question : Assertion: Oxidation of nutrients releases bond energy Reason : Oxidation of nutrients is done by using molecular oxygen.

Question : Assertion :- Ovumretains mostof thecontents of theprimaryoocyte and ismuch largerthana spermatozoon. Reason:- Ovumneedsenergyto goaboutin searchof aspermarozoon forfertilization.

Question : Assertion:on stimulation, a muscle cell releases calcium ions (Ca^(2+)) from sarcoplasmic reticulum. Reason: Byreacting with a protien complex, Ca^(2+) uncover active sites on the actin filaments.

Question : Assertion : One NADH_(2) yields three ATP molecules.Reason : For transfer over ETS, H^(+) atom dissociates into H^(+) and e^(-). During transfer of electrons at three stages ATP is generated over F_(0)-F_(1) complex.

Question : Assertion : Oils have lower melting point . Reason : Oils mostly contain saturated fatty acids.

Question : Assertion : Nuclear energy can be produced only by fusionof certain elements. Reason : Nuclear reactions generated enomous energy.

Question : Assertion : Normal urine of man is hypertonic than the blood plasma. Reason : Counter-current mechanism of loop of Henle and Renin enzyme of juxta-glomerular cells increase the Na^(+) concentration in the adrenal medulla.

Question : Assertion: Neurohypophysis is under the direct regulation of the hypothalamus. Reason: Neurohypophysis stores and releases two hormones called oxytocin and vasopressin which are actually synthesised by the hypothalamus.

Question : Assertion : Natural selection will help to produce variations Reason : The variations will help the organisms in times of disasters.

Question : Assertion: National parks have been set up to protect wildlife. Reason: Biosphere reserves have greater importance than the national parks.

Question : Assertion : Mutations produced every generation will accumulate over generations to produce a new species. Reason : Sudden and large variations cannot produce heritable changes.

Question : Assertion: Muscle fibre is a syncitium. Reason: Muscle fibre has a large number of parallelly arraaged myofilaments in the sarcoplasm.

Question : Assertion : Muscle cells are also called myofibrils. Reason : Muscle cells are very thin and elongated.

Question : Assertion. Muscle and nerve cells greatly differ in structure and function. Reason. They contain different genetic information.

Question : Assertion. Motor nerve fibres that supply striped muscle and parasympathetic nerve fibrs which innervate smooth muscle are cholinergic . Reason. On stimulation, they secrete acetylcholine from their ends into the synpatic cleft.

Question : Assertion most mineerlals must enter the rot by active absorption into the cytoplasm of epidermal cell Reason Thius transportation needs energy in the form of ATP some ions also move into the epidermal cells passively

Question : Assertion : Mosses reduce the impact of falling rain and prevent soil erosion Reason : Mosses form dense mats on the soil.

Question : Assertion. Mitochondria and chloroplasts act as energy transducers in the cells. Reason. They make biologically useful energy available to the cells.

Question : Assertion : Metamorphosis in frog said to be progressive. Reason : Metamorphosis in frog is controlled by thyroxin hormone.

Question : Assertion: Melatonin influences the menstrul cycle, Pigmentation and defense capability. Reason: Melatonin plays an important role in the regulation of diural rhythm of our body.

Question : Assertion: Mechanism of muscle contractionis expalained by sliding-filaments theory. Reason: Contraction of muscle fibre takes place by the sliding of thick filaments over the thin filaments.

Question : Assertion : Mating call is produced by male frog. Reason: Vocal sacs of male frog act as resonators.

Question : Assertion: Malehas deeper pitch of soundthanfemale . Reason : At puberty , sizeof larynx and vocalcords increasein male .

Question : Assertion : Malarial fever appear at merzoite stage of Plasmodium. Reason : The infective stage of Plasmodium is sporozoite.

Question :Assertion : Maintenance of ratio between growth rates of different parts is called allometric growth. Reason: The growing shoot tip follows a helical path and the phenomenon is called circummutation.

Question : Assertion: Lung fishes (e.g Protopterus) act as connecting link between fishes and amphibians. Reason : These have charactes of both fishes and amphibians.

Question : Assertion : Loranthus is a partial parasite. Reason : Partial parasite depends on host for water& minerals only.

Question : Assertion : Light plays an important role in process of transpiration.Reason : Light leads to opening of stomata and in dark stomata get closed.

Question : Assertion: Light-harvesting complexes (LHC) on thylkoid membrane broaden the range of light absorption: Reason: They transfer electrons to reaction center.

Question : Assertion : Life occurs upto 15,000 metres on the mountains. Reason : Beyond 15,000 metres, temperature is too low, CO_(2) and O_(2) are too little.

Question : Assertion. Leaves are pinnatifid in Poppy.Reason. Here incisions are less than half way from margin to mid rib.

Question : Assertion : LDH has five isoenzymes while alpha-amylase has sixteen isoenzymes. Reason: Isoenzymes perform same function but occur in more than one form.

Question : Assertion.Krebs cycle is regarded the amphibolic (central) pathway of the cell. Reason. Catabolic pathways converge on it and anabolicpathways diverge from it.

Question : Assertion. Kidneys are retroperitoneal organs. Reason. Peritoneum covers the kidneys on all sides.

Question : Assertion : It is possible to genetically engineer the organisms and produce vaccines . Reason : DNA vaccines are easy to produce .

Question : Assertion : It is important to check senstivity of a patent before administering penicillin. Reason : Anred region in forearm can indicate that patent is allergic to penicllin.

Question : Assertion: Interstitial fluid or tissue fluid has the same mineral distribution as that in plasma. Reason: Exchange of nutrients, gases, etc., between the blood and the cells always occurs through tissur fluid (lymph).

Question : Assertion : Intake of excess of saturated fats should be avoided. Reason : Saturated fats change into cholesterol which causes arteriosclerosis.