plant breeding and genetics MCQs – Page 7

Practise focused plant breeding and genetics questions with marked answers for exam preparation and subject revision.

plant breeding and genetics Mcqs
301. The term useful heterosis was first used by__________________?
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A. Jenkins (1935)

B. Hull (1950)

C. Richey (1914)

D. Meredith and Bridge (1972)
302. The parry of Cauliflower which is eaten is__________________?
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A. Fruit

B. Flower

C. Bud

D. Inflorescence
303. A child is born with an extra chromosome in each of it cells, the reason is___________________?
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A. Non-disjunction

B. Hybridization

C. Segregation

D. Crossing over

304. Heterosis can be fully exploited in the form of_____________________?
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A. Synthetics

B. Composites

C. Hybrids

D. Multi lines

305. A mutant organism (bacterium) that will not grow on a minimal medium does so on the addition of some grown factor is known as __________________?
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A. Auxotroph

B. Autotrophy

C. Heterotroph

D. Axenema

306. In maize source of high lysine is___________________?
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A. Gang as

B. Opaque 2

C. Proline

D. African tall

307. Kinds of nitrogen containing bases fond in RNA are__________________?
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A. Four

B. Six

C. Eight

D. Two

308. Parthenogenesis is most commonly seen in___________________?
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A. Mango

B. Apple

C. Orange

D. Grape
309. Eugenics refers to__________________?
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A. Genetics of eukaryotes

B. Experimental alterations in the structure of the genes

C. Science concerned with improvement of heredity of human race

D. Science concerned with improvement of heredity of animals

310. Maximum vegetable crops belong to the family____________________?
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A. Cucurbitaceae

B. Cruciferae

C. Legumunaceae

D. Solanaceae

311. The offspring of a cross between twp individuals differing in at least one set of characters is called__________________?
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A. Hybrid

B. Mutant

C. Polyploidy

D. Variant

312. Which one is C4 crop plant_____________________?
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A. Sugarcane

B. all the above

C. Sorghum

D. Maize

313. Mutant allele that has little or no effect on the expression of a tart is known as_____________________?
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A. Auxotroph

B. Armor

C. Axoneme

D. Atavism

314. A gene which enhances the natural mutations rate of another gene in the same genome is kanown as___________________?
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A. Mutator gene

B. Mutable gene

C. Recepror gene

D. Articulator gene

315. Polyploidy is most likely to result from ____________________?
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A. Occurrence of karyokinesis

B. Occurrence of crossing over

C. The crossing over between non homologous chromosomes

D. The failure of homologous chromosomes to separate during meiosis
316. Apheliotropic gene is one which___________________?
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A. Affects more than one character

B. Affects only one character

C. Affects more than ten characters

D. Affects more than five characters

317. A mutation which kills 50% of the individual that carry the mutation is known as_________________?
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A. Sub lethal mutation

B. Sub-vital mutation

C. Vital mutation

D. Lethal mutation

318. Which of the following had great influence on Drawing during during formulation of his theory of natural selection_________________?
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A. Mathiss essay on population

B. De Vries theory of mutation

C. Mendess experiment on pea

D. Lamarks idea on inheritance of acquired characters

319. 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
320. Reciprocal recurrent selection is effective with___________________?
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A. Over dominance

B. Complete dominance

C. Incomplete

D. All the above
321. Evolution may be described as___________________?
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A. Inheritance of acquired characters

B. Discontinuous genetic variation

C. Cntinuous genetic variation

D. History of development of larger biological units

322. The chief function of the centro mere concerns___________________?
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A. Chromosome replication

B. Chromosome movement

C. Nucleolus formation

D. Spindle formation

323. What is the function of Gorge bodies__________________?
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A. Segregation of the products of sunthesis

B. Protein synthesis

C. RNA synthesis

D. Photosynthesis

324. The oil content in sunflower is________?
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A. 25-35%

B. 50-60%

C. 35-40%

D. 45-55%

325. Colour blindness is a________?
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A. S*x limited trait

B. S*x influenced trait

C. None of above

D. S*x linked trait
326. The smallest cell organelle so far is_____________________?
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A. Peroxisome

B. Ribosome

C. Spherosome

D. Lysosome

327. From which part of the coconut tem coir is obtained_____________________/
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A. Per carp of fruit

B. Endosperm

C. Inflorescence

D. Leaf

328. In cereals limiting amino acids are________________?
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A. Threonine

B. Lysine

C. a and b

D. Methionine

329. An individual with two identical members of a part of geneue factors is called__________________?
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A. Hybrid

B. Dominant

C. Homozygous

D. Heterozygous

330. In Incern, resistance to spotted aphid is associated with__________________?
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A. High saponin in leaves

B. High silicant content

C. low sinigen in leaves

D. High DIMBOA in leaves

331. The disc florets of sunflower is__________?
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A. Pistillate

B. Staminate

C. Bisexual

D. Usually sterile

332. If two opposite alleles come together, and one of the two finds expression and mask the other in he body this facts is explained as_________________?
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A. Law of inheritance

B. Law of segregation

C. Law of limiting factors

D. Law of dominance
333. The cell theory was propounded by____________________?
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A. Morgan

B. Scheiiden and Schwann

C. Sarwin and Wallace

D. Watson and Crick

334. Superiority of heterozygote in respect to one or more traits in comparison to corresponding homozygote is known as____________________?
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A. Heterocyst

B. Hypostasis

C. Hetropyenosis

D. Epistastasis

335. Nobel prize for the discovery of operon model was awarded to__________________?
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A. Crick (1966)

B. Jacob and monod (1965)

C. Briuen and Davidson (1959)

D. Watson and Crick (1953)

336. Common and easily available source of energy does not contain RNA__________________?
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A. RNA

B. ATP

C. DNA/RNA

D. DNA

337. Number of lindage groups of chromosomes____________________?
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A. Tetraploid number of chromosomes

B. Diploid number of chromosomes

C. None of the above

D. Haploid number of chromosomes
338. Among the following the test cross is_________________?
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A. Ttxtt

B. TTxTt

C. TtxTt

D. TTxTT

339. Mendel studied contrasting characters for his breeding cxperiments with peas which of the following character he did not study_______________?
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A. Plant height

B. Pod color

C. Pod shape

D. Leaf shape
340. A nullisomic individual is represented by________________?
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A. 2n+1

B. 2n+2

C. 2n-2

D. 2n-1

341. Which one of the following is not a cereal crop?
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A. Maize

B. Wheat

C. Paddy

D. Sorghum
342. If the leaf cells have eight chromosomes it is mostly likely that__________________?
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A. Zygote will have 16 chromosomes

B. Gametes will have 8 chromosomes

C. Gametes will have 4 chromosomes

D. Zygote will have 4 chromosomes

343. Year 1900 was significant for geneticists due to__________________?
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A. Discovery of gene

B. heredity theory

C. Principles of linkage

D. Rediscovery of Mendels
344. The change in chromosome number which involves the entire set of genome is known as______________?
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A. Anenploidy

B. Euploidy

C. Trisomy

D. all the above

345. If diploid chromo me number in flowering plant is 8 then 4 chromosomes will be present in_________________?
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A. Synergids

B. Endosperm cell

C. Cotyledonary cell

D. Leaf cells

346. Many groups of insects have developed resistance to DDT and other insecticides as a result of____________________?
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A. Gene mutation

B. Segregation

C. Polyploidy

D. Crossing over

347. A cross of hybrid with one of its recessive parent is termed____________________?
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A. Test cross

B. Trihybrid

C. Hybridization

D. Backcross

348. If a pure tall plant is crossed with a pure dwarf one, the ratio of tall pure dwarf in the F 2 generation after selling F1 plant will be___________________?
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A. 1:1

B. 3:01

C. 2:01

D. 1:02

349. Suppose that out of 1000 offsprings in the generation of a dithered cross, 748 are tall and hairy, 6 are tall and smooth, 4 are short and hairy and 242 are short and smooth. what is the explanation for this kind of ratio ?
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A. Linkage and crossing over

B. Presence of lethal genes

C. Sex-linkage

D. Presence of multiple alleles

350. The carrier of genetic information is __________________?
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A. Carbohydrates

B. Ribosome

C. Protein

D. Nucleic acid