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

B. Opaque 2

C. Proline

D. African tall

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

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

B. all the above

C. Sorghum

D. Maize

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

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

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

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

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)

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

B. Ribosome

C. Protein

D. Nucleic acid