22339 + Interview Questions in Biology in Class 11 Page 253 InterviewSolution

12601.	Question : Read the given statements that refer to different stages of plasmolysis. Select the correct option regarding them. (i) First stage of plasmolysis, when osmotic concentration of cell sap is just equivalent to that of external solution. (ii) Protoplast withdraws itself from corners of hte cell wall (iii) Protoplast gets detached from the cell wall and attains a spherical shape.
Answer» `{:("(I)","(II)","(III)"),({:("Incipient"),("PLASMOLYSIS"):},{:("Limiting"),("Plasmolysis"):},{:("Evident"),("Plasmolysis"):}):}` `{:("(I)","(II)","(III)"),({:("Limiting"),("plasmolysis"):},{:("Incipient"),("plasmolysis"):},{:("plasmolysis"),("Evident"):}):}` `{:("(I)","(II)","(III)"),({:("Limiting"),("plasmolysis"):},{:("Evident"),("Plasmolysis"):},{:("Incipient"),("Plasmolysis"):}):}` `{:("(I)","(II)","(III)"),({:("Evident"),("plasmolysis"):},{:("Incipient"),("Plasmolysis"):},{:("Limiting"),("Plasmolysis"):}):}` Solution : Shrinkage of the protoplast of a cell from its cell wall under the influence of a hypertonic solution is CALLED plasmolysis. Hypertonic solution causes exomosis or wihtdrawal of water from cytoplasm and then the central vacuole of cell. The SIZE of cytoplasm as well as central vacuole and hence protoplast becomes reduced. The pressure on the wall is simultaneously reduced and the elastic wall contracts causing a reduction in cell size .This is first stage of plasmolysis called limiting plasmolysis.At limiting plasmolysis the pressure potential `(Psi_(RHO))` is zero and the osmotic concentration of cell interior is just equivalent to that of EXTERNAL solution (isotonic). The cell is called flaccid. The extra hypertonic external solution continues ot withdraw water from the central vacuole by exosmosis Initially the protoplast withdraws itself from the corners, This stage is known as incipient plasmolysis ,Due to continued exosmosis protoplast shrinks further and wihtdraws from the cell wall except one or a few points. It is known as evident plasmolysis.

Discussion

12602.	Question : Read the given statements that define functions of a particular hormone. (i) Regulatesthe development, maturation and functions of epiddymis, vas deferens, seminal vesicle, prostrate gland, urethra, etc. (ii) Stimulates muscular growth of facial and axillary hair, aggressiveness, low pitch of voice, etc. (iii) Stimulates spermatogenesis. (iv) Act on CNS and sexual behaviour (Libido). (v) Produce anabolic (synthetic) effect on protein and carbohydrate metablosim. (vi) The Leydig,s cells/intestitial cells (present in interbular space). Secrete this hormone under the influence of LH. Which of the following hormones is referred here?
Answer» FSH Progestrone Androgen Melatonin Answer :C

Discussion

12603.	Question : Read the given statements regarding human excretory system and select the correct ones. (i). Presence of glucose in urine is known as uremia. (ii). Distal convoluted tubule (DCT) selectively secretes hydrogen ions, ammonia and potassium ions into the filtrate. (iii). Macule densa is formed by cellular modification in the distal convoluted tubule and the afferent arteriole at their contact location. (iv). Atrial natriuretic factor (ANF) can cause vasoconstriction when blood flow is low to the atria of the heart.
Answer» (i) and (ii) (i) and (iii) (ii) and (iii) (iii) and (IV) Solution :Presence of glucose in the urine is called glycosuria. ANF can cause vasodilation when blood FLOW is high to the atria of the HEART.

Discussion

12604.	Question : Read the given statements and selet the incorrect ones. (i). Sporophyte in mosses is more elaborate than that in liverworts. (ii). Salvinia is homosporous (iii). Life-cycle in all spermatophytes is diplontic. (iv). In cycas, male cones and megasporophylls are borne on the same trees.
Answer» (i) and (ii) (i) and (iii) (ii) and (iv) (iii) and (iv) Solution :Few pteridophytes are heteroporous i.e.,with two types of spores, micropores andmegaspores, e.g., Selaginella salvinia, marsilea PLANTS of cycas are also heterosporous and INVARIABLE dioecis OU,i.e., MALE and female reproductive organs occurs on separate individuals.

Discussion

12605.	Question : Read the given statements and select the incorrect one.
Answer» In Hydra, all neurons are similar and JOIN to form a nerve cell. In earthworms, nervous system CONSISTS of a dorsal nerve CORD, paired ganglia and segmental nerves. Brain is present in insects. Planaria has two nerve cords that join to form rudimentary brain. Solution :In earthworms, nervours system consists of a VENTRAL nerve cord, paired ganglia and segmental nerves.

Discussion

12606.	Question : Read the given statements and select the correct option. Statement 1: Inflammation of a skeletal joint may immobilise the movements of the joint. Statement 2: This may be caused due to uric acid crystals in the joint cavity and ossification of articular cartilage.
Answer» Both statement 1 and 2 correct. Statement 1 is correct but statement 2 is INCORRECT Statement 1 is incorrect but statement 2 is correct Both statements 1 and 2 are incorrect Solution :Excess of uric ACID and its salts (urates) ACCUMULATE in the joint resulting in gouty arthritis. Inflammation of joint MAY immoilise its movements.

Discussion

12607.	Question : Read the given statements and select the correct option Statement-1 : Cut, Cu7 and multiload 375 are the hormone releasing IUDs. Statements-2 : Cu ions released by some IUDs affect the ability of uterine wall to support embryo thus cause contraception
Answer» S-1 is FALSE and S-2 is TRUE Both S-1 and S - 2 are true S-1 is true and S-2 is false Both S-1 and S-2 are false ANSWER :D

Discussion

12608.	Question : Read the given statements and select the correct option. Statement 1 : Articulation between the occipital condyles and the atlas vertebra forms a hinge joint. Statement 2 : It permits the head to move in one plane only, i.e., nodding of head.
Answer» Both STATEMENT 1 and 2 are correct Statement1 is correct but statement 2 is incorrect Statement 1 is incorrect but statement 2 is correct Both STATEMENTS 1 and 2 are incorrect Solution :N//A

Discussion

12609.	Question : Read the given statements and select the correct option. Statement 1: A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin. Statement 2: Myosin and actin together a form a contractile apparatus.
Answer» Both statement 1 and 2 are correct. Statement 1 is correct but statement 2 is incorrect Statement 1 is incorrect but statement 2 is correct. Both statement 1 and 2 are incorrect. SOLUTION :The primary myofilaments CONSIST mainly of MYOSIN protien. In the presence of `CA^(2+)` and enerhy from ATP, actin and myosin interact forming actomyosin which causes contraction of muscles.

Discussion

12610.	Question : Read the given statements and select the correct option. (i)Synaptic cleft of neurons secreates adrenaline. (ii)Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. (iii)Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath. (iv)Spinal and cranial nerves are made of non-myelinated nerve fibres.
Answer» Statements (i) and (ii) are correct but statements (III) and (iv) are incorrect. Statements (i), (ii) and (iii)are correct but statement (iv) is incorrect. Statements (iii) and (iv) are correct but statements (i)and (ii) are incorrect. Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrect. Solution :SYNAPTIC VESICLES of the synaptic knob SECRETE neurotransmitter (e.g. , adrenaline).Spinal nerves and cranial nerves are myelinated nerves.

Discussion

12611.	Question : Read the given statements and select the correct ones. (i)Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body. (ii)Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath. (iii)Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K^+) than to sodium ions (Na^+) (iv)A synapse is formed by the membranes of presynaptic neuron and a post synaptic neuron.
Answer» (i) and (iv) (ii) and (iii) (iii) and (iv) (i) and (iv) Solution :Autonomic neural system controls and coordinates such ORGANS which are under involuntary control and unstriated MUSCLE of the body. Unmyelinated nerve FIBRES have Schwann cells which do not FORM MYELIN sheath.

Discussion

12612.	Question : Read the given statements and select the correct option . (a) All amphibians have two pairs of limbs (b) All amphibians lack tail .
Answer» Both (a) and (B) are FALSE Both (a) and (b) are TRUE Only (a) is true , (b) is false Only (b) is true , (a) is false ANSWER :D

Discussion

12613.	Question : Read the given passage and answer the questions that follows: Rhodinus, a blood-sucking bug, shows five instars before it metamorphoses into an adult. It ahs a very long head with the brain located at tip and an organ called Corpora Cardiaca (C C) behind it. The hormone that ensures the continuum of the juvenile stages is calleda juvenile hormone. Behind the head is a pro - thoracic gland, which gets triggered by the Pro - Thoracico - Tropic Hormone (PTTH) to release ecdysone required for molting into an adult. The following observations were made when the juveniles of this insect were subjected to various conditions : 1. Starved juveniles (any instar) when decapitated rarr remained juveniles and did not molt into adults. 2. Well-fed juveniles (any instar) when decapitated rarr molted into adults. 3. Starved juveniles (any instar) when partially decapitated to remove the brain cells rarr remained juveniles and did not molt into adults. 4. Well - fed juveniles (any instar) when partially deitated to remove the brain cells rarr did not molt into adults. If an unfed, completely decapitated, fth (final) instar juvenile is connected to a well-fed, decapitated fourth instar juvenile by a glass tube so that fluids can be exchanged, what whill be the expected result ?
Answer» Both bugs will continue to remain juveniles. Both bugs will molt into adult forms. The BUG in the FOURTH INSTAR will remain as a juvenile while the ONE in the fifth instar will molt into an adult. The bug in the fourth instar will molt into an adult and the one in the fifth instar will remain as a juvenile. Answer :B

Discussion

12614.	Question : Read the given passage and answer the questions that follows: Rhodinus, a blood-sucking bug, shows five instars before it metamorphoses into an adult. It ahs a very long head with the brain located at tip and an organ called Corpora Cardiaca (C C) behind it. The hormone that ensures the continuum of the juvenile stages is calleda juvenile hormone. Behind the head is a pro - thoracic gland, which gets triggered by the Pro - Thoracico - Tropic Hormone (PTTH) to release ecdysone required for molting into an adult. The following observations were made when the juveniles of this insect were subjected to various conditions : 1. Starved juveniles (any instar) when decapitated rarr remained juveniles and did not molt into adults. 2. Well-fed juveniles (any instar) when decapitated rarr molted into adults. 3. Starved juveniles (any instar) when partially decapitated to remove the brain cells rarr remained juveniles and did not molt into adults. 4. Well - fed juveniles (any instar) when partially deitated to remove the brain cells rarr did not molt into adults. Which of the following conclusions can be drawn from this data ? (i) Ecdysone hormone is produced irrespective of the level of feeding. (ii) C C is thesite of production of juvenile hormone. (iii) PTTH is produced irrespective of the level of feeding. (iv) Increase in juvenile hormone is an important trigger for production of PTTH. (v) Absence of C C alone is a trigger for molting into adult form. (vi) Well-fed larvae in absence of juvenile hotmone can molt into adults.
Answer» (i), (III) (iv) and (v) (II), (iv) and (v) (ii) and (vi) (i) and (iv) Answer :C

Discussion

12615.	Question : Read the given statements and select the correct ones. A membrane which permits the passage of pure solvent molecules to pass through it and not the solute particles is called semi-permeable. A membrane which allows some substances to pass through it more readily than other is known as selectively//differentially permeable. All living biological membranes are perfectly semi-permeable.
Answer» `(a)` and `(ii)` `(ii)` and `(iii)` `(i)` and `(iii)` `(i),(ii)` and `(iii)` Solution :The are certain membranes, which allow pentration of only solvent molecules but not thesolute particles.Such membranes are known as semi-permeable. EXAMPLES of such membranes are cellophane, fish and animal bladders, EGG membrane plasma membane, etc. The biological membranes are not perfectly semi-permeable. They allow to PASS solute molecules only up to a certain EXTENT and are therefore, SELECTIVE in nature. They are known as selectively or differentially permeable memberanes.Al living biological membranes are differentially permemable membranes, which allow some substances to pass through it more readily than others.

Discussion

12616.	Question : Read the given paragraph. In the resting state, the axonal membrane is ___ with more ___ charged ions outside than inside.This unequal distribution of ions is due to (1) the selective permeability of the membrane, which forms an almost impenetrable barrier to _____ and (2) the action of the ____, which pumps _____ Na^(+) out of the neuron for every ____ K^+ brought in. Select the option that correctly fills the blanks in the paragraph.
Answer» `{:((i)" ",(ii)" ",(III)" ",(iv)" ",(V)" ",(vi)),("depolarised","POSITIVELY",NA^+,"sodium-potassium pump","THREE","two"):}` `{:((i)" ",(ii)" ",(iii)" ",(iv)" ",(v)" ",(vi)),("depolarised","negatively",Na^+,"sodium-potassium pump","three","two"):}` `{:((i)" ",(ii)" ",(iii)" ",(iv)" ",(v)" ",(vi)),("polarised","negatively",Na^+,"sodium-potassium pump","three","two"):}` `{:((i)" ",(ii)" ",(iii)" ",(iv)" ",(v)" ",(vi)),("polarised","positively",Na^+,"sodium-potassium pump","three","two"):}` Solution :NA

Discussion

12617.	Question : Read the given paragraph and select the option that correctly fills the blanks in it. Hormones produce their effect on target tissue by binding to specific A called hormone receptors located in the target tissues only water soluble hormones usually need B receptor that generate C messenger for regulating through cell membrane and bind to E receptors, mostly nuclear receptors. The hormone receptor complex enter the nucleus and moslty regulate gene expression or chromosome function by interaction of hormone receptor complex with the genone.
Answer» `{:(A,B,C,D,E),("proteins","membrane-bound","SECOND","lipid","INTRACELLULAR"):}` `{:(A,B,C,D,E),("LIPIDS","membrane-bound","second","water","intracellular"):}` `{:(A,B,C,D,E),("proteins","intracellular","second","lipid","extracellular"):}` `{:(A,B,C,D,E),("proteins","membrane","primary","lipid","intracellular"):}` ANSWER :A

Discussion

12618.	Question :Read the following statements regarding skinA)It is a part of 24 hr/ 7 day body guard system B) It chiefly acts as physical barrier C) It mounts an attack on the germs with lysosomes True among the above
Answer» A & B B & C A & C All Answer :A

Discussion

12619.	Question :Read the following statementsi) Immunological memory is found in higher vertebrates ii) Innate immunity is anamnestic iii) Antibodies which coat the surface of bacteria and make them susceptible to phagocytosis are opsonins iv) Allergic reactions are due to the release of histamine and leukotriens Choose the correct answer
Answer» i, III, IV are TRUE iii, iv are FALSE i, II, iv are true ii, iii, iv are true Answer :A

Discussion

12620.	Question : Read the following statements carefully and select the correct ones. Cardiac fibre are branched with one or more nuclei. (ii) Smooth muscles are unbranched and cylinedrical. (iii) Skeletal muscle can be branched or unbranched. (iv) Smooth muscle are non-striated.
Answer» Only (IV) (II) and (iii) (iii) and (iv) only (iii) Solution :SMOOTH muscles are non-striated, UNBRANCHED and SPINDLE shaped. Skeletal muscles are unbranched. Cardiac muscles FIBRE are uninucleated.

Discussion

12621.	Question : Read-the following statements carefully and givethe answer? A) A leaf is a lateral, generally flattened structureborne on the stem B) The axillary bud later may develop into abranch or flower C) Laeves originate from shoot apical meristem D) Stem perform the functions of storage,support, protection and vegetative reproduction How Many of them are correct
Answer» ONE TWO Three Four Answer :B

Discussion

12622.	Question : Read the following statements and select the correct statements from the given choices . (i) Methanogens are present in the guts of ruminant animals . (ii) Mycoplasma has distinact cell wall (iii) Viroids are infectious naked DNA molecules (iv) Algal component of lichen is phycobiont .
Answer» (II) and (III) (i) and (IV) (i) and (IIII) (ii ) and (iv) ANSWER :(i) and (iv)

Discussion

12623.	Question : Read the following statements and select the correct option Statement-1 : Subcutaneous implantation of synthetic progesterone prevents pregnancy for about 5 years Statements-2 : A tiny amount of progesterone is steadily released from the implants into the blood
Answer» Both S-1 and S-2 are CORRECT and correct EXPLANATION of S-1 Both S-1 is FALSE and S-2 is TRUE S-1 is true and S-2 is false Both S-1 and S-2 are false Answer :A

Discussion

12624.	Question : Read the following statements and select the correct option. Statement 1: Locomotion is the movement of an indvidual from one place to another. Statement 2: All movents are locomotions are but all locomotions are not movements .
Answer» Both STATEMENT 1 and 2 are correct. Statement 1 is correct but statement 2 is incorrect Statement 1 is incorrect but statement 2 is correct. Both statement 1 and 2 are incorrect. Solution :Locomotion is VOLUNTARY movement by an organism from ONE place to another. It is difficult to separate movement from locomotion. The two are LINKED by stating that all locomotion are monements but all miovement are not locomotion.

Discussion

12625.	Question : Read the following statements and select the correct option. Statement (i)Pure water has the highest water potential,i.e. zero. Statement (ii)Process of diffusion does not require any input of energy. Statement (iii)Water moves from the system containing water at higher water potential to the one having lower water potential.
Answer» STATEMENTS `(i)`and `(II)` are correct. Statements`(ii)` and `(III)` are correct. Statements `(i)` and `(iii)` are correct. Statements `(i),(ii)` and `(iii)` are correct. Answer :D

Discussion

12626.	Question : Read the following statements and select the correct option: (a) Pioneer community is the stable and final biotic community of an ecological succession (b)Pioneer community has maximum diversity and niche specialization.
Answer» (B) is CORRECT but (a) is false Both (a) and (b) are TRUE. (a) is correct but (b) is false. Both (a) and (b) are false. Answer :A

Discussion

12627.	Question : Read the following statements and select the correct option: (a) Net primary productivity is less than the gross primary productivity (b) Net primary productivity is equal to the gross primary productivity minus the respiration losses
Answer» Both (a) and (B) are TRUE. (b) is CORRECT but (a) is FALSE. (a) is correct but (b) is false. Both (a) and (b) are false. Answer :A

Discussion

12628.	Question : Read the following statements and select the correct option: (a) Major reservoirs of phosphorus are phosphate rocks and fossil bone deposits laid down in the past geological ages. (b) During weathering of rocks, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants.
Answer» (B) is CORRECT but (a) is FALSE. Both (a) and (b) are true is correct but (b) is false. Both (a) and (b) are false. Answer :B

Discussion

12629.	Question : Read the following statements and select the correct option: (a) Global water cycle does not involve the living organisms. (b) In this cycle, water circulates between hydrosphere and atmosphere.
Answer» Both (a) and (B) are TRUE. (b) is CORRECT but (a) is FALSE. (a) is correct but (b) is false. Both (a) and (b) are false. ANSWER :A

Discussion

12630.	Question : Read the following statements and select the correct option : (a) All vertebrates are chordates (b) All chordates are vertebrates
Answer» (B) is CORRECT but (a) is FALSE (a) is correct but (b) is false both (a) and (b) are TRUE both (a) and (b) are false ANSWER :B

Discussion

12631.	Question : Read the following statements and select the correct option (i) Blood cells secrete fibres of structural proteins called collagen and elastin (ii) Neuroglial cells protect and support the nephrons (iii) Osteocytes are present in spaces called lacunae (iv) Striated muscle fibres are bundled together in a parallel fashion (v) Biceps are involuntary and striated.
Answer» C and D STATEMENTS are wrong A and C statements are wrong B and C statements are wrong A,B ANDE statements are wrong Answer :D

Discussion

12632.	Question : Read the following statements and select the correct option (a) All triploblastic animals are eucoelomates (b) They have a false coelom .
Answer» (B) is CORRECT but (a) is FALSE both (a) and (b) are TRUE (a) is correct but (b) is false both (a) and (b) are false ANSWER :D

Discussion

12633.	Question : Read the following statements and select the correct ones . (i) Circulatory system in arthopods is of closed type . (ii) Parapodia in annelids help in swimming . (iii) Phylum Mollusca is the alrgest animal phylum . (iv) Aschelminthes are dioecious .
Answer» (II) and (IV) (ii) and (III) (i) and (ii) (i) and (iii) ANSWER :A

Discussion

12634.	Question : Readthe followingstatements and select the correct option
Answer» a-4-p, B - 3 Q , C - 2 - s , d - 1-r a-4-q,b-3-p,c-2-s,d-1-r a-4-q,b-2-p,c-3-s,d-1-r a-4-r,b-3-p,c-2-s,d-1-q Answer :B

Discussion

12635.	Question : Read the following statements and select the correct option :
Answer» a-2-p,b-3-s,c-4-q,d-1-r a-1-r,b-3-p,c-4-q,d-2-s a-2-r,b-3-p,c-4-s,d-1-q a-2-s,b-3-p,c-4-q,d-1-r Answer :D

Discussion

12636.	Question : Read the following statements and select the correct ones. (i) A given species may occupy more than one trophic level in the same ecosystem at the same time. (ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem. (iii)Producers constitute the first trophic level of a detritus food chain.
Answer» (i) and (II) (ii) and (III) (i) and (iii) (i) , (ii) and (iii) ANSWER :A

Discussion

12637.	Question : Read the following statements and iind out the incorrect statements. (a) Both a short day plant and a long day plant can hower simultaneously in a given place. (b) Sugar beet, cabbage and carrot are common biennials. (c) Some important food plants, wheat, barley and rye has three kinds of varieties, winter, summer and spring varieties. (d) Vemalisation promotes precocious reproductive development late in the growing season, and enables the plant to have sumcient time to reach matun'ty (e) Many of the extrinsic factors such as temperature and light, control plant growth and development via
Answer» a and b b and c c and b d and c Solution :(a) Both a short day plant and a long day plant can flower simultaneously in a given place. (b) Sugarbeet, cabbage and carrot are common biennials. (c) Some important food plants, wheat, barley and rye has two kinds of varieties: winter and spring varieties. (d) Vernalisation prevents precocious REPRODUCTIVE development late in the growing SEASON, and enables THEPLANT to have sufficient time to reach maturity. (e) Many of the extrinsic FACTORS such as temperature andlight, control plant growth and development via PGR.

Discussion

12638.	Question : Read the following statements and lind out the incorrect statement (a) In plants, growth and differentiation both are open, i.e it can be indeterminate or determinate. (b) The final structure at maturity of a cell or tissue is also determined by the location of the cell within. (c ) Cells positioned away from root apical meristems mature as epidermis, while those pushed to the peripheijy differentiate as root cap cells. (d) Environmental signals such as light, temperature and gravity also effect certain phases or stages of growth.
Answer» b and d c and a a and c c and d Solution :c. Cells POSITIONED away from root apical meristems mature as root cap cells, while those pushed to the periphery differentiate as Intrinsic factors includes both intracellular (genetic) or intercellular factors (chemicals such as plant growth regulators) while the extrinsic factors includes light, TEMPERATURE, WATER, OXYGEN, nutrition, etc

Discussion

12639.	Question : Read the following statements and find out the incorrect statements a. Each actin (thin) filament is made of two ‘6‘ (Globular) actins helically wound to each other. ltbrlt(b). Each ‘6‘ actin is a polymer of monomeric ‘F’ (Filamentous) actins. (c ). Two hlaments of another protein, troponin also run close to the ‘F' actin throughout its length (d). In the resting state a subunit of troponin masks the active binding sites for myosin on the actin filaments. (e). Each meromyosin has two pans, a globular head with a short arm (HMM) and a tail (LMM).
Answer» a, B and C b, c and d c, d and E a. b and e Answer :A

Discussion

12640.	Question : Read the following statements and find out the incorrect statement(s). a. The binding of CO_(2) with haemoglobin is related to the partial pressure of CO_(2). pO_(2) is a major factor which could affect this binding. b. When pCO_(2) is low and pO_(2) is high as in the alveoli, more binding of CO_(2) occurs, whereas when the pCO_(2) is high and pO_(2) is low as in the tissues, dissolution of CO_(2) from carbamino-haemoglobin takes place. c. At the tissue site, where partial pressure of CO_(2) is high due to catabolism, CO_(2) diffuses into blood (RBCs and plasma) and forms HCO_(3)^(-) and 11 . At the alveolar site wher pCO_(2)is low, the reaction proceeds in the opposite direction leading to the formation of CO_(2)" and "H_(2)O . d. Oxygen dissociation curve is highly useful in studying the eifect of factor like pCO_(2),H^(+) concentration, etc., on binding of O_(2) with haemoglobin
Answer» a and b b and c c and d b only Solution :When `pCO_(2)` is high and `pO_(2)` is low as in the alveoli, more binding of `O_(2)` OCCURS, WHEREAS when the `pCO_(2)" is high and "pO_(2)` is low as in the tissues, DISSOCIATION of 02 from oxyhaemoglobin takes place

Discussion

12641.	Question : Read the following statements and find out the incorrect statements.Â A. . During un'ne formation, the tubular cells secrete substances like H+, K+ and H00, into the filtrate. B.As glomerular tiltrate move down in descending limb of HL it gets concentrated and as concentrated filtrate pass upward in ascending limb of hl it gets diluted
Answer» a and bÂ Â b and c c and d a and cÂ Solution :During urine formation, the tubular CELLS secrete SUBSTANCES like `H^(+)`, `K^(+)` and ammonia into the filtrate.Â Conditional reabsorption of `Na^(+)` and water takes PLACE in DCT.

Discussion

12642.	Question : Read the following statements and find out the incorrect statement
Answer» In urochordates, notochord is PRESENT only in larval TAIL. In cephalochordates, notochord is present in head region only and is persistent throughout their life. In VERTEBRATES, notochord is REPLACED by vertebral column in adult. All vertebrates are chordates but all chordates are not vertebrates. Solution :In CEPHALOCHORDATA, notochord is present from head to tail region and is persistent throughout their life.

Discussion

12643.	Question : Read the following statements and find out the incorrect statement.
Answer» Our understanding of the plant kingdom has changed over time. FUNGI, and members of the Monera and Protisa having CELL walls have now been excluded from Plantae. Cyanobacteria that are also referred to as blue GREEN algae are not 'algae' any more Numberical TAXONOMY is based on chromosome NUMBER structure and behaviour Chemotaxonomy that uses the chemical constituents of the plant to resolve confusion, are also used by taxonomists these days. Solution :Cytotaxonomy is based on chromosome number, structure and behaviour.

Discussion

12644.	Question : Read the following statements and choose the correct option. Statement 1 : Atria receive vlood from all parts of the body which subsequently flows to ventricles. statement 2 : Action potentail generated at sino-atrial node passes drom atria to ventricles.
Answer» Action mentioned in statement 1 is dependent on action mentioned in statement 2 Action mentioned in statement 2 is dependent on action mentioned in statement 1 Action mentioned in statement 1 and 2 are independent of each other. Action mentioned in statement 1 and 2 are synchronous. Solution :Blood ENTERS into right and left atria through vena CAVA and pulmonary VEIN . MUSCLES of atrium apread beginning of contraction from SA node to Av node and Parkinje fibers.

Discussion

12645.	Question : Read the following statements and choose the correct option . (a) Urchordates and cephalochordates are called protochordates (b) They are primitive vertebrates .
Answer» Both (a) and (B) are FALSE Both (a) and (b) are TRUE Only (a) is true , (b) is false Only (b) is true , (a ) is false ANSWER :C

Discussion

12646.	Question : Read the following statements (A to E) and select the option with all correctstatements : A. Mosses and Lichens are the first organisms to colonise a bare rock. B. Selaginella is a homosporous pteridophyte. C. Coralloid roots in Cycas have VAM. D. Main plant body in bryophytes is gametophytic, whereas in pteridophytes itis sporophytic. E. In gymnosperms, male and female gametophytes are present within sporangia located on sporophyte.
Answer» B,C and E A,C and D B,C and D A, D and E Answer :D

Discussion

12647.	Question : Read the following statements (A - E) and answer the question which follows them : A) In liverworts, mosses and ferns gametophytes are free-living B) Gymnosperms and some ferns are heterosporous C) Sexual reproduction in Fucus, Volvox and Albugo is oogameous D) The sporophytes in liverworts is more elaborate than that in mosses E) Both, Pinus and Marchentia are dioecious How many of the above statements are correct?
Answer» One Two Three Four Answer :C

Discussion

12648.	Question : Read the following statement and select the correct option : (a) In lancelets notochord extends from head to tail region and is througout their life . (b) In tunicates ,notochord is present only in the larval tail .
Answer» (B) is CORRECT but (a) is FALSE (a) is correct but (b) is false both (a) and (b) are true both (a) and (b) are false Answer :C

Discussion

12649.	Question : Read the followingstatement and select the correct option :
Answer» a-3-p, b-1-r, C-4-Q, d-2-s a-3-p,b-2-r,c-4-q,d-1-s a-3-r , b-1-p, c - 4 - q, d - 2 - s a - 3-p, b - 1 -r, c-4-s, d-2-q Answer :A

Discussion

12650.	Question : Read the following sentences and identify the correctly mathced sentences. In exarch condition, the protoxylem lies oustide of metxylem. II. In endarch condition, the protoxylem lies towards the centre. III. In centrarch condition, metaxylem lies in the middle of the protoxylem. IV. In mesarch condition, protoxylem lies in the middle of the metaxylem.
Answer» i , II ANDIII only ii , iii ANDIV only i , ii andiv only All of these Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : Read the given statements and selet the incorrect ones. (i). Sporophyte in mosses is more elaborate than that in liverworts. (ii). Salvinia is homosporous (iii). Life-cycle in all spermatophytes is diplontic. (iv). In cycas, male cones and megasporophylls are borne on the same trees.

Question : Read the given statements and select the incorrect one.

Question : Read the given statements and select the correct option. Statement 1: Inflammation of a skeletal joint may immobilise the movements of the joint. Statement 2: This may be caused due to uric acid crystals in the joint cavity and ossification of articular cartilage.

Question : Read the given statements and select the correct option Statement-1 : Cut, Cu7 and multiload 375 are the hormone releasing IUDs. Statements-2 : Cu ions released by some IUDs affect the ability of uterine wall to support embryo thus cause contraception

Question : Read the given statements and select the correct option. Statement 1 : Articulation between the occipital condyles and the atlas vertebra forms a hinge joint. Statement 2 : It permits the head to move in one plane only, i.e., nodding of head.

Question : Read the given statements and select the correct option. Statement 1: A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin. Statement 2: Myosin and actin together a form a contractile apparatus.

Question : Read the given statements and select the correct option . (a) All amphibians have two pairs of limbs (b) All amphibians lack tail .

Question :Read the following statements regarding skinA)It is a part of 24 hr/ 7 day body guard system B) It chiefly acts as physical barrier C) It mounts an attack on the germs with lysosomes True among the above

Question : Read the following statements carefully and select the correct ones. Cardiac fibre are branched with one or more nuclei. (ii) Smooth muscles are unbranched and cylinedrical. (iii) Skeletal muscle can be branched or unbranched. (iv) Smooth muscle are non-striated.

Question : Read the following statements and select the correct statements from the given choices . (i) Methanogens are present in the guts of ruminant animals . (ii) Mycoplasma has distinact cell wall (iii) Viroids are infectious naked DNA molecules (iv) Algal component of lichen is phycobiont .

Question : Read the following statements and select the correct option Statement-1 : Subcutaneous implantation of synthetic progesterone prevents pregnancy for about 5 years Statements-2 : A tiny amount of progesterone is steadily released from the implants into the blood

Question : Read the following statements and select the correct option. Statement 1: Locomotion is the movement of an indvidual from one place to another. Statement 2: All movents are locomotions are but all locomotions are not movements .

Question : Read the following statements and select the correct option: (a) Pioneer community is the stable and final biotic community of an ecological succession (b)Pioneer community has maximum diversity and niche specialization.

Question : Read the following statements and select the correct option: (a) Net primary productivity is less than the gross primary productivity (b) Net primary productivity is equal to the gross primary productivity minus the respiration losses

Question : Read the following statements and select the correct option: (a) Global water cycle does not involve the living organisms. (b) In this cycle, water circulates between hydrosphere and atmosphere.

Question : Read the following statements and select the correct option : (a) All vertebrates are chordates (b) All chordates are vertebrates

Question : Read the following statements and select the correct option (a) All triploblastic animals are eucoelomates (b) They have a false coelom .

Question : Read the following statements and select the correct ones . (i) Circulatory system in arthopods is of closed type . (ii) Parapodia in annelids help in swimming . (iii) Phylum Mollusca is the alrgest animal phylum . (iv) Aschelminthes are dioecious .

Question : Readthe followingstatements and select the correct option

Question : Read the following statements and select the correct option :

Question : Read the following statements and find out the incorrect statement

Question : Read the following statements and find out the incorrect statement.

Question : Read the following statements and choose the correct option. Statement 1 : Atria receive vlood from all parts of the body which subsequently flows to ventricles. statement 2 : Action potentail generated at sino-atrial node passes drom atria to ventricles.

Question : Read the following statements and choose the correct option . (a) Urchordates and cephalochordates are called protochordates (b) They are primitive vertebrates .

Question : Read the following statement and select the correct option : (a) In lancelets notochord extends from head to tail region and is througout their life . (b) In tunicates ,notochord is present only in the larval tail .

Question : Read the followingstatement and select the correct option :