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9351.

Question : Recombination

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Solution :(1)Recombination is the phenimenon that is seen during sexual reproduction.(2)The closely linked genes on the same chromosomes do not SEPARATE but tightly linked to each other and hence they do not separate during meitotic crossing over.(3)Such genes are said to show low recobination.THe other types of genes which are not closely linked to each other may easily separate at the time of corossing over and hence are said to show high recobination.(4)These opinions were given morgen when he performed STUDIES of dihybrid cross on drosophila.(5)He CROSSED yellow bodied white eyed female to brown bodied red eyed males.He observed that these two genes do not separate independently and do not yield 9:3:3:1 ratio as EXPLAINED by mendel.(6)The genes for white eye and yellow body are tightly linked with each other and thus show only 1.3% recombination.Whereas white eyes and miniature wings show 37.2% recombination.
9352.

Question : Recombination describes

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GENERATION of PARENTAL gene COMBINATIONS
Generation of non-parental gene combinations
Generation of both parental and non-parental gene combinations
None of the above

Answer :B
9353.

Question : Recombinant Factor VIII is produced in the ____________ cells of the Chinese Hamster .

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LIVER CELLS
BLOOD cells
OVARIAN cells
BRAIN cells

Solution :ovarian cells
9354.

Question : Recombinant DNA bearing ampicillin resistance gene is passed in E.coli. The latter are spread on agar plates contraining ampicillin. Then

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Both transformed and untransformed cells die
both transformed and untransformed cells grow
Transformed recipient cells grow and untrasformaed cells die
Transformed recipient cell die and untransformed cells grow

Solution :Recombinant DNA bearing AMPICILLIN resistance gene is PASSED in E.coli. The latter are spread on AGAR plantes CONTAINING ampicillin. Then transformed recipient cells grow and untransformed cells die
9355.

Question : Recombinant DNA technology is related with:

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STANLEY COHEN and Herberf Boyer
Bateson and Punnet
Huxley and Harvey
Schleiden and Schwann

Answer :A
9356.

Question : Recombinant DNA directly injected into the nucleus of the animal cell.a) Microinjectionb) Gene gunc) Using disarmed pathogend) Using plasmid vector

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MICROINJECTION
GEN gun
Using DISARMED pathogen
Using PLASMID vector

Answer :A
9357.

Question : Recombinant DNA technology can be accomplished only if we have the following key tools i.e., Restriction enzymes, polymerase enzyme. Ligase and vecors. State the functions of (a) Ligase (b) Restriction enzymes.

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Solution :(a) Ligases: It is anenzyme USED to join the DNA FRAGMENTS. It is a moleular suture or molecular glue or joiningenzyme which is commonly used in rDNA technology
(b) RESTRICTION enzyme: Enzymes which cut DNA at specific SITES into fragmentscontaining identifiable genes/It is KNOWN as biological scissors/molecular scissors.
9358.

Question : Recombiant DNA or rDNA technology was discovered by

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Khorana
Bateson and DE Vries
Sutton and Avery
Watson

Answer :B
9359.

Question : Recognize the figure and find out the CORRECT labeling

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a - LINEAR CURVE in geometric growth , B - sigmoid or S - curve in arithmetic growth
a - linear curve in arithmetic growth ,b - sigmoid or S - curve in geometric growth
a - sigmoid or S - curve in geometric growth , b - linear curve in arithmetic growth
a - sigmoid or S - curve in arithmetic growth , b - linear curve in geometric growth

ANSWER :B
9360.

Question :Recognition sequence in EcoRI is :

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GAATTC
GGCC
AAGCTT
CTGCAG

Answer :A
9361.

Question : Write a note on recognition sequences or restriction sites.

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Solution :(1)Restriction endonucleases cut the DNA fragment at specific site.The site at which there is a cut is called recognition site or restriction site.(2)Restriction endonucleases have the ability to recognize DNA with specific 4 to 8 base pair sequences.RENs CLEAVE these sequences.(3)Every restriction site is identified by a specific restriction endonuclease.(4)At the restriction site both the DNA strands are cut at the same time at these specific p[oints.(5)Most of the restriction stes have palindromic DNA and hence called palindromes.
9362.

Question : Recognise the figure and find out thecorrect mathching

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b-light CHAIN c-heay chain ,d-N TERMINAL e-C terminal , a-antigen binding SITE
b-light chain c-HEAVY chain e-N terminal d-C terminal , a-antigen binding site
c-liht chain b-heavy chain d-N terminal e-C terminal ,a-antigen binding site
c- lightchain ,b- heavy chain ,a-N temimal d-C terminal ,e-antigen binding site

Solution :
9363.

Question : Recognise the figure and find out thecorrectmatching

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a' PRODUCES depressant while 'B' influences cardiovascular SYSTEM
Receptorsof 'a'are present in CNSand GIT while for 'b' are present principally in brain
a' producessmackwhile 'b' produces charas
All of theabove

Solution :
9364.

Question : Recognise the figure and find out the correct matching.

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a - ARCHAEOPTERYX, B - Tyrannosaurs, C - Stegosaurs, d - Pteranodon
d - Archaeopteryx, c - Tyrannosaurs, a - Stegosaurs, b - Pteranodon
c - Archaeopteryx, d - Tyrannosaurs, c - Stegosaurs, a - Pteranodon
b - Archaeopteryx, d - Tyrannosaurs, a - Stegosaurs, c - Pteranodon

Solution :
9365.

Question : Recognise the figure and find out the correct matching

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a-gametocytes,B- SPOROZOITES, C—asexually, b-sexually
d-gametocytes, a-sporozoites, b-asexually, c- sexually
a-gametocytes, d-sporozoites, b-asexually, c- sexually
d-gametocytes, b-sporozoites, a-asexually, c- sexually

Answer :D
9366.

Question : Recognise the figure and find out the correct matching

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ANSWER :D
9367.

Question : Recognise the figure and findout the correct matching .

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a-gemethocytes d-sporozoites , C- ASEXUALLY ,b-sexually
d-gametocytes, d-sporozoites ,b-asexually , c-sexually
a-gametocytes ,d-sporozoites ,b-asexually ,c-sexually
d-gemetocytes ,a-sporozoites, b-asexually , c-asexually

Solution :
9368.

Question : Recognise the figure and find out the CORRECT matching :

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a-Haplontic LIFE CYCLE , b-diplontic life cycle , C-haplodiplontic life cycle
a-Haplodiplontic life cycle , b-diplontic life cycle , c-haplontic life cycle
a - Diplontic life cycle , b - haplodiplontic life cycle, c- haplontic life cycle
a - Haplontic life cycle , b - haplodiplontic life cycle , c - diplontic life cycle

Answer :C
9369.

Question : Recognise the figure and find out the correct match.

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a-Antheridial BRANCH, b-ARCHEGONIAL branch, C-SPHAGNUM gametophyte.
a-Antheridial branch, b-Archegonial branch, c-Sphagnum sporophyte
a-Archegonial branch, b-Antheridial branch, c-Sphagnum sporophyte
a - Archegonial branch , b-Antheridial branch, c - Sphagnum gametophyte

Answer :A
9370.

Question : Recessive mutations are expressed normally in

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HOMOZYGOUS condition
HETEROZYGOUS condition
has to EXPRESS ALWAYS SINCE it is a mutation
neither in homozygous nor in a heterozygous condition

Answer :A
9371.

Question : Reciprocal cross is

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INTRASPECIFIC hybridization
Back cross
Pollen grains from one variety deposited on the STIGMA of the constrating variety andvice versa, in hybridization EXPERIMENTS
TEST cross

Answer :C
9372.

Question : Recessive trait is seen due to............

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ANSWER :NON FUNCTIONAL ENZYME or no enzyme
9373.

Question : Recipient of Nobel prize for DNA double helical :

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WATSON and crick
Khorana and nirenberg
Kornberg and Ochoa
Beadle and tatum

Answer :A
9374.

Question : Recessive epistasis is defined as:

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a situation in whicha gene PAIR in HOMOZYGOUS recessive condition masks the EFFECT of one or both the MEMBER of another gene pair
a situation in which the DOMINANT allele of the first gene pair masks the effect of both the members of the second gene pair and the dominant allele of the second gene pair masks the effect of both the members of the first gene pair
a situation in which one allele does not allow its alternative form to express
a situation in which the dominant allele of one gene pair masks the effect of both members of another gene pair

Answer :A
9375.

Question : Receptor sites for neurotransmitters are present on :

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MEMBRANES of SYNAPTIC vesicles
pre-synaptic membrane
tips of AXONS
post-synaptic membrane

Answer :D
9376.

Question : Recently, the central governmenthas announced a new coin with which of the denomination in 12-edged polygon shape?

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20
10
5
1

Solution :The Centre has announced a NEW Rs 20 COIN which will come in 12-edged polygon(dodecagon) SHAPE. The Finance Ministry stated that the new Rs 20 coin will be made in COPPER, zinc and nickel.
9377.

Question : Receptor absent over tongue in

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THERMORECEPTOR
Gustatoreceptor
PHOTORECEPTOR
NONE of the above

ANSWER :C
9378.

Question : Recently in January 2019, our Tamil Nadu Government had imposed a ban on using 14 different products of plastic origin. Mention any six plastic products that you know

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Solution : (i) Water Packets (ii) PLASTIC straws (III) Plastic carry bags (IV) Thermocol cups (v) Plastic coated paper PLATES (vi) Plastic FLAGS.
9379.

Question : Recently discovered anti-cancer drug is obtained from

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TAXUS
Tagetes
Tamarix
Thea

Solution :Taxus
9380.

Question : Recently a country held its cabinet meeting under the sea. a. Name the country. b. Why was it done?

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Solution :a. Maldives in Indian ocean.
b. To get world.s ATTRACTION about GLOBAL warming and the increase of WATER levels in OCEANS.
9381.

Question : Recent researches suggest that peroxisomes have ……. Origin.

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Cyanobacterial
Fusobacterial
Proteobacterial
Actinobacterial

Answer :D
9382.

Question : Recall the experiments done by Frederick Griffith, Avery, MacLeod and McCarty, where DNA was speculated to be the genetic material. If RNA, instead of DNA was the genetic material, would the heat killed strain of Pneumococcus have transformed the R-strain into virulent strain ? Explain.

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SOLUTION :RNA is more labile and PRONE to degradation (owing to the presence of 2. OH group in its ribose). Hence heat-killed S-strain may not have retained its ability to transform the R-strain into virulent FORM if RNA was its genetic material.
9383.

Question : Recapitulation theory or Biogenetic law

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Solution :THISTHEORY says that "Ontogeny recapitulates EVOLUTIONARY history.
This means an organism repeats its ANCESTRAL history during its development.
9384.

Question : Point out the reasons for Mendel's success.

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Solution :Mendel made wise choice of experimental material he selected pea plant for his EXPERIMENTS fir the following characteristics:(1)Pea plant being a self pollinated plant,it is easy to obtain pure lines for STARTING the BREEDING ecperiments.
(2)It is available inquite a numberof true breeding vsrieties
(3)Pea plant being an ANNUAL herb,it is eay to cultive and study its several generations WITHIN a short period.Therefore,he was successful in his pea-plant experiments.
9385.

Question : Reason of lung cancer is :

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COAL mining
Calcium fluride
Cement factory
Bauxite mining

Answer :C
9386.

Question : Reason of diversity in living being is

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MUTATION
long TERM evolutionary CHANGES
short term evolutionary changes
GRADUAL changes

Answer :B
9387.

Question : Rearrange the following levels in their correct organisational sequence: Landscape, Organism, Ecosystem, Population, Biosphere.

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Solution :ORGANISM `rarr` POPULATION `rarr ` ECOSYSTEM ` rarr ` Landscape `rarr` Biosphere
9388.

Question : Rearrange the following in increasing order of evolution? Gnetales, Ferns, Zosterophyllum, Ginkgo

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SOLUTION :`"ZOSTEROPHYLLUM " to "FERNS " to "GINKGO " to "Gnetales."`
9389.

Question : Rearrange the following events of sexual reproduction in the sequence in which they occur in a flowering plant embryogenesis, fertilisation, gametogenesis, pollination.

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SOLUTION :GAMETOGENESIS, POLLINATION, FERTILISATION, EMBRYOGENESIS.
9390.

Question : Rearrange the electron acceptors of cyclic photophos-phorylation in seqential order: 1. Plastocyanin 2. FRS 3. Ferredoxin 4. Cytochrome-f.

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Solution :1. FRS 2. Ferredoxin 3. Cytochrome-f (4) Plastocynanin.
9391.

Question : Rearrange the descent in human evolution Austrolopithecus rarr Homo erectus rarr Homo sapiens rarr Ramapithecus rarr Homo habilis.

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SOLUTION :Ramapithecus`rarr `Austrolopithecus`rarr `Homo habilis`rarr `Homo ERECTUS`rarr `Homo SAPIENS
9392.

Question : Rearrange the components of the ecosystem and frame a food chain. Also mention the type of food chain. Hawk, Earthworm, Animal excreta and Black bird.

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Solution :Animal EXCRETA `RARR` EARTHWORM `rarr` Black bird `rarr`Hawk. It is a detritus food chain.
9393.

Question : Rearing of fish is called poultry.

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ANSWER :PISCICULTURE
9394.

Question : Reagent used in ELISA test is

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ENDONUCLEASE
POLYMERASE
Ligase
Peroxidase

ANSWER :D
9395.

Question : Real product of apiculture is

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Honey
Beeswax
Both (a) and (B)
NONE of these

Answer :C
9396.

Question : read the statements w.r.t species. (a) on the basis of taxonomic studies, species is the group of individuals with fundamental similarities. (b) each species have distinct morphological characters than other species. (c) species are group of organisms capable of interbreeding and producing fertile offspring. (d) all species with similarities in morphological features are kept in the same genus and assign to same species epithet

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(B) only
(b) & (d) only
(d) only
(a) & (d) only

ANSWER :C
9397.

Question : Read the statements carefully and choose the correct optionA) heat is well adapted to tolerate high temperature. B) Bundle sheath cells of maize seeds are larger thick walled without intercellular space. C) Breakdown of C_4 acid and C_4 pathway occursin bundle seath cells D) C_4 plants shows CO_2 concentration mechanism

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A, B and D are correct
B, C and D are correct
A and D are incorrect
B and C are incorrect

Answer :B
9398.

Question : Read the statements I-V I. They have a special type of leaf anatomy. II. They tolerate higher temperature. III. They show a response to high light insensities IV. They lack photorespiration. V. They have greater productivity of biomass. The above characters are shown by-

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All MONOCOTS
`C_(2)`-plants
All `C_(2)` plants
All `C_(4)` plants

Answer :D
9399.

Question : Read the statements properly and choosen the correct one.

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MANY desert plants have CAM PATHWAY that enables their stomata to REMAIN open during day time.
In Opuntia , leaf reduced into green flattened structure.
Kangaroo RAT in NORTH American deserts is capable of meeting all water requermenets through the protine osidation.
Mammals from colder climate generally have shorter ears and limbs.

Answer :D
9400.

Question : Read the statements below and identify the mode of interaction between the species.Sparrow eating seed

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SOLUTION :PREDATION