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1251.

Question : What percentage of global carbon does the atmosphere contains ?

Answer»

`30%`
`19%`
`21%`
`1%`

SOLUTION :`1%`
Discussion
1252.

Question : What part of plants is best suited for making virus-free plants, and why?

Answer»

Solution :The terminal or intercalary BUDS that have apical meristem are best SUITED because these are generally virus-free PLANT parts.
Discussion
1253.

Question : What parameters are used for tiger census in our country's national park and sanctuarles ?

Answer»

PUG marks only 
Pug marks and faecal PELLETS 
Faecal pellets only
Actual head COUNTS 

ANSWER :B
Discussion
1254.

Question : What parameters are used for tiger census in our country's national parks and sanctuaries?

Answer»

PUG MARKS only
FAECAL PELLETS only
Actual HEAD counts
Pug marks and Faecal pellets

Answer :D
Discussion
1255.

Question : What of these interactions has negative effects ? (i) Predation (ii) Mutualism (iii) Commensalism (iv) Parasitism

Answer»

(i) and (III)
(i) and (IV)
(II) and (iii)
(i) only

Answer :B
Discussion
1256.

Question : What of the following polysaccharide is wrongly matched with its monomer ?

Answer»

`{:("Glycogenh","Glucose"):}`
`{:("Chitin","N - ACETYL glucosamine (NAG)"):}`
`{:("INULIN","MANNOSE"):}`
`{:("Mucopolysaccharide","Amino sugars and other chemically modified sugars "):}`

ANSWER :C
Discussion
1257.

Question : What % of productivity is contributed by Oceans?

Answer»

SOLUTION :55 BILLION TONS
Discussion
1258.

Question : What modification is done on the Ti plasmid of Agrobacterium tumefaciens to convert it into a cloning vector ?

Answer»

SOLUTION :The tumor inducing (Ti) plasmid of Agrobacterium tumifaciens has now been modified (disarmed) into a cloning vector. It is not pathogenic to the PLANTS but is still ABLE to use the MECHANISMS to deliver GENES of our interest into a variety of plants.
Discussion
1259.

Question : What might be an advantage of beginning gene therapy prior to birth ?

Answer»

This WOULD give the body PLENTY of time to utilise the new genes
The body would not reject it as it has not YET recognised self
The cells being extremely young, are mor receptive of gene therapy
There PROBABLY is not any advantage

Answer :B
Discussion
1260.

Question : What measures can be taken for prevention and control of alcohol and drugs abuse among adolescents ?

Answer»

Solution :Avoid UNDUE peer pressure : Every child has his/her own choice and personality, which should be respected and nurtured. A child should not be pushed unduly to perform beyond his/her threshold limits, be it STUDIES, sports or other activities. Education and counseling :
Education and counseling him/her to face problems and stresses, and to accept disappointments and failures as a part of life. It would be worthwhile to channelize the child.s energy into healthy pursuits like sports, reading, music, yoga and other extracurricular activities.
Seeking help from parents and peers : Help from parents and peers should be sought immediately so that they can guide appropriately. Help may even be sought from CLOSE and trusted FRIENDS. Besides getting proper advise to sort out their problems, this would help young to vent their feelings of anxiety and guilt.
LOOKING for danger signs : Alert parents and teachers need to look for and identify the danger signs discussed above. Even friends, if they find someone using drugs or alcohol, should not hesitate to bring this to notice of parents or teachers in the best interests of the person concerned. Appropriate measures would then be required to diagnose the malady (disease or ailment) and the underlying causes. This would help in initiating proper remedial steps or treatment.
Seeking professional and medical help : A lot of help is available in the form of highly qualified psychologists. Psychiatrists, and de-addiction and rehabilitation programmes to help individuals who have unfortunately got into the quagmire of drug/alcohol abuse, with such help, the affected individual with sufficient efforts and will power, can get rid of the problem completely and lead a perfectly normal and healthy life.
Discussion
1261.

Question : What measures will you adopt to conserve the biodiversity of our country?

Answer»

SOLUTION :Protect HABITAT, In SITU conservation, Ex-situ conservation, Antipoaching LAWS.
Discussion
1262.

Question : What measures will you adopt to conserve the biodiversity in our country?

Answer»

SOLUTION :i. Protection of HABITAT
ii. In situ conservation
iii. EX situ conservation
IV. Antipoching laws
Discussion
1263.

Question : Whatmeasures,as onindividual ,youwould taketo reduce enviromental pollution ?

Answer»

SOLUTION :Encourge afforestation .
Preventdeforestation.
Controlled tappingof groundwater.
Reductionof the PRODUCTION and usedof pastic ,SPRAYER etc.
PROTECT our pondsand WATERBODIES .
Discussion
1264.

Question : What measures as an individual would you take to reduce environmental pollution ?

Answer»

Solution :To reduce environmental pollution we should take FOLLOWING measures : (i) Reducing use of CFC. (ii) Disposing off waste safely. (iii) Reducing use of polythene. (iv) Not disposing off waste in water bodies. (V) Making automobiles pollution free. (vi) Prevention of noise pollution by USING fire crackers/TV/musical instruments at PERMISSIBLE limits. (vii) Tree plantation in SCHOOL, around residence.
Discussion
1265.

Question : What measure would you take to prevent waterborne diseases ?

Answer»

Solution :To prevent water borne disease, water bodies, ponds, water TANKS, reservoirs in the city or village should be cleaned PERIODICALLY.
The proper disposal of domestic waste, excreta, sewage should be done.
At personal level, boiling of water, using water purifier, WASHING HANDS before and after meals should be PRACTICED.
Discussion
1266.

Question : What measure would you take to prevent water-borne diseases?

Answer»

Solution :To prevent water-borne DISEASES, water storage utensils should be cleaned and COVERED to avoid contamination by flies. Drinking water should be free from any disease-causing agent, therefore, it should be chlorinated or boiled and filtered. Water reservoirs should be disinfected regularly. Any human ACTIVITY like bathing, washing and defecating should be prohibited NEAR the water sources like hand pumps, wells and RIVERS.
Discussion
1267.

Question : What may be the reasons for the entry of wild lives into the agriculatural lands or towns?

Answer»

Solution :(a) HABITAT LOSS / Habitat fragmentation
(b) Lack of food or WATER source.
Discussion
1268.

Question : What map unit (Centimorgan) is adopted in the construction of genetic maps?

Answer»

A. A unit of DISTANCE between two EXPRESSED genes, REPRESENTING 10% CROSS over
B.A unit of distance between two expressed genes, representing 100% cross over
C. A unit of distance between genes on chromosomes, representing 1% cross over
D. A unit of distance between genes on chromosomes, representing 50% cross over

Solution :A unit of distance between genes on chromosomes, representing 1% cross over
Discussion
1269.

Question : What makes the Trichoderma an effective bio-pesticide?

Answer»

Solution :Trichoderma SPECIES are free-living FUNGI that are common in soil an root ecosystem. They have been recognized as bio-control agent for (1) the control of plant disease (2) ability to enhance root growth development (3) CROP prouctivity (4) resistance to abiotic stress and (5) uptake and USE of NUTRIENTS.
Discussion
1270.

Question : What makes the DNA and RNA as acidic molecules?

Answer»

Solution :The phosphate FUNCTIONAL group `(PO_(4))` gives DNA and RNA the property of an acid at PHYSIOLOGICAL pH, HENCE the name NUCLEIC acid.
Discussion
1271.

Question : What made Dr.M.S. Swaminathan famous?

Answer»

He Is a horiculturist
Geneticist
Plant breeder
All of these

Answer :C
Discussion
1272.

Question :What makes cyanobacteria a very good source of biofertilisers?

Answer»

SOLUTION :These derive ENERGY needed for nitrogen FIXATION through PHOTOSYNTHESIS.
Discussion
1273.

Question : What 'lac' indicate in lac operon ?

Answer»

1,00,000 AMOUNT
LACTOSE
LACTASE
INSECT

SOLUTION :Lactose
Discussion
1274.

Question : What kind of plants are produced by selfing of monosomics?

Answer»

SOLUTION :NULLISOMICS
Discussion
1275.

Question : What kind of placenta develops in human ?

Answer»


ANSWER :CHORIONIC
Discussion
1276.

Question : What kind of natural selection operates,when nature selects only one extreme trait of a character?

Answer»

STABILIZING selection
Disruptive selection
Directional selection
Normalising selection

Answer :C
Discussion
1277.

Question : What kind of nervous system is seen in Hydra, earth-worm and cockroach?

Answer»

SOLUTION :In Hydra, the NERVOUS SYSTEM is in the form of nerve net, while in EARTHWORM and cockroach the nervous system is ganglionated.
Discussion
1278.

Question : What kind of evidencesuggested thatman ismoreclosely with chimpazee than with orther hominoid apes ?

Answer»

EVIDENCE from DNA from SEX CHROMOSOMES only
Comparison of chromosomesmorphologyonly
Evidance from fossil remains, and the fossilmitochondrial DNA ALONE
Evidencefrom DNA extractedfrom sex CHROMOSOME , autosomes .

Answer :D
Discussion
1279.

Question : What kind of evidence suggested that man is more closely related with chimpanzee than with other hominoid apes?

Answer»

Evidence from DNA from sex CHROMOSOMES only
Comparison of chromosomes MORPHOLOGY only
Evidence from FOSSIL remains and the fossil MITOCHONDRIAL DNA alone
Evidence from DNA extracted from sex chromosomes, autosomes and mitochondria

Solution :Evidence from DNA extracted from sex chromosomes, autosomes and mitochondria
Discussion
1280.

Question : What kind of evidences suggested that man is more closely related with chimpanzee than with other hominoid apes?

Answer»

Evidence from DNA of SEX chromosomes, only
Comparison of chromosome morphology and number
Evidence from fossil remains, and the fossil mitochondrial DNAalone
Evidence from banding pattern of chromosome 3 and 6

Solution :A comparative study of the banded chromosome of man and the great ape has SHOWN that the total AMOUNT of DNA in human diploid cells and that of the ape is more or less similar. It has also been observed that the banding pattern of individual human chromosomes is very similar to the banding pattern of CORRESPONDING chromosomes in ape. The banding pattern of human chromosome numbers 3 and 6 are compared with those of particualr autosomes in the CHIMPANZEE. It shows a common origin for man and chimpanzee.
Discussion
1281.

Question : What kind of evidence is afforded by the Darwin's finches in support of organic evolutions?

Answer»

SOLUTION :ADAPTIVE RADIATION
Discussion
1282.

Question : What kind of detritus decomposes at a faster rate? Name any two factors that enhance the rate of decomposition.

Answer»

SOLUTION :DETRITUS rich in, water soluble SUBSTANCE like SUGAR
FACTORS - Warm temperature / moist environment availability of oxygen
Discussion
1283.

Question : What isthe common to following fishes Hilsa sandines ,Mackerel,pomfrets

Answer»

they are not edible
Economically not VIABLE
marine in NATURE
All are fresh water FISHES

ANSWER :Mrine in nature
Discussion
1284.

Question : What is zero Stress ?

Answer»

SOLUTION :STRESS refers to any ENVIRONMENTAL factor CAUSING a change in the biological SYSTEM which is potentially injurious
Discussion
1285.

Question : Whatis xerarch succession?

Answer»

Solution :Xerarch SUCCESSION TAKES place in dry areas and the SERIES progress from xeric to mesicconditions.
Discussion
1286.

Question : What is Y linked inheritance? Give an example.

Answer»

Solution :Inheritance of SOMATIC characters linked with GENES present on homologous part of Y-chromosome is called linked inheritance EXAMPLE: HYPERTRICHOSIS
Discussion
1287.

Question : What is Xerarch succession?

Answer»

SOLUTION :Plant succession which TAKE PLACE in dry area and CHANGES the dry area into mesic area is called Xerarch succession.
Discussion
1288.

Question : What is X, Y, Z in the given figure of DNA.

Answer»

X - Promotor, Y - Coding sequence,
Z - Initiation SITE.
X - Termination site, Y - Coding sequence,
Z - Promotor,
X - Promotor, Y - Coding sequence
Z - Termination site.
X - Termination site, Y - Coding sequence,
Z- Initiation site.

SOLUTION :X - Promotor, Y - Coding sequence,
Z- Termination site.
Discussion
1289.

Question : What is wrong statement about AIDS ?

Answer»

It is not DETECTED during asymptomatic phase
During AIDS, `CD_(4)` : `CD_(8)` count are 1 : 1
HIV–I is common in India
Two IDENTICAL SS RNA, molecules are present in HIV

Answer :A
Discussion
1290.

Question : What is vulcanization? Who invented it?

Answer»

SOLUTION :The heating of the rubber with sulphur under pressure at `150^(@)C` is CALLED VULCANIZATION. It was invented by Charles Goodyear.
Discussion
1291.

Question : What is vivipary? Name a plant group which exhibits vivipary.

Answer»

SOLUTION :Viviparity is the PHENOMENON, where the seeds germinate and then starts developing to some extent before they DETACH from the parent PLANT BODY. In plant, it is noticed in Halophytes like Rhizophora.
Discussion
1292.

Question : What is VNTR? Who isolated them?

Answer»

SOLUTION :VNTR STANDS for Variable Number of Tandem Repeats.VNTR's were first ISOLATED and identified by A. Wyman and R. White in 1980 at the University of Utah.
Discussion
1293.

Question : What is vegetative reproduction ? Describe any three natural methods of vegetative reproduction with examples.

Answer»

Solution :1. Vegetative reproduction : Vegetative reproduction is a kind of asexual reproduction which occurs with the help of vegetative organs like, root, stem, leaf or bud.
It is seen in plants like sweet potato, potato, sugar cane, BRYOPHYLLUM, etc.
2. Three natural methods of vegetative reproduction :
(i) Tuberous roots e.g. sweet potato :

(1) Sweet potato (Tuberous root) is the modification of root for vegetative propagation.
(2) It is swollen due to the deposition of food MATERIAL.
(3) These adventitious buds sprout under favourable conditions to produce leafy shoots.
(ii) Stem tuber e.g. potato :
(1) Potato is an underground modification of stem.
(2) It is thick and fleshy, due to the storage of food material.
(3) Potato bears a number of notches on its surface, called 'eyes'.

(4) Each bud or 'eye' is actually a NODE bearing ONE or more axillary buds and reduced scaly leaves.
(5) After the dormancy period is over, one of axillary buds from an eye which sprouts by suppressing the growth of other buds and producesa new plant.
(6) The tuber or its pieces bearing at least one eye are grown separatelyin the field for the commercial production or cultivation of potatoes.
(iii) Vegetative reproduction in Bryophyllum : (1) Bryopohyllum reproduces vegetatively by means of leaf buds which are formedin mariginal notches of the leaf.

(2)The buds that are formed in the marginal notches of the Bryophyllum leaf are called adventitious buds.
(3) The leaf buds give rise to new plants.
Discussion
1294.

Question : What is vegetative propagation ? Give two suitableexamples.

Answer»

Solution :VEGETATIVE propagation is the process of multiplication where new plants develop from any portion of the vegetative organs of the plant without involving the seeds.
It occurs in lower as well as higher plants.
Examples : (i) Buds (EYES) of potato (II) RHIZOME of ginger.
Discussion
1295.

Question : What is 'vegatative reproduction' ?Explain 'any three' natural methods of vegetative reproduction with the help of suitable diagrams.

Answer»

Solution :The reproduction which occurs wihout involving meiosis and fusion of GAMETES is called asexual reproducetion. Vegetation reproduction is a type of asexual reproduction in which a new plant grows from a fragament of the parent plant or a specialized reproduction sturctures.

1.Tuberous roots : The underground roots store plenty of RESERVE food and become swollen. Such swollen roots are called tuberous roots.
The tuberous roots are adventitious and MAY be prodcued singly or in groups or cluster and are called simple tuberous and fasciculated tuberous roots.
They are irregularly swollen tapering towards both the ends, dark and blackish -red coloured structures. In Asparagus and Dahlia they are produced in cluster.

2. Stem tubers : In potato plant, the basal and underground part of stem PRODUCES axillary or EXTRA axillary underground braches. The terminal part of such branches becomes swollen dur to storage of starchy reserve food. These swollen tips of underground branches of stem are called stem tubers.

3. Runner : Runner is a slender prostrate, subaerial branch which creeps horizontally on the soil. It is produced by the plants like cynodon (doob grass). Fragaria (Strawberry) and oxalis etc. For vegetative propagation.
Discussion
1296.

Question : What is vegetative propagation? Give two suitable examples.

Answer»

Solution :The regeneration of NEW PLANTS from portions of vegetative organs is called vegetative propagation. Vegetative propagation takes place NATURALLY or artificially. Natural vegetative reproduction takes place by stem, root, LEAVES, and reproductive organs. e.g., Rhizome (e.g., ginger, ba-nana), Stem tuber (e.g., potato), Root (e.g., Albizia lebbeck).
Discussion
1297.

Question : What is vegetative propagation?

Answer»

Solution :The reproduction which occurs with the help of VEGETATIVE ORGANS like root, stem, leaf or BUD is called vegetative reproduction or vegetative PROPAGATION.
Discussion
1298.

Question : What is vaccine ? What are its types ?

Answer»

Solution :A vaccine is a biological preparation that provides active acquired immunity to a particular disease and resembles a disease causing microorganism and is often made from WEAKENED or ATTENUATED or KILLED forms of the MICROBES ,their toxins ,or one of its SURFACE protiens .The vaccines are classified as first ,second and third generation vaccines.
Discussion
1299.

Question : What is VAM?

Answer»

Solution :VAM is the SHORT FORM of VESICULAR ARBUSCULAR Mycorrhizae.
Discussion
1300.

Question : What is vaccine

Answer»

SOLUTION :Vaccine is an antigenic prepagation USED used to stimulate the PRODUCTION of ANTIBODIES and induce immunity against SEVERAL diseases.
Discussion