22339 + Interview Questions in Biology in Class 11 Page 409 InterviewSolution

20401.	Question : Assertion: Under condition of high light intensity and limited CO_(2) supply, photorespiration has a useful role in protecting the plants from photooxidative damage. Reason: If enough CO_(2) is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.
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 :C

Discussion

20402.	Question : Assertion : Ubiquinone is non - protein coenzyme.Reason : Ubiquinone acts as an activator in ETS.
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 :C

Discussion

20403.	Question : Assertion: Ulna is logner than radius. Reason: It has large olecranon process.
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 :Ulna is longer than radius. Its upper end has a larger olecranon process that FORMS the EMINENCE of our elbow. The head of the radius ARTICULATE with the humerus.

Discussion

20404.	Question : Assertion : Two ATP molecules are produced during anaerobic respiration.Reason : Glucose is converted into pyruvic acid through a series of reactions with net gain of two ATP molecules.
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 :B

Discussion

20405.	Question : Assertion : Tubular secretion is more important in marine fishes and desert amphibians. Reason : In marine fishes and desert amphibians, nephrons are aglomerular.
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

20406.	Question : Assertion. Tubular secretion alone accpunts for excretion in the desert amphibians. Reason. Desert amphibians have abundant Bowman's capsules and glomeruli.
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

20407.	Question : Assertion : Tracheae, primary, secondary and tertiary bronchi are supported by incomplete carilaginous rings. Reason : These rings of carilage make the wall non-collapsible.
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

20408.	Question : Assertion: Thyroid hormones promote physical growth and development of mental faculties. Reason: Hypothyroidism in adults causes retarded sexual development.
Answer» Solution :Thyroid hormones STIMULATE protein synthesis and, therefore, PROMOTE growth of the body tissues (physicaldevelopment).They also regulate the development of mental faculties. Hyperthyroidsm in adults causes myxoedema. This disease is CHARACTERISED by PUFFY appearance due to accumulation of fat in the subcutaneous tissue because of low metabolic rate. The patient lacks alertness, intelligence and intiative He also suffers from SLOW heart beat, lwo body temperature and retarded sexual development.

Discussion

20409.	Question : Assertion. There is no net exchange of gases at compensation point. Reason. Photosynthesis andrespiration stop at compensation point.
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

20410.	Question : Assertion : Thigh muscle can get thired but not the muscles ventricle of heart. Reason : Muscles of thigh are voluntary whereas that of heart are involuntary muscles.
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 :The THIGH muscle are the striated muscle which soon get fatigued due to overwork. These muscle show fast contractions and then tire immediately due to accumulation of LACTIC acid. The muscle of heart wall are the CARDIAC muscles which are unfatiguable and show rhythmic and AUTOMATIC contractions. They have specialised regions of the cell membranes which function as boosters for muscle contraction waves. Thigh muscles are called voluntary muscle because they can be moved at the will of organism whereas heart mucsles can't be moved at one's will and THEREFORE are involuntary.

Discussion

20411.	Question : Assertion. There is large deposition of lignin in the lumen of tracheids. Reason. The lumen of tracheids is narrow.
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

20412.	Question : Assertion: The whole scheme of transfer of electrons, starting from the PS II uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally downhill to NADP^(+) causing it to be reduced to NADPH^(+) H^(+)~ is called the Z scheme or cyclic photophosphorylation. Reason: Both ATP and NADH + H^(+) are synthesised by this kind of electron flow.
Answer» If both assertion and reason are true and the reason 1s 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 but reason is false. If both assertion and reason are false. Solution :The whole scheme of transfer of electrons, starting from the PS II uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally downhill to NADP causing it to be reduced to `NADPH+H^(+)` is called the Z scheme or non-cyclic photophosphorylation. Both ATP and NADPH are SYNTHESISED by this kind of electron FLOW.

Discussion

20413.	Question : Assertion : There are 4 carbon atoms in an oxaloacetic acid molecule, which joins with an acetyl group during step 1 Krebs' Citric acid cycle.Reason : There are 6 carbon atoms in citric acid molecule.
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

20414.	Question : Assertion: the tRNA decodes the information on mRNA. Reason: It has an extra arm:
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 B are false Answer :B

Discussion

20415.	Question : Assertion :- thethird cleavagein frogis latitudinal(horizontal ) . Reason :- Themitoticspindleorientsparallelto the polaraxisin eachblastomere
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

20416.	Question : Assertion. The terminal meristem present at the apices of stems and roots is called apical meristem. Reason. According to Histogen theory, there are three distinct apical layers which give rise to distinct tissue system of the body.
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 Assertionand Reason are false Answer :a

Discussion

20417.	Question : Assertion : The spread of living pteridophyte is limited and restricted to narrow geographical regions Reason : Prothallus require cool, damp, shady places to grow and water is required for fertilisation.
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 :The spread of living pteridophytes is LIMITED and restricted to narrow GEOGRAPHICAL regions because PROTHALLUS requires cool, damp, shady places to grow and water is required for fertilisation.

Discussion

20418.	Question : Assertion : The sequence of dark reaction of photosynthesis was discovered by Robin Hill Reason: The principle of limiting factor was proposed by Calvin.
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

20419.	Question : Assertion : The role of phycobilins in photosynthesis is to absorb and transfer energy to chlorophyllReason: Phycobilins act as necessary pigments and transfer energy to primary pigments i.e chlorophyll
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

20420.	Question : Assertion : The role of chlorophyll in photosynthesis is absorption of light and photolysis of water.Reason : The function of solar energy is assimilation of CO_2
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 :C

Discussion

20421.	Question : Assertion: The resin duct in coniferales is schizogenous in origin. Reason: Resin duct helps to retain water as well as seals the injured areas of plants.
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

20422.	Question : Assertion : The rate of respiration is reduced during storage of green at low temperature.Reason : At low temperature, lot of CO_(2) is produced thereby reducing the metabolism.
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 :C

Discussion

20423.	Question : Assertion. The radial walls of endodermal cells possess a conspicuous waxy thickening called Casperian strip. Reason. Casparian thickenings block the passage of solute from one side of endodermis to the other via cell wall route.
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 Assertionand Reason are false ANSWER :A

Discussion

20424.	Question : Assertion : The process of oogenesis must get completed before fertilization Reason : The egg after II Meiosis is ready for fertilization.
Answer» A and RARE 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 :D

Discussion

20425.	Question : Assertion : The primary germ layers are formed during gastrulation. Reason: The body organs are formed from primary germ layers.
Answer» A and Rare 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

Discussion

20426.	Question : Assertion: The portion of the myofibril between two successive Z-lines is considered as the functional unit of contraction called sarcomere. Reason: During contraction, l-bands get reduced whereas A-bands retain the length , thereby causing shortening of the sarcomere.
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 :Each myofibril contains actin and myosin filaments which give it striated appearance due to dark and light bands. The lights band whereas the dark bands are called 'A' or ANISOTROPIC bands the contain myosin. Both the PROTEINS are arranged as ROD like structures, parallel to each other and also to the longitudinal axis of the myofibirals. In the centre of each I-band is an elastic fibre called Z - line which bisects it. The PORTION of the myofibrial between two successive Z-lines is considered as the functional unit of contraction and is called a sarcomere. During contraction, the Z-lines attached to the actins are pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction. Hence during shortening of the muscle, i.e., contraction, the I-bands get reduced, whereas the A-bands retain the length

Discussion

20427.	Question : Assertion : The photosynthetic, floating protists are collectively called phytoplanktons. Reason : The free floating holozoic protozons are collectively termed zooplanktons.
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 TURE but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20428.	Question : Assertion : The organization of an ecosystem depends on richness of biodiversity. Reason: Biodiversity helps to maintain balance between biotic components.
Answer» If both A and R are TRUE and R is CORRECT explanation for A. If both A and R are truebut R is not the correct explanation for A. If A is true but R is false. If both A and R are false. ANSWER :A

Discussion

20429.	Question : Assertion : The nest of Dischidia is a modified structure of root . Reason : Nest roots absorb water and food from humusrich soil collected in nest.
Answer» If both Assertion and REASON are TRUE and the Rea-son is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Rea-son is not the correct explanation of the Assertion. If Assertion is true, but Reason is false. IfAssertion is false and Reason is right Answer :A

Discussion

20430.	Question : Assertion : The lungs are situated in thoracic chamber which is anatomically an air-tighlt chamber. Reason : Such an arrangement is essential to avoid an change in pulmonary volume.
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 lungs are situated in the thoracic chamber which is ANATOMICALLY an air-tight chamber. The ANATOMICAL setup of lungs in thorax is such that any change in the VOLUME of the thoracic cavity will be refleted in the lungs (pulmonary) cavity. Such as ARRANGEMENT is essential for breathing, as we cannot directly ALTER the pulmoanry volume.

Discussion

20431.	Question : Assertion : The leaves in gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind Reason : In conifers, the needle-like leaves reduce the surface area. Their thick cuticle and sucken stomata also help to reduce water loss.
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 :The leaves in gymnosperms are well-adapted to withstand extremes of TEMPERATURE, humidity and wind. In conifers, the neddle-like leaves REDUCE the SURFACE area. Their thick cuticle and sunken STOMATA ALSO help to reduce water loss.

Discussion

20432.	Question : Assertion. The leaflet of a compound leaf is not a true leaf. Reason. There is no bud in the axil of a leaflet.
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

20433.	Question : Mark the correct answer as Assertion (A): The Kappa in paramecium appears to be a bacterium Reason (R): Kappa particles are not dependent on the chromosomal genes.
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 :C

Discussion

20434.	Question : Assertion: The joint between the atlas and axis is an example of gliding joint. Reason: Gliding joint allows movement primarily in one plane.
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 gliding joint permits back -and-forth and side to side movements. No rotation or twisting is possible because ligaments. Gliding joints are found between the carpal bones and between the TARSAL bones. The joint between the ATLAS and axis is an example of pivot joint.

Discussion

20435.	Question : Assertion : The hormone aldosterone increases the reabsorption of Na^(+) by the nephron and the excretion of K^(+). Reason : To maintain the pH of blood and body fluids, the kidneys secrete H^(+) and NH_(4)^(+).
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 :B

Discussion

20436.	Question : Assertion : In membrane the concentration of Na^(++) and K^(+), and proteins generates action potential. Reason : To maintain the unequal distribution of Na^(+) and K^(+), the neurons use electrical energy.
Answer» Both ASSERTION and REASON are true and Reason is the CORRECT EXPLANATION of the Assertion. Both Assertion and Reason are true but the Reason is not the correct explanations 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 the correct explanation of the Assertion.

Discussion

20437.	Question : Assertion. The fruits of groundnuts are not nuts but underground pods. Reason. The pods will not develop until the fertilized ovary is pushed under the soil.
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

20438.	Question : ASSERTION: - Fat is restricted in the diet of a person who has undergone an operation to remove gall bladder.REASONS: - The gall bladder stores lipases which are released in small intestine for digestion.
Answer» a) If both assertion and reason are true and reason is the correct EXPLANTION of assertion b)If both assertion and reason are true but reason is not the correct explnantion of assertion. c) If assertion is true but reason is false. d) If both assertion and reason are false. Solution :The GALL BLADDER stores bile which is released for the emulsification of fats thus HELPING in fat DIGESTION.

Discussion

20439.	Question : Assertion. The final reabsorption of water from the urine into the blood occurs through the collecting duct of a mammalian nephron resulting in the production of hyperosmotic urine. Reason. The loop of Henle creates a sodium gradient in the interstitial fluid from the renal medulla towards the renal cortex.
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

20440.	Question : Assertion: The estrogen level falls after menopause. Reason: The estrogen is synthesised and secreted mainly by uterine lining.
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 :The estrogen is synthesised and secreted MAINLY by the GROWING ovarian folliciles. Menopause is the time in a woman's life when the ovaries CEASE to produce an EGG every month. Therefore, menstruation ceases gradually. This may happen because both the ovaries, by menopause, have run out of ovarian follicles, so, menopasue may begin when no follicles are left in the ovaries without developing follicles, there is a reduced supply of estrogen and progesterone.

Discussion

20441.	Question : Assertion : The dark reaction in photosynthesis is called because it does not require light energy. Reason: Dark reaction occurs more rapidly in night.
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 :C

Discussion

20442.	Question : Assertion: Thecompanion cells help in maintaining the pressue gradient in sieve tube Reasons: The companion cells are specialished parenchymatous cells which are closely associated with sieve tube elements
Answer» Solution :The COMPANION CELLS help in maintaining the PRESSURE gradient in sieve TUBE. The compannion cells are speicialised parenchymatous cells, which are closely associateed with sieve tube ELEMENTS

Discussion

20443.	Question : Assertion. The choroid plexuses have little significance as nervous centres. Reason. The choroid plexuses are composed of piamater (connective tissue) lined by the cuboidal epithelium secretory nature.
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

20444.	Question : Assertion: The best quality of pearl is known as lingha pearl and obtained from marine oysters. Reason: Nacre is secreted continuously by the epithelial layer of the mantle and deposited around the foreign particle.
Answer» Assertion is true, REASON is FALSE Assertion and Reason are false Assertion is false But Reason is true Assertion and Reason are true Solution :Assertion is false But Reason is true

Discussion

20445.	Question : Assertion : The artificial systems gave equal weightage to vegetative and sexual characteristics , this is not acceptable Reason : Vegetative characters are more easily affected by environment.
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 :The artificial systems gave EQUAL weightage to vegetative and sexual characteristics , this is not acceptable because vegetative characters are more easily AFFECTED by ENVIRONMENT.

Discussion

20446.	Question : Assertion: The apical meristem is always protected. Reason: A root cap is present above the meristem in roots.
Answer» If both Assertin and REASON are true and the Reason is the CORRECT explanatin 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, Reason is FALSE. If both Assertion and Reason are true. Answer :B

Discussion

20447.	Question : Assertion : The acid soluble pool represents roughly the cytoplasmic composition. Reason : The macromolecules from cytoplasm and organelles become the acid insoluble fraction.
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 reason is false If both assertion and reason are false Solution :(B) The acid soluble pool REPRESENTS ROUGHLY the cytoplasmic COMPOSITION. The macromolecules from cytoplams and ORGANELLES become the acid insoluble fraction.

Discussion

20448.	Question : Assertion :-Testesare locatedin the scrotumoutsidethecoelom, Reason :-A vaginalcoelompartlysurrounds the testisin thescrotum .
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

20449.	Question : Assertion: Tetany is rapid spasm in muscle. Reason: Tetany is usually caused by an increases in the blood calcium level.
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 reason is false If both assertion and reason are false Solution :Tetany is a spasm and twitching of the muslces, particularly of face, hands and FEET. Rapid spasms (wild contraction) in muscle is DUE to LOW `CA^(2+)` in body fluid which may be due to underactive parathyroid gland.

Discussion

20450.	Question : Assertion: Terminal oxidation occurs both in aerobic and anaerobic condtions. Reason: Terminal oxidation occurs at terminal step of respiration.
Answer» Solution :Terminal OXIDATION is the name of oxidation found in AEROBIC respiration that occurs towards the end of catabloic PROCESS and involves the passage of both electrons and PROTONS of reduced COENZYMES to oxygen.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion : Ubiquinone is non - protein coenzyme.Reason : Ubiquinone acts as an activator in ETS.

Question : Assertion: Ulna is logner than radius. Reason: It has large olecranon process.

Question : Assertion : Two ATP molecules are produced during anaerobic respiration.Reason : Glucose is converted into pyruvic acid through a series of reactions with net gain of two ATP molecules.

Question : Assertion : Tubular secretion is more important in marine fishes and desert amphibians. Reason : In marine fishes and desert amphibians, nephrons are aglomerular.

Question : Assertion. Tubular secretion alone accpunts for excretion in the desert amphibians. Reason. Desert amphibians have abundant Bowman's capsules and glomeruli.

Question : Assertion : Tracheae, primary, secondary and tertiary bronchi are supported by incomplete carilaginous rings. Reason : These rings of carilage make the wall non-collapsible.

Question : Assertion: Thyroid hormones promote physical growth and development of mental faculties. Reason: Hypothyroidism in adults causes retarded sexual development.

Question : Assertion. There is no net exchange of gases at compensation point. Reason. Photosynthesis andrespiration stop at compensation point.

Question : Assertion : Thigh muscle can get thired but not the muscles ventricle of heart. Reason : Muscles of thigh are voluntary whereas that of heart are involuntary muscles.

Question : Assertion. There is large deposition of lignin in the lumen of tracheids. Reason. The lumen of tracheids is narrow.

Question : Assertion : There are 4 carbon atoms in an oxaloacetic acid molecule, which joins with an acetyl group during step 1 Krebs' Citric acid cycle.Reason : There are 6 carbon atoms in citric acid molecule.

Question : Assertion: the tRNA decodes the information on mRNA. Reason: It has an extra arm:

Question : Assertion :- thethird cleavagein frogis latitudinal(horizontal ) . Reason :- Themitoticspindleorientsparallelto the polaraxisin eachblastomere

Question : Assertion. The terminal meristem present at the apices of stems and roots is called apical meristem. Reason. According to Histogen theory, there are three distinct apical layers which give rise to distinct tissue system of the body.

Question : Assertion : The spread of living pteridophyte is limited and restricted to narrow geographical regions Reason : Prothallus require cool, damp, shady places to grow and water is required for fertilisation.

Question : Assertion : The sequence of dark reaction of photosynthesis was discovered by Robin Hill Reason: The principle of limiting factor was proposed by Calvin.

Question : Assertion : The role of phycobilins in photosynthesis is to absorb and transfer energy to chlorophyllReason: Phycobilins act as necessary pigments and transfer energy to primary pigments i.e chlorophyll

Question : Assertion : The role of chlorophyll in photosynthesis is absorption of light and photolysis of water.Reason : The function of solar energy is assimilation of CO_2

Question : Assertion: The resin duct in coniferales is schizogenous in origin. Reason: Resin duct helps to retain water as well as seals the injured areas of plants.

Question : Assertion : The rate of respiration is reduced during storage of green at low temperature.Reason : At low temperature, lot of CO_(2) is produced thereby reducing the metabolism.

Question : Assertion. The radial walls of endodermal cells possess a conspicuous waxy thickening called Casperian strip. Reason. Casparian thickenings block the passage of solute from one side of endodermis to the other via cell wall route.

Question : Assertion : The process of oogenesis must get completed before fertilization Reason : The egg after II Meiosis is ready for fertilization.

Question : Assertion : The primary germ layers are formed during gastrulation. Reason: The body organs are formed from primary germ layers.

Question : Assertion: The portion of the myofibril between two successive Z-lines is considered as the functional unit of contraction called sarcomere. Reason: During contraction, l-bands get reduced whereas A-bands retain the length , thereby causing shortening of the sarcomere.

Question : Assertion : The photosynthetic, floating protists are collectively called phytoplanktons. Reason : The free floating holozoic protozons are collectively termed zooplanktons.

Question : Assertion : The organization of an ecosystem depends on richness of biodiversity. Reason: Biodiversity helps to maintain balance between biotic components.

Question : Assertion : The nest of Dischidia is a modified structure of root . Reason : Nest roots absorb water and food from humusrich soil collected in nest.

Question : Assertion : The lungs are situated in thoracic chamber which is anatomically an air-tighlt chamber. Reason : Such an arrangement is essential to avoid an change in pulmonary volume.

Question : Assertion : The leaves in gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind Reason : In conifers, the needle-like leaves reduce the surface area. Their thick cuticle and sucken stomata also help to reduce water loss.

Question : Assertion. The leaflet of a compound leaf is not a true leaf. Reason. There is no bud in the axil of a leaflet.

Question : Mark the correct answer as Assertion (A): The Kappa in paramecium appears to be a bacterium Reason (R): Kappa particles are not dependent on the chromosomal genes.

Question : Assertion: The joint between the atlas and axis is an example of gliding joint. Reason: Gliding joint allows movement primarily in one plane.

Question : Assertion : The hormone aldosterone increases the reabsorption of Na^(+) by the nephron and the excretion of K^(+). Reason : To maintain the pH of blood and body fluids, the kidneys secrete H^(+) and NH_(4)^(+).

Question : Assertion : In membrane the concentration of Na^(++) and K^(+), and proteins generates action potential. Reason : To maintain the unequal distribution of Na^(+) and K^(+), the neurons use electrical energy.

Question : Assertion. The fruits of groundnuts are not nuts but underground pods. Reason. The pods will not develop until the fertilized ovary is pushed under the soil.

Question : ASSERTION: - Fat is restricted in the diet of a person who has undergone an operation to remove gall bladder.REASONS: - The gall bladder stores lipases which are released in small intestine for digestion.

Question : Assertion: The estrogen level falls after menopause. Reason: The estrogen is synthesised and secreted mainly by uterine lining.

Question : Assertion : The dark reaction in photosynthesis is called because it does not require light energy. Reason: Dark reaction occurs more rapidly in night.

Question : Assertion: Thecompanion cells help in maintaining the pressue gradient in sieve tube Reasons: The companion cells are specialished parenchymatous cells which are closely associated with sieve tube elements

Question : Assertion. The choroid plexuses have little significance as nervous centres. Reason. The choroid plexuses are composed of piamater (connective tissue) lined by the cuboidal epithelium secretory nature.

Question : Assertion: The best quality of pearl is known as lingha pearl and obtained from marine oysters. Reason: Nacre is secreted continuously by the epithelial layer of the mantle and deposited around the foreign particle.

Question : Assertion : The artificial systems gave equal weightage to vegetative and sexual characteristics , this is not acceptable Reason : Vegetative characters are more easily affected by environment.

Question : Assertion: The apical meristem is always protected. Reason: A root cap is present above the meristem in roots.

Question : Assertion : The acid soluble pool represents roughly the cytoplasmic composition. Reason : The macromolecules from cytoplasm and organelles become the acid insoluble fraction.

Question : Assertion :-Testesare locatedin the scrotumoutsidethecoelom, Reason :-A vaginalcoelompartlysurrounds the testisin thescrotum .

Question : Assertion: Tetany is rapid spasm in muscle. Reason: Tetany is usually caused by an increases in the blood calcium level.

Question : Assertion: Terminal oxidation occurs both in aerobic and anaerobic condtions. Reason: Terminal oxidation occurs at terminal step of respiration.