22339 + Interview Questions in Biology in Class 11 Page 414 InterviewSolution

20651.	Question : Assertion: Bone has very hard matrix whereas cartilage has pliable matrix. Reason: Bone has calcium salts in its matrix whereas cartilage has chondroitin salts in its matrix.
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 :Bane is hard as its matrix has an inflexible meterialthe ossein. Matrix of the bone also contains calcium and magnesium SALT which also add in building rigidity of the tissue. Cartilage is SOFT and pliable as its matrix has a flexible material, the chondrin. Matrix of the cartilage chiefly consists of chondroitin sulphate, that is CAPABLE of withstanding considerable pressure.

Discussion

20652.	Question : Assertion : Birds have penumatic bones. Reason : Birds reduce their body weight for normal flight.
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

20653.	Question : Assertion : Biogeochemicals pass between non-living and living components of biosphere in a cyclic manner. Reason : Biogeochemicals are likely to exhaust one day.
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

20654.	Question : Assertion: Biceps and triceps are antagonistic muscles Reason: The biceps flexes the arm and the tr4iceps straightens the arm.
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 :Some muscle are arranged in sets of TWO and act in opposition to bring movement. Such muscles are called ANTAGONISTIC muscles. For example, the biceps bends or FLEXES the arm and its antagonist, the triceps straightens or extends the arm.

Discussion

20655.	Question : Which bacteria are involved in nitrogen fixation?
Answer»

Discussion

20656.	Question : Assertion : At incipient plasmolysis, water potential (Psi_w) is equal to solute potential (Psi_s).Reason : Psi_(w)=Psi_(m)+Psi_(s)+Psi_(p) At incipient plasmolysis the cell wall exerts no pressure on the wall contents and the pressure potential (Psi_p) is zero. The matric potential (Psi_m) is almost negligible. Thus Psi_(w)=Psi_(s) at incipient plasmolysis.
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

20657.	Question : Assertion: Atthe lung alveoli level , bloodreleases carbondioxide. Reason:Oxy Hb formedat the lung alveoli level acts as a weakacidwhichfavours release ofCO_(2) .
Answer» If both ASSERTION and Reason are trueand Reason is a correctexplaintionof Assertion . If both assertion and Reason are tureReason are tureReason is not a correct EXPLANATIONOF Assertion . If Assertion is ture but Reason is FALSE . If both assertionand Reason are false . Answer :C

Discussion

20658.	Question : Assertion. Ash analysis of a plant gives exact picture of the elements essentail for the plants. Reason. Roots take in some mineral nutrients selectively, only those which are essential for them.
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 :D

Discussion

20659.	Question : Assertion: Assimilotary power in photosynthesis is generated inETS occuring in thylakoid membrane . Reason : They are needed for CO_(2) reduction.
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

20660.	Question : Assertion : Artificial kidney operates on the principle of haemodialysis. Reason : Artificial kidneys involve both passive and active processes.
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 :C

Discussion

20661.	Question : Assertion: Androgens stimulate muscular growth. Reason: Androgens produce anabolic effects on protein and carbohydrate metablism.
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 :Androgens produce anabolic (synthetic) effects on protein and carbohydrate metabolism. This anabloic effect casue greatly increased depositon of protein everywhere in the body. But especially in the muscles. Androgens, therefore, stimulate muscular GROWTH.

Discussion

20662.	Question : Assertion. Anaerobicrespiration causes fatigue in humans. Reason. With rest, the fatigue disappearsdisappears.
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 :B

Discussion

20663.	Question : Assertion. An interphase cell has a diplosome near the nucleus. Reason. Diplosomes is not necessary for the formation of mitotic apparatus.
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

20664.	Question : Assertion. An exposed potato tuber develops chlorophyll and turns green. Reason. Potato tuber is a modified stem and its cells have ability to develop chlorophyll if exposed to light.
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

20665.	Question : What are essential elements?
Answer»

Discussion

20666.	Question : Assertion : Amphibians have thin, moist, glandular and vascular skin. Reason : Amphibians respire through their skin.
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

20667.	Question : Assertion : Alveoli are the primary sites for exchange of gases. Reason : All factors in our body are favourable for diffusion of O_(2) from alveoli to tissus and that of CO_(2) from tissues to alveoli.
Answer» If both ASSERTION and reason are true and reason is the correct explanation of assertion If both assertion and reason are true and reason is not the correct explanation of assertion If assertion is true but reason is false. If both assertion and reason are false. Solution :The solubility of the gases as well as the thickness of the membranes involved in diffusion are important factors that affect the rate of diffusion. A gradient of partial pressure is presen for oxygen from alveoli to blood and blood to tissue. Similarly, a gradient of `CO_(2)` is present in the opposite direction i.e, from tissues to blood and blood to alveoli. It is further dependent on the solubility of the diffusing gases. As the solubility of `CO_(2)` is `20-25` times higher than that of `O_(2)`, the amount of `CO_(2)` that can diffuse through the diffusion membrane per unit difference in partial pressure is MUCH higher compared to that of `O_(2)`. THEREFORE all the factors in our body are favourable for diffusion of `O_(2)` from alveoli to tissues and that of `CO_(2)` from tissues to alveoli. ALVEOLUS is the primary site of exchange as it has an extensive network of blood capillaries and consists of squamous epithelium. DUE to very intimate contact of blood capillaries with the alveoli, the exchange of gases takes place easily.

Discussion

20668.	Question : Assertion: All enzymes are amino acids. Reason: Proteins are formed of carboxylic 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 :D

Discussion

20669.	Question : Assertion : Algae float in water during daytime and sink during night because they became light due to consumption of food in respiration. Reason: The first stable product of carbon assimilation in C_3 plants is 3- phosphoglyceraldehyde.
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 :B

Discussion

20670.	Question : Assertion : Alcoholics generally suffer from dehydration. Reason : Alcohol increases the secretion of ADH which increases the water loss in urine.
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 :C

Discussion

20671.	Question : Assertion: Adrenal medullary hormones help in combating the stress condition. Reason: Both adrenaline and noradrenaline act on same organs and produce similar effects.
Answer» ANSWER :B

Discussion

20672.	Question : Assertion : Aerobicrespirationis bio-energetically moreefficientthan anaerobic respiration.Reason : Aerobic respirationtakes placein mitochondria,whereas anaerobic respiraitonoccursin cytoplasm.
Answer» If both ASSERTION and REASON are trueand Reason is a correctexplaintionof Assertion . If both assertion and Reason are tureReason are tureReason is not a CORRECT explanationof Assertion . If Assertion is TURE but Reason is false . If both assertionand Reason are false . ANSWER :B

Discussion

20673.	Question : Assertion: Adrenal cortex is not vital for survival and may be removed without subsequently leading to death. Reason: Adreanl cortex secretes a number of steroid hormones which have only cumulative effects on the hormones of other glands.
Answer» Solution :The outher layer of adrenal is CALLED adrenal corte. This part of adrenal is vitally important for the life and its destribution or removal kills the animal. It secrets a number of steroid HORMONES which are broadly classified into threegroups, viz. glucocorticids, mineralocorticoids and sex corticoids. fats and proteins, Mineralocorticoids REGULATE the BALANCE of water and electrolysis is our body. Sex corticoids STIMULATE the development of external sex characters.

Discussion

20674.	Question : Assertion: Action spectra for photosynthesis help to identify the pigment involved in the process. Reason: Because these spectra often closely match the adsoprtion spectra of the pigments that participate in the process.
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 and Reason are true but Reason is not a correct explanation of the Assertion. If Assertion is true but the Reason is false. Answer :A

Discussion

20675.	Question : Assertion : Action spectrum of Chl.a follow the absorption spectrum in photosynthesis.Reason: Cholorohyll can convert light energy into chemical energy.
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 :B

Discussion

20676.	Question : Assertion : Abscission zone in leaves is formed across the petiole near its junction with the stem. Reason :In many compound leaves, each leaflet also forms an abscission zone.
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

20677.	Question : Assertion. Acetylcholine transmits the nerve impulse across a synpase . Reason. Acetylcholine is secreted by adrenergic neurons.
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

20678.	Question : Assertion : According to Scarth, opening and closure of stomata is controlled by pH value.Reason : Low pH value favours opening of stomata and higher pH value closure of stomata.
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 :B

Discussion

20679.	Question : Assertion : ABO Blood grouping is based on multiple alleles. Reason : There are 6 possible genotypes and 4 possible blood types
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 :A

Discussion

20680.	Question : Assertion (A) : Water is not essential for fertilization in Angiosperms. Reason (R ) : Pollen tube helps in fertilization, so water is not essential for fertilization
Answer» (A) is CORRECT (R ) is WRONG (A) is wrong (R ) is correct (A) is correct and (R ) EXPLAINS (A) Both (A) and (R ) is wrong Answer :C

Discussion

20681.	Question : Assertion (A): The optimum temperature for photosynthesis varies from plant to plant. Reason (R): Optmum temperature for photosynthesis is 25^(@)C " to " 35^(@)C. This is not applicable for all plants. The ideal temperature for plants like opuntia is '55^(@)C"
Answer» Both (A) and (R) are WRONG (A) is CORRECT and (R) EXPLAINS (A) (A) is wrong and (R) is correct (A) is correct and (R) is wrong Solution :(A) is correct and (R) is wrong

Discussion

20682.	Question : Assertion (A) : The pigments chlorophyll 'a' and 'c' gives brown colour to the algae. Reason (R ) : Golden brown pigment called "Fucoxanthin" gives colour from olive green to brown .
Answer» (A) is WRONG But (R ) is CORRECT Both (A) and (R ) are correct Both (A) and (B)are wrong (A) is correct But (R ) is wrong Answer :A

Discussion

20683.	Question : Assertion: The environmental conditions of the tropics are favourable for speciation and diversity of organisms. Reason: The climate, seasons, temperature, humidity and photoperiod are more or less stable and congenial.
Answer» ANSWER :A::B::C::D

Discussion

20684.	Question : Assertion (A) : The decending limb of Henle's loop is permeable to water.Reason (R) : Aquaporins are the facilitators for water permeability..
Answer» (A) and (R) are wrong (R) does not explain (A) (R) is CORRECT andexplains (A) (A) is RIGHT (R) is wrong Answer :C

Discussion

20685.	Question : Assertion : A sigmoid curve is obtained when percentage saturation of haemoglobin with O_(2) is plotted against the PO_(2). Reason : Every 100 mL of oxygenated blood can deliver around 5mL of O_(2) to the tissues under normal physiological conditions.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true and reason is not the correct explanation of assertion If assertion is true but reason is false. If both assertion and reason are false. Solution :N//A

Discussion

20686.	Question : Assertion (A): RUBISCO-RUBP Carboxylase Oxygenase enzyme is the most abundant protein found on earth. Reason (R): RUBISCO constitutes 16% of the chloroplast protein. It acts are carboxylase in the presence of CO_(2) and Oxygenase in the absence of
Answer» Both (A) and (R) are WRONG (A) is CORRECT and (R) EXPLAINS (A) (A) is wrong and (R) is correct (A) is correct and (R) is wrong Solution :(A) is correct and (R) explains (A)

Discussion

20687.	Question : Assertion (A) : Respiration occur only in night time. Reason (R ): In respiration to convert food to energy ,plants use oxygen, and than carbon dioxideis released. Respiration and photosynthesis both occur during the day. However at night,only respiration occur which consumes oxygen.
Answer» Both (A) and (R ) are wrong (A) is CORRECT and (R ) EXPLAINS (A) (A) is correct (R ) is wrong (A ) is wrong (R ) is correct Answer :B

Discussion

20688.	Question : Assertion (A) : protoplasm theory exaplains nature and different properties of protoplasm. Reason (R ) : Cell size and shape different from type of tissue or organs and organisms.
Answer» (A) is CORRECT but (R ) does not EXPLAINS (R ) Both (A) and (R ) is WRONG Both (A) and (R ) are correct (R ) is correct and (A ) is wrong Answer :A

Discussion

20689.	Question : Assertion (A) : Pteridophytes considered as first true land plants. Reason (R ) : Pteridophytes were the first plant to acquire vascular tissue hence called vascular cryptogams.
Answer» Both (A) and (R ) are CORRECT Both (A) and (R ) are WRONG (A) is correct and ( R) is wrong (A) is wrong and (R ) is correct. Answer :A

Discussion

20690.	Question : Assertion (A) : Prophase I is the longest and most complex stage in meiosis. Resason (R ) : Prophase I is of longer duration and it is divided into 5 stages.
Answer» (A) is CORRECT but (R ) does not EXPLAINS (A) (A) is correct but (R ) is WRONG (A) and (R ) is wrong (A) is wrong and (R ) is correct ANSWER :A

Discussion

20691.	Question : Assertion (A): Photosynthesis balances the oxygen and carbon cycle in nature. Reason (R): Plants play a vital and important role in maintaining balance between oxygen and carbon dioxide. Plants takes CO_(2) from atmosphere in the process of photosy
Answer» Both (A) and (R) are WRONG (A) is CORRECT and (R) EXPLAINS (A) (A) is wrong and (R) is correct (A) is correct and (R) is wrong Solution :(A) is correct and (R) explains (A)

Discussion

20692.	Question : Assertion : A patient with kidney disorder needs to undergo dialysis at regular intervals. Reason : During dialysis, blood separated by selectively permeable membrane moves in the opposite direction to dialysing fluid containing small solutes and mineral ions but no excretory products.
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

20693.	Question : Assertion: A person undergoes fatigue very soon during exercies. Reason : Muscle fibres undergo oxygen debt during exercies.
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 :During strenous exercise, the muscle does not get sufficient OXYGEN to meet its energy requirement immediately. So, muscle CONTRACTS in the absence of oxygen. But it gets fatigued sooner in the absence of oxygen as the metabolic products of cellular respiration mainly lactic acid accumulates. The ACCUMULATION of lactic acid leads to muscle fatigue. After strenuous exercise, the oxygen consumption of muscle exceeds. The extra oxygen consumed during recovery is called debt of muscle. It is used in oxidizing the accumulated lactic acid aerobically and in restoring the depleted creatine phosphate and ATP in the muscle fibre. A small part of oxygen debt also goes to myoglobin which binds and stores oxygen for future use.

Discussion

20694.	Question : Assertion (A) : Oxidative phosphorylation takes place during the electron transport chain in mitochondria. Reason (R ) : Succinyl CoA is phosphorylated into succinic acid by substrate phosphorylation.
Answer» A and R is correct, R is correct EXPLANATION of A A and R is correct, but R is not the correct explanation of A A is correct but R is WRONG A and R is wrong ANSWER :B

Discussion

20695.	Question : Assertion (A) : Osteoporosis occurs due to deficiency of vitamin D and hormonal imbalance. Reason (R ) : It can be minimized with adequate calcium intake,vitamin D intake and regular physical activities.
Answer» (R ) is CORRECT but (A) is wrong (A) is correct and (R ) EXPLAINS (A) (A) is correct but (R ) is wrong Both (A) and (R )are Correct Answer :B

Discussion

20696.	Question : Asseration (A) : Large intestine also shows the presence of villi like small intestine. Reason (B) : Absorption of water
Answer» Both A and B are TRUE and B is the CORRECT EXPLANATION of A Both A and B are true but B is not the correct explanation of A A is true but B is false A is false but B is true Solution :N/A

Discussion

20697.	Question : Assertion (A): Increase in Proton gradient inside lumen reponsible for ATP synthesis Reason (R ): Oxygen evolving complex of PS I located on thylakoid membrane facing Stroma, releases H^+ ions
Answer» Both Assertion and Reason are TRUE. Assertion is True ANDREASON is False Reason is True Assertion is False Both Assertion and Reason are False Solution :Assertion is True andReason is False

Discussion

20698.	Question : Assertion (A):In sponges, the outer layer is formed of pinacocytes. Reason (R) : Pinacocytes are plate-like cells that maintain the size and structure of the sponge.
Answer» Both (A) and (R) are CORRECT (A) and (R) aer correct but (R) is not a correct EXPLANATION of the (A) (A) is correct, (R) is wrong Both (A) and (R) are wrong Answer :A::B::C::D

Discussion

20699.	Question : Assertion (A): ICBN (International code of Botanical Nomenclature ) redesignated as ICN and stands for International Code of Nomenclature for Algae,Fungi and Plants. Reason (R ) : Due to specific reason and to separate plant kingdom from other organism, ICBN redesignated as ICN.
Answer» Both (A) and (R ) are WRONG (A) is wrong and (R ) is CORRECT (A) is wrong and (R ) is correct (A) is correct and (R ) is wrong ANSWER :A::C

Discussion

20700.	Question : Assertion (A) : Growth is measurable. Reason ( R) : At a cellular level, growth simply means in the amount of protoplasm. One single maize root apical meristem can give rise to more than 17,500 new cells / hour, it is in terms of increase in cell number and cells in the watermelon can increase in size upto 3,50,000, here growth is measured in terms of size of the cells. Therefore Growth is measured in terms of increase in cell number, area, volume, lenght etc.
Answer» Both (A) and ( R) are WORNG (A) is CORRECT and (R ) explains (A) (A) is WRONG and (R ) is correct. (A) is correct and (R ) does not EXPLAIN (A) Answer :A::C::D

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion: Bone has very hard matrix whereas cartilage has pliable matrix. Reason: Bone has calcium salts in its matrix whereas cartilage has chondroitin salts in its matrix.

Question : Assertion : Birds have penumatic bones. Reason : Birds reduce their body weight for normal flight.

Question : Assertion : Biogeochemicals pass between non-living and living components of biosphere in a cyclic manner. Reason : Biogeochemicals are likely to exhaust one day.

Question : Assertion: Biceps and triceps are antagonistic muscles Reason: The biceps flexes the arm and the tr4iceps straightens the arm.

Question : Which bacteria are involved in nitrogen fixation?

Question : Assertion: Atthe lung alveoli level , bloodreleases carbondioxide. Reason:Oxy Hb formedat the lung alveoli level acts as a weakacidwhichfavours release ofCO_(2) .

Question : Assertion. Ash analysis of a plant gives exact picture of the elements essentail for the plants. Reason. Roots take in some mineral nutrients selectively, only those which are essential for them.

Question : Assertion: Assimilotary power in photosynthesis is generated inETS occuring in thylakoid membrane . Reason : They are needed for CO_(2) reduction.

Question : Assertion : Artificial kidney operates on the principle of haemodialysis. Reason : Artificial kidneys involve both passive and active processes.

Question : Assertion: Androgens stimulate muscular growth. Reason: Androgens produce anabolic effects on protein and carbohydrate metablism.

Question : Assertion. Anaerobicrespiration causes fatigue in humans. Reason. With rest, the fatigue disappearsdisappears.

Question : Assertion. An interphase cell has a diplosome near the nucleus. Reason. Diplosomes is not necessary for the formation of mitotic apparatus.

Question : Assertion. An exposed potato tuber develops chlorophyll and turns green. Reason. Potato tuber is a modified stem and its cells have ability to develop chlorophyll if exposed to light.

Question : What are essential elements?

Question : Assertion : Amphibians have thin, moist, glandular and vascular skin. Reason : Amphibians respire through their skin.

Question : Assertion : Alveoli are the primary sites for exchange of gases. Reason : All factors in our body are favourable for diffusion of O_(2) from alveoli to tissus and that of CO_(2) from tissues to alveoli.

Question : Assertion: All enzymes are amino acids. Reason: Proteins are formed of carboxylic acids.

Question : Assertion : Algae float in water during daytime and sink during night because they became light due to consumption of food in respiration. Reason: The first stable product of carbon assimilation in C_3 plants is 3- phosphoglyceraldehyde.

Question : Assertion : Alcoholics generally suffer from dehydration. Reason : Alcohol increases the secretion of ADH which increases the water loss in urine.

Question : Assertion: Adrenal medullary hormones help in combating the stress condition. Reason: Both adrenaline and noradrenaline act on same organs and produce similar effects.

Question : Assertion : Aerobicrespirationis bio-energetically moreefficientthan anaerobic respiration.Reason : Aerobic respirationtakes placein mitochondria,whereas anaerobic respiraitonoccursin cytoplasm.

Question : Assertion: Adrenal cortex is not vital for survival and may be removed without subsequently leading to death. Reason: Adreanl cortex secretes a number of steroid hormones which have only cumulative effects on the hormones of other glands.

Question : Assertion: Action spectra for photosynthesis help to identify the pigment involved in the process. Reason: Because these spectra often closely match the adsoprtion spectra of the pigments that participate in the process.

Question : Assertion : Action spectrum of Chl.a follow the absorption spectrum in photosynthesis.Reason: Cholorohyll can convert light energy into chemical energy.

Question : Assertion : Abscission zone in leaves is formed across the petiole near its junction with the stem. Reason :In many compound leaves, each leaflet also forms an abscission zone.

Question : Assertion. Acetylcholine transmits the nerve impulse across a synpase . Reason. Acetylcholine is secreted by adrenergic neurons.

Question : Assertion : According to Scarth, opening and closure of stomata is controlled by pH value.Reason : Low pH value favours opening of stomata and higher pH value closure of stomata.

Question : Assertion : ABO Blood grouping is based on multiple alleles. Reason : There are 6 possible genotypes and 4 possible blood types

Question : Assertion (A) : Water is not essential for fertilization in Angiosperms. Reason (R ) : Pollen tube helps in fertilization, so water is not essential for fertilization

Question : Assertion (A): The optimum temperature for photosynthesis varies from plant to plant. Reason (R): Optmum temperature for photosynthesis is 25^(@)C " to " 35^(@)C. This is not applicable for all plants. The ideal temperature for plants like opuntia is '55^(@)C"

Question : Assertion (A) : The pigments chlorophyll 'a' and 'c' gives brown colour to the algae. Reason (R ) : Golden brown pigment called "Fucoxanthin" gives colour from olive green to brown .

Question : Assertion: The environmental conditions of the tropics are favourable for speciation and diversity of organisms. Reason: The climate, seasons, temperature, humidity and photoperiod are more or less stable and congenial.

Question : Assertion (A) : The decending limb of Henle's loop is permeable to water.Reason (R) : Aquaporins are the facilitators for water permeability..

Question : Assertion : A sigmoid curve is obtained when percentage saturation of haemoglobin with O_(2) is plotted against the PO_(2). Reason : Every 100 mL of oxygenated blood can deliver around 5mL of O_(2) to the tissues under normal physiological conditions.

Question : Assertion (A): RUBISCO-RUBP Carboxylase Oxygenase enzyme is the most abundant protein found on earth. Reason (R): RUBISCO constitutes 16% of the chloroplast protein. It acts are carboxylase in the presence of CO_(2) and Oxygenase in the absence of

Question : Assertion (A) : Respiration occur only in night time. Reason (R ): In respiration to convert food to energy ,plants use oxygen, and than carbon dioxideis released. Respiration and photosynthesis both occur during the day. However at night,only respiration occur which consumes oxygen.

Question : Assertion (A) : protoplasm theory exaplains nature and different properties of protoplasm. Reason (R ) : Cell size and shape different from type of tissue or organs and organisms.

Question : Assertion (A) : Pteridophytes considered as first true land plants. Reason (R ) : Pteridophytes were the first plant to acquire vascular tissue hence called vascular cryptogams.

Question : Assertion (A) : Prophase I is the longest and most complex stage in meiosis. Resason (R ) : Prophase I is of longer duration and it is divided into 5 stages.

Question : Assertion (A): Photosynthesis balances the oxygen and carbon cycle in nature. Reason (R): Plants play a vital and important role in maintaining balance between oxygen and carbon dioxide. Plants takes CO_(2) from atmosphere in the process of photosy

Question : Assertion : A patient with kidney disorder needs to undergo dialysis at regular intervals. Reason : During dialysis, blood separated by selectively permeable membrane moves in the opposite direction to dialysing fluid containing small solutes and mineral ions but no excretory products.

Question : Assertion: A person undergoes fatigue very soon during exercies. Reason : Muscle fibres undergo oxygen debt during exercies.

Question : Assertion (A) : Oxidative phosphorylation takes place during the electron transport chain in mitochondria. Reason (R ) : Succinyl CoA is phosphorylated into succinic acid by substrate phosphorylation.

Question : Assertion (A) : Osteoporosis occurs due to deficiency of vitamin D and hormonal imbalance. Reason (R ) : It can be minimized with adequate calcium intake,vitamin D intake and regular physical activities.

Question : Asseration (A) : Large intestine also shows the presence of villi like small intestine. Reason (B) : Absorption of water

Question : Assertion (A): Increase in Proton gradient inside lumen reponsible for ATP synthesis Reason (R ): Oxygen evolving complex of PS I located on thylakoid membrane facing Stroma, releases H^+ ions

Question : Assertion (A):In sponges, the outer layer is formed of pinacocytes. Reason (R) : Pinacocytes are plate-like cells that maintain the size and structure of the sponge.

Question : Assertion (A): ICBN (International code of Botanical Nomenclature ) redesignated as ICN and stands for International Code of Nomenclature for Algae,Fungi and Plants. Reason (R ) : Due to specific reason and to separate plant kingdom from other organism, ICBN redesignated as ICN.