1251. How many times mitotic divisions must occur in a cell of the root tip to form 256 cels___________________?
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A. 32

B. 8

C. 64

D. 120

1252. Bacteria, single celled animals and plants are grouped to gather as_______________________?
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A. Prokaryotes

B. Prototypal

C. Protozoa

D. Protista
1253. When a cell with 40 chromosomes undergoes meiosis each of the four resulting cells has_____________________?
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A. 40 chromosomes

B. 10 chromosomes

C. 20 chromosomes
1254. Genetic selection was proposed by_________________?
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A. East (1920)

B. Stadler (1944)

C. Richy (1927)

D. Hull (1945)

1255. In rice, brown plant hopper has no preference for___________________?
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A. Purple stigma

B. All the above

C. Red pericarp

D. Low aspergine

1256. The genetic constitution of an orgarusm is denoted by____________________?
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A. Genome

B. Phenotype

C. Allele

D. Genotype
1257. Mating system in which each female gamete () with every male gamete is known as____________________?
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A. Genetic disassortative mating

B. None of the above

C. Genetic assortative mating

D. Random mating
1258. Pedigree selection is used in____________________?
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A. Self pollinated plants

B. For crosses at intervener level

C. Cross pollinated plants

D. Plant difficult to hybridized

1259. Estimation of correlation form error variances and covariances is________________?
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A. Phenotypic correlation

B. Simple correlation

C. Environmental correlation

D. Genotypic correlation
1260. Polyploidy is most likely to result from ____________________?
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A. The failure of homologous chromosomes to separate during meiosis

B. The crossing over between non homologous chromosomes

C. Occurrence of karyokinesis

D. Occurrence of crossing over

1261. Hereditary variations in plants have been produced by the use of________________?
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A. Gibberrellic acid

B. Auxins

C. X-rays

D. DDT

1262. The crossing of a yomozygous tall plant and a homozygous dwarf plant would yield plants in the ratio of_________________?
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A. 2 tall: 2 dwarf

B. All the heterozygous tall

C. One homozygous tall, one homozygous dwarf, two heterozygous tall

D. All homozygous dwarf

1263. Heat, cold and frost resistance ideotype have been developed in_____________________?
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A. Cereals

B. None of the above

C. Pulses

D. Millet

1264. Common and easily available source of energy does not contain RNA__________________?
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A. ATP

B. RNA

C. DNA/RNA

D. DNA

1265. High values of genetic advance are indicative of____________________?
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A. Partial dominance gene action

B. non-additive gene action

C. Dominance gene action

D. Additive gene action

1266. The geometrical device that helps in visnalizing all the possible combinations of male and female gametes known as____________________?
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A. Mendel square

B. Punneu square

C. Morgan square

D. Bateson square

1267. Srought is indicated by__________________?
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A. Increase in proline level

B. all the above

C. Increase in ethylene level

D. leaf rolling

1268. Gradual reduction on genetic variability due to elimination of various () is called_______________________?
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A. Centers of diversity

B. Genetic erosion

C. Genetic diversity

D. Land races

1269. Liposomes originated from____________________?
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A. Leucoplasts

B. Plastids

C. Mitochondria

D. Ribosomes

1270. The functional unit of mutation is___________________?
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A. Mouton

B. Gene

C. Gaston

D. Recon

1271. The smell in onion bulb is due to________________?
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A. Bad odour of soil

B. Sulphur compounds

C. Freshy leaves

D. Much sugar

1272. Allogamy is the common form of________________________?
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A. Syn breeding

B. All the above

C. Out breeding

D. Inbreeding

1273. Somatic hybrid Pomato was produced by fusion between potato and tomato by__________________?
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A. Guha and Maheshwari (1974)

B. Sam Norum (1976)

C. Melchers et al (1978)

D. Glebe and Hoffmann (1979)

1274. Which generate variability_________________?
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A. Peleiotropy

B. None of the above

C. Mitosis

D. Meiosis
1275. The food in onion is stored in_________________?
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A. Stem

B. leaves

C. Scale leaves

D. Root

1276. The smallest cell organelle so far is_____________________?
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A. Spherosome

B. Lysosome

C. Ribosome

D. Peroxisome

1277. Discriminant function of plant selection was suggested by____________________?
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A. Yates (1947)

B. Smith (1936)

C. Griffing (1956)

D. Kempt Horne (1957)

1278. A nullisomic individual is represented by________________?
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A. 2n-2

B. 2n-1

C. 2n+1

D. 2n+2

1279. In wheat, example of durable insect resistance includes resistance to___________________?
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A. All the above

B. Stem saw fly

C. Hessian fly

D. Green bugs

1280. The term heterosis was coined by____________________?
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A. Bruce (1910)

B. Shull (1914)

C. Hull (1945)

D. East (1908)

1281. The chromosome number of human race is__________________?
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A. 46

B. 48

C. 44

D. 41

1282. In case of incomplete dominance in the f2 generation_______________________?
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A. Ratio of phenotypes is 3:1

B. None of the above

C. Phenotypic ratio corresponds to the genotypic ratio

D. Ratio of genotypes is 3:1

1283. Duplication of chromosomes occurs during_________________?
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A. Mitosis and meiosis

B. None of the above

C. Mitosis only

D. Meiosis

1284. Global gene bank of barley is located at__________________?
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A. CIP

B. ICRISAT

C. Florida

D. ICARDA
1285. Concept of ideotype was coined by__________________?
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A. Oat

B. Rice

C. Sorghum

D. Wheat
1286. A cross of hybrid with one of its parents is termed as____________________?
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A. Biohybrid

B. Backcross

C. Hybridization

D. Test cross

1287. Homozygous population include_________________?
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A. Multi lines

B. All the above

C. Pure lines

D. Inbreed lines

1288. If the haploid number of chromosomes in a plant is 12, then the number of chromosomes in monosmic is_________________?
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A. 22

B. 24

C. 12

D. 23
1289. Pollen sterility which is controlled by both cytoplasmic and nuclear genes is known as___________________?
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A. GMS

B. CMS

C. all the above

D. CGMS
1290. The most recent evolved plant group is ____________________?
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A. Gymnosperm

B. Confers

C. Mosses

D. grasses
1291. Epitasis implies_____________________?
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A. One gene pair enhances phenotype expression of another gene pair

B. Many gene together control a parucular phenotype

C. One gene pair independently controls a phenotype

D. One pair of gene can completely mask the expression of another gene pair
1292. In wheat, Hessian fly pest is genetically controlled by__________________?
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A. 5D + 5d

B. 1D

C. 2D

D. Cytoplasm

1293. The first ever inter generic crossed has been successfully performed between bamboo and sugarcane by_______________________?
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A. T.S. Verma

B. T.S. Venkatraman

C. R.S. Paroda

D. R.B. Singh

1294. Heterosis can be fixed by___________________?
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A. Polyploidy

B. Asexual reproduction

C. Apomixis

D. All the above
1295. Linkage of hereditary units was discounted by__________________?
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A. W.S. Sutton and K. R. Porter

B. C.B. Bridges and G.H. Shull

C. T.B. Morgan and G. Mendel

D. W. Batson and B.C Pun net
1296. The cell theory was propounded by____________________?
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A. Watson and Crick

B. Sarwin and Wallace

C. Morgan

D. Scheiiden and Schwann
1297. Heterosis can be fully exploited in the form of_____________________?
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A. Synthetics

B. Multi lines

C. Composites

D. Hybrids
1298. All organism or cell having a chromosome number that is not an exact multiple of the monoploid or basic number is known as___________________?
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A. Aneuploid

B. Autopolyploid

C. Euploid

D. Allopolyploid

1299. In the F2 generation, genotypic and phenotypic ratios are identical in cases of___________________?
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A. Mendel lan monohybrids

B. None of the above

C. Incomplete dominance

D. Mendelian dihybrids

1300. Dominance hypothesis of heterosis was first proposed by__________________?
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A. Bruce (1910)

B. Davenport (1908)

C. Shull (1914)

D. Davis (1927)