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17001.

Question : Given beloware the features of regions of the root

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SOLUTION :
Discussion
17002.

Question : Given below are the food products obtained by microbialaction Name the respective organism responsible for their production (a) Swiss Cheese (b) Bread dough

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SOLUTION :(a) SWISS Cheese - Propionibacterium shermanii,
(b) Bread dough - Saccharomyces CEREVISIAE
Discussion
17003.

Question : Given below are the extra embryonic membranes of which identify the outermost membrane.

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a) AMNION
B) Chorion
c) YOLK sac
d) ALLANTOIS

Solution :Chorion
Discussion
17004.

Question : Given below are the events that are observedin an artificial hybridization programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme. (a) Re-bagging (b) Selection of parents (c ) Bagging (d) Dusting the pollen on stigma (e ) Emasculation (f ) Collection of pollen from male parent

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Solution :The correct order arrangement for artifical HYBRIDISATION is given below: (a) Selection of PARENTS (b) Emasculation (The process of removing anther from flower and before it bursts). (c ) Bagging (Emasculed FLOWERS have to be covered with a bag made up of butter PAPER) (d) To collect pollen grain from MALE flower. (e ) Pollen grain is dusted on stigma (f ) Doing bagging again if there are unisexual flowers in female plant, then there is no need to do emasculation.
Discussion
17005.

Question : Given below are the examples of symbiotic association in which one partner was mentioned . Write the mane of the mutual co-partner. (a) Azolla fern +…………. . (b) Root nodules of legume plants +………… .(c) Phycomycetous fungi +………….. .

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ANSWER :(a) ANABAENA AZOLLA (BLUE green alga) (b) Rhizobium (C) Angiosprm roots.
Discussion
17006.

Question : Given below are the different steps in recombinant DNA technology. Arrange them according to the sequence of occurrence .a. Transferring the recombinant DNAinto the hostb. Extractionof the productc. Fragmentation of DNA by restriction endonucleasesd. Ligation of DNA fragment into a vectore. Isolation of DNAf. Culturing the host cells in a medium at large scale .g. Isolation of a desired DNA fragment .

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SOLUTION :a. Isolation of DNA
b. Fragmentation of DNA by restriction endonucleases
c. Isolation of a desired DNA FRAGMENT.
d. Ligation of DNA fragment into a vector
e. Transferring the recombinant DNA into the host .
f. Culturing the host cells in a MEDIUM at large scale .
g. EXTRACTION of the PRODUCT .
Discussion
17007.

Question : Given below are the events in human reproduction. Write them incorrect sequential order. Insemination, gametogenesis, fertilisation, parturition, gestation, implantation

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Solution :Transport of sperms in female reproductive TRACT, gametogenesis, FERTILIZATION, parturition, embryonic development, IMPLANTATION.
The reproductive processes in human includes :
(1) Gametogenesis `rarr` gametes (formation of reproductive cells. Sperms in male and ovum in FEMALES).
(2) Insemination `rarr` Transport of sperms in female reproductive tract
(3) Fertilizations `rarr` Fusion of male and female reproduction.
(4) Implantation `rarr` Formation of blastocyst, development and implantation in the wall of uterus.
(5) Gestation `rarr` Embryonic development in female body.
(6) Delivery (parturition) `rarr` BIRTH of a child.
Discussion
17008.

Question : Given below are the components related to simplified model of mineral cycling in terrestrial ecosystem . Construct a flow chart . [Hint : weathering of rock ]

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SOLUTION :
Discussion
17009.

Question : Given below are the components related to simplified model of mineral cycle in a terrestrial ecosystem. Construct a flow chart.

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SOLUTION :
Discussion
17010.

Question : Given below are the basic steps in IVF treatment cycle. Select the proper sequence. (i) Ovarian stimulation (ii)Egg retrieval. (iii) fertilization (iv) Embryo culture (v) Embryo transfer

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(a) `(ii ) to(IV )to (v)to(i)to (III)`
(B) `(i) to(iii )to (ii)to(v)to (iv)`
(c) `(i ) to(ii )to (iii)to(iv)to (v)`
(d) `(ii ) to(i)to (iii)to(v)to (iv)`

Solution :`(i ) to(ii )to (iii)to(iv)to (v)`
Discussion
17011.

Question : Given below are the components related to simplified model of mineral cycling in a terrestrial ecosystem . Construct a flow chart. ( Hint : Weathering of rock)

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SOLUTION :PRODUCERS `rarr` CONSUMERS `rarr` DETRITUS `rarr` soil solution `rarr` Minerals in rock
Discussion
17012.

Question : Given below are some organisms. I. Fowl II. Humans III. Grasshopper Following alphabets related to the above animals. Male homogametic-A Female heterogametic-B Male heterogametic -C Female homogametic -D Which of the following option correctly describes the above animals in terms of sex determination?

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`{:(I""II""III),(A,B""C,D""C,D):}`
`{:(I""II""III),(C,D""A,B""C,D):}`
`{:(I""II""III),(A,D""C,D""A,D):}`
`{:(I""II""III),(B,C""C,D""A,B):}`

ANSWER :A
Discussion
17013.

Question : Given below are some of the features observed in the ship of the desert-camel to conserve water. Which of these is incorrect ?

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Extra LONG loops of Henle
Concentrated URINE
Nitrogenous waste as URIC ACID
Utilzation of metabolic water

Answer :C
Discussion
17014.

Question : Given below are some humen organs, Identify one primary and one secondary lymphoid organs :

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Solution :The primary LYMPHOID ORGANS is thymus.
TONSILS are SECONDARY lymphoid organs.
Discussion
17015.

Question : Givenbeloware someof the commonexamplesof spciesinteractionCatagorisethemintopredationcommensalismmutualismparasitismor competition. a. Egretforagingcloseto grazingcattle B.Figflowerspolinated by wasp c. Cuckoo layingegg in crow'snest d. Phytophagousinsects feedingon a plant. e Clownfisheslivingamong seaanemone. f. Abingdon tortoise in Galapagosislandsbecameextinctwithima decadeaftergoatswere intorducedon the island.

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SOLUTION :a, E- Commensalsim
b- Mutualism
C- PARASITISM
d- Predation
F- competition
Discussion
17016.

Question : Give below are some human organs . Identifyone primary and one secondary lymphoid organ . Explain its role . Liver , thymus, stomach , thyroid , tonsils .

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Solution :Primary LYMPHOID organ-THYMUS
SECONDARY lymphoid organ-TONSILS
Immunocompetency of T cells is achieved in Thymus Whereas tonsils help to fight VIRAL and bacterial infections.
Discussion
17017.

Question : Given below are some factors which may affect the oxyhaemoglobin dissociation curve.Carbon monxide, Foetal haemoglobin, Oxygen,water , Myoglobin, Temperature. Choose the correct options

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OXYGE, water and TEMPERATURE
OXYGEN, CARBON monoxide and myoglobin
Temperation , foctal HEAMOGLOBIN and myoglobin

Answer :D
Discussion
17018.

Question : Given below are some events of eukaryotic replication. Name the enzymes involved in the process. (a) Unwinding of DNA(b) Joining of Okazaki fragments (c ) Addition of nucleotides to new strand(d) Correcting the rapair

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Solution :a) HELICASE
B) DNA ligase
C) DNA polymerase
d) Nuclease
Discussion
17019.

Question : Given below are some differences between primary air pollutants and secondary air pollutants. Which one of the following is an incorrect difference ?

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`{:(" Primary AIR pollutants", "Secondary sir pollutants"), ("These PERSIST in the form in which they are added to the environment.", "These are formed by INTERACTION among the primary pollutants."):}`
`{:(" Primary air pollutants", "Secondary sir pollutants"), ("These are more toxic than the secondary pollutants.", "These are LESS toxic than the primary pollutants"):}`
`{:(" Primary air pollutants", "Secondary sir pollutants"), ("Examples include DDT,"CO_(2) , "Examples include Ozone, PAN"):}`
NONE of these

Solution :Secondary air pollutants are more toxic than primary air pollutants.
Discussion
17020.

Question : Given below are pairs of disease and causative organisms. Which one out of these is not a matching pair and why? Filariasis : Wuchereria Ringworm : Ascaris AIDS : Human Immuno Virus Malaria : Plasmodium

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Solution :AIDS - HUMAN IMMUNO Virus. Because all the others are vector borne diseases and AIDS is SPREAD through a virus.
Discussion
17021.

Question : Given below are four statements (i-iv) regarding human blood circulatory system i) Arteries are thick-walled and have narrow lumen as compared to veins ii) Angina is acute chest pain when the blood circulation to the brain is reduced iii)Persons with blood group AB can donate blood to any person with any blood group under ABO system iv)Calcium ions play a very important role in blood clotting

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(i) and (IV)
(i) and (II)
(ii) and (III)
(iii) and (iv)

ANSWER :A
Discussion
17022.

Question : Given below are three statements (I -IV) regarding the human blood circulatory system . (I) In the treatment of angina pectoris nitrous oxide and nitro glycerin are used. (II) veins have thinner walls and broader lumen than arteries . (III) Artificial pacemakers are used in arrhythmia. How many of the above are correct statements ?

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I only
I , II and III
III only
I and II

Answer :B
Discussion
17023.

Question : Given below are four statements i-iv regarding geological time scale. Read them carefully. (i) Paleozoic era is the era of ancient life. (ii) Ordovician period is the age of vertebraes. (iii) Carboniferousperiod is the age of reptiles (iv) Proterozoic era is the era of early life Which of the above two statements are incorrect ?

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I and IV
ii and iii
ii and iv
i and iii

Solution :Ordovician period existed about 500 million years ago and is the age of INVERTEBRATES. Carboniferous period that existed 350 million years ago is the age of AMPHIBIANS.
Discussion
17024.

Question : Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements. (A)Wings of butterfly and bird look alike and are the results of (i), evolution. (B) Miller showed that CH_(4), H_(2), NH_(3), and (1) when exposed to electric discharge in a flask resulted in formation of (ii) (C) Veriform appendix is a (i) organ and an (ii) evidence of evolution. (D) According to Darwin evolution took place due to (i) and (ii) of the fittest.

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(A)-(i) convergent, (D)-(i) small variations, (II) survival
(A)-(i) covergent, (B)-(i) oxygen, (ii) nucleosides
(B)-(i) water vapour, (ii) amino acids, (C)-(i) homologous, (ii) anatomical
(C)-(i) VESTIGIAL, (ii) anatomical , (D)-(i) MUTATIONS, (ii) multiplication.

Answer :A
Discussion
17025.

Question : Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements. (A) Wings of butterfly and birds look alike and are the results of i evolution. (B) Miller showed that CH_(4), H_(2),NH_(3) and i when exposed to electric discharge in a flask resulted in formation of ii (C) Vermiform appendix is a i organ and an ii evidence of evolution. (D) According to Darwin, evolution took place due to i and ii or the fittest.

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i convergent: i SMALL variation, ii SURVIVAL
i covergent, i oxygen, ii NUCLEOSIDES
i water vapour, ii amino acids: i homologous, ii anatomical
i vestigial, ii anatomical: i MUTATIONS, ii multiplication.

Solution :N//A
Discussion
17026.

Question : given below are four methods (a-d) and their modes of action (i-iv) in achieving contraception. select their correct matching from the four options that follow Method(a. the pill, b. condom, c.Vasectomy, d.Copper-T), Mode of Action(i. prevents sperms reaching cervix, ii. prevents implantation, iii. prevents ovulation, iv.Semen contains no sperm)

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a-iii, b-iv, C-i, d-ii
a-ii, b-iii, c-i, d-iv
a-iii, b-i, c-iv, d-ii
a-iv, b-i, c-ii, d-iii

ANSWER :C
Discussion
17027.

Question : Given below are four statements (A-D) , each with one blank. Select the option which correctly fills up the blank in any of the two statements. i. Materials to be packaged in the form of vesicles from the ER fuse with the ……face of the Golgi apparatus. ii. Majority of the chloroplasts of the green plants are found in the ..........cells of leaves. iii. The nucleolus is a site for active ...........synthesis . iv. During zygotene, chromosomes start pairing together and this process of association is called ............ .

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i. Trans , ii. Mesophyll
i. Mesophyll, ii. RIBOSOMAL protein
iii. Transfer RNA, IV. CHIASMATA
iv . Synapsis , i. CIS

Answer :D
Discussion
17028.

Question : Given below are few types of plants. Mention their habitats. (a) Halophytes (b) Chasmophytes (c) Cryophytes (d) Psammophytes.

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SOLUTION :(a)Halophytes: Plants LIVING in SALINE soils.
(b) Chasmophytes: Plants living in rocky CREVICES.
( c ) CRYOPHYTES: Plants living in ice surface.
(d) Psammophytes: Plants living in sandy soils.
Discussion
17029.

Question : Given below are different steps of transformation in a bacterial cell. Arrange them in correct sequence. (i) Heat shock (at 42°C) (ii) Treatment of bacterial cell with divalent cations at 4°C (iii) Bacterial cells are incubated with recombinant DNA on ice (iv) Recombinant/Transformed bacteria are plated and kept at 37°C

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(i), (II), (III), (IV)
(ii), (i), (iii), (iv)
(ii), (iv), (i), (iii)
(iv), (ii), (iii), (i)

ANSWER :B
Discussion
17030.

Question : Given below are asserton and reason, Point out if both are true with reason being correct explanation (A). Both correct but reason not correct explanation (B) assertion true but reason wrong (C ), and both wrong (D) Assertion. Hearing aids help the hearing imparied to hear. Reason. They make sound travel through skull bones.

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A
B
C
D

Answer :C
Discussion
17031.

Question : Given below are certain features of mouse. Read them and select why mouse is the most preferred animal for studies on gene transfer (i) Short oestrous cycle and gestation period (ii) Relatively short generation time (iii) Covenient in vitro fertilisation (iv) Production of several offspring per pregnancy

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(i) and (II) only
(i) only
(i),(ii) and (IV) only
(i),(ii),(III) and (iv)

ANSWER :D
Discussion
17032.

Question :Given below are assertions and reasons point out if both are true with reaseon being correct explanation (A ),both are true but reson is explanation (B ) assertion is true but reason is worng (C ) and bothare worng (D) Assertion.Duodenum isthe main organ of small intestine along ileum is Reason. In duodeum,digestion and absorption mainly occur

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A
B
C
D

Answer :D
Discussion
17033.

Question : Given below are assertionand reson. Point out if both are true with reason being . Point explanation (A). Both true but reason not correct explanation (B), assertion true but reason wronhg ©, both wrong (D), Assertion. Amphibians have evolved from fishes. Reason . take the example of fossil Archaeopteryx.

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ANSWER :C
Discussion
17034.

Question : Given below are assertion and reason. Point out if both are ture and reason is correct explanantion (A), both true but reason is not correct explanation (B), assertion true but reason is wrong (C ), both are wrong (D). Assertion. Among primates Chimpanzee is closest relative to the present day humans. Reason : The banding pattern of autosomes 3 and 6 of humans and Chimpanzee is remarkably similar.

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(A)
(B)
(C )
(D)

Solution :Cenozoic/Caenozoic. Geolocial era that began 65 million YEARS ago. Marked by emergenceof HIMALAYAS and ALPS, and spred of mammals.
Discussion
17035.

Question : Given below are assertion and reason. Point out if both are true with reason is not true explanation (A) both true but reason is not true explanation (B), assertion true but reason is wrong (C ), both are wrong, (D). Assertion: Comparative biochemistry provides a strong evidence in favour of common ancestry of living beings. Reason: Genetic code is universal.

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SOLUTION :N//A
Discussion
17036.

Question : Given below are assertion and reason. Point out if both are true with reason being correct explanation (A), both are true but reason is not correct explanation (B), assertion is true but reason is wrong (C) and both are wrong (D) Assertion. Glycerides are important nutrients for the body. Reason. Glycerides are hydrolysed into fatty acids and glycerol which are absorbed in intestine to form chylomicrons

Answer»

A
B
C
D

Answer :C
Discussion
17037.

Question : Given below are assertion and reason. Point out if both are true with reason being correct explanation (A). Both correct but reason not correct explanation (B), assertion correct but reason wrong (C ), both are wrong (D). Asserion, Owls move freely during night. Reason. They have large number of rods on their retina.

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A
B
C
D

Answer :A
Discussion
17038.

Question : Given below are assertion and reason. Poin t out if both are true and the reason is correct explanation (A), both are true but reason is not correct explanation (B), assertion is ture but reason is wrong © and both are wrong divides without increase in size.Reason. Zona pellucida remains till cleavage is finished

Answer»

A
B
C
D

Answer :B
Discussion
17039.

Question : Given below are assertion and reason. Assertion. In fungi, sexual apparatus decreases in complexity from lower to higher forms. Reason. In algae, sexual apparatus increases in complexity from simple to higher forms.

Answer»

Point out if both are true with TEASON being correct explanation
both true but REASON is nut correct explanation
assertion true but reason is WRONG
both are wrong

ANSWER :B
Discussion
17040.

Question : Given below are a few statements related to external fertilization. Choose the correct statements.(i) The male and female gametes are formed and released simultaneously.(ii) Only a few gametes are released into the medium.(iii) Water is the medium in a majority of organisms exhibiting external fertilization.(iv) Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism.(A) iii and iv(B) i and iii(C) ii and iv(D) i and iv

Answer»

iii and IV
i and iii
ii and iv
i and iv

Solution :In most aquatic organisms, such as a majority of algae and fishes as well as amphibians, synbgamy occurs in the external medium (water), i.e., outside the body of the organism. This type of gametic FUSION is called external fertilisation. Organisms exhibiting external fertilisation show great sunchrony between the sexes and release a number of gametes into the surrounding medium (water) in ORDER to enhance the CHANCES of syngamy. This happens in the bony fishes and frogs where a large number of offspring are produced. A major disadvantage is that the offspring are extermely vulnerable to predators THREATENING their survival up to adulthood.
Discussion
17041.

Question : Given below are a few statements regarding somatic hybridization. Choose the correct statements. (i) Protoplasts of different cells of the same plant are fused. (ii) Protoplasts from cells of different species can be fused. (iii) Treatment of cells with cellulase and pectinase is mandatory. (iv) The hybrid protoplast contains characters of only one parental protoplast,

Answer»

(i) and (III)
(i) and (ii)
(i) and (iv)
(ii) and (iv)

Solution :Isolated protoplast (surrounded by plasma membranes) from two different varieties can be fused to get hybrid protoplasts which grow to form new PLANT. The ENZYME required to obtain wall FREE or naked protoplasts are cellulase, hemiceilulase and pectinase, which dissolves cell wall. Somatic cell hybrid (protoplast hybrid) are produced with the help of polyethylene GLYCOL (PEG) and sodium nitrate which promote fusion. In protoplast fusion, chemofusion and electrofusion are employed.
Discussion
17042.

Question : Given below are a few statements regarding somatic hybridization. Choose the correct statements. (i) Protoplasts of different cells of the same plant are fused.(ii) Protoplasts from cells of different species can be fused. (iii) Treatment of cells with cellulase and pectinase is mandatory. (iv) The hybrid protoplast contains characters of only one parental protoplast.

Answer»

(II) and (III)
(i) and (ii)
(iii) and (ii)
(ii) and (iii)

SOLUTION :(ii) and (iii)
Discussion
17043.

Question : Given an example of missing link

Answer»


ANSWER :ARCHAEOPTERYX
Discussion
17044.

Question : Given are names of some transgenic animals. Identify the name of transgenic sheep

Answer»

Rosie
Dogie
TRACY
ANDI

Solution :In 1990, Tracy, the TRANSGENIC EWE was born in Scotland.
Discussion
17045.

Question : (a) Define the following terms with an example (i) Hologamy (ii) Isogamy (ii) Anisogamy (iv) Merogamy (v) Paedogamy

Answer»

Solution :(a) Hologamy: In Hologamy, the adult INDIVIDUALS do not produce gametes, but they themselves act as gametes and fuse to form NEW individuals. E.g.: Trichonympha
(b) Isogamy : Fusion of MORPHOLOGICALLY & physiologically similar gametes. E.g.: Monocystis
(c) Anisogamy : Fusion of morphologically & physiologically DISSIMILAR gametes. E.g.: Vertebrates
(d) Merogamy : Fusion of small sized morphologically different gametes (merogametes)
(e) Paedogamy : Fusion of young individuals produced immediately after the mitotic DIVISION of adult parent cell.
Discussion
17046.

Question : Given an accountof structureand functions of hindbrain.

Answer»

Solution :1. STRUCTURE of hindbrain :
(1) Hind brainincludescerebellum pons Varolii and medullaoblongata.
(2) CEREBELLUM is 11% of the total brainand is the second largestpart of thebrain.
(3) It has THREE lobes, medianvermis and lateraltwo cerebellarhemispheres.it hasoutergreyand innerwhitematter.
(4)Cerebellar cortexshows sulciand gyri. Theinnerwhite matter ofcerebellarmedullas showsarborviataeor branchingtree-likeprocesses.
(5) Ponsis the part that connectsthe two cerebellarhemi-spheres.It has outer whiteand innergrey matter. Pons is made up of nerve fibreswhich form bridgesbetweencerebrumand medulla oblongata.
(6) Medullaoblongatais thelastpart of the hind brainwhichcontinues furtheras a spinalcord. It has outerwhite andinner greymatter.
(7) Internally it has posterior choroidplexus.
(8) Eight PAIRSOF cranialnervesarisefrom medulla oblongata.
2. Functions of hind brain.
(1) Cerebellum :
(1) Cerebellum is a primarycentre for the control of equilibrium,posture , balancing and orientation.
(2) Neuromuscular activities are regulatedby the cerebellum.
(3)Coordinationof walking, running , speaking , etc.is under thecontrolof hindbrain.
(2) Pons :
(1) Activities of the two cerebellarhemispheres are coorinated by pons.
(2) Nervefibrescross over in this area andthus the right side of the brain controlsthe leftpart of the bodyand viceversa.
(3) Pons controlsthe consciousness of the brain.
(4) Breathingcentre islocatedin pons along withmedulla.
(3) Medulla oblongata :
(1) Medullaoblongatacontrolsall theinvoluntary activities such as heartbeats,respiration, vasomotoractivities
(2) Peristalsisand reflexactionssuch ascoughing. sneezing, swallowing, etc.are alsounder thecontrolof medullaoblongata.
(3) Medullaoblongatais essentialfor all the virtal functions of the body.
Discussion
17047.

Question : Given above is the bar diagram showing age structure of three different populations. Observe the diagram carefully and answer the following questions.Select the stable population.

Answer»

SOLUTION :B. STABLE POPULATION
Discussion
17048.

Question : Given above is the bar diagrams showing age structure of three different populations. Select stable population. (B) Compare the nature of population growth in A,B, C.

Answer»

SOLUTION :(A) B
(B)
Discussion
17049.

Question : Given a schematic labelled diagram to represent oogenesis (without descriptions).

Answer»

SOLUTION :
Discussion
17050.

Question : Define carbon cycle.

Answer»

SOLUTION :
Discussion