plant breeding and genetics MCQs – Page 15

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

plant breeding and genetics Mcqs
281. Cytoplasm fills of the cavity of a cell when if is young. But in nature cells, the cytoplasm________________?
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A. Disappears completely

B. Becomes vacuolated

C. Contracts

D. Disintegrates partially

282. The term vertical resistance and horizontal resistance were first used by________________________?
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A. Van der plank (1963)

B. Karpechenko (1927)

C. Hull (1945)

D. Correns (1900)

283. Organism arise from existing forms by genetic variations is called_________________?
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A. Hybridization

B. Genetics

C. Mutation

D. Genetics
284. Triticuin aestivuin is_________________?
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A. Hexaploid

B. Oetaploid

C. Teuaplioid

D. Triploid

285. In oat an site-specific cross between Ivena sativa and A busantus_____________________?
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A. Partially fertile

B. Incompatible

C. Fully fertile

D. Sterile

286. The first attempt to show linkage in plants were done in____________________?
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A. Another Lamarckian

B. Zeal Mays

C. Lathers odorous

D. Possum sativa

287. Gene responsible for the synthesis of repressor is called__________________?
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A. Operator gene

B. Regulator gene

C. Structural gene

D. Promotor gene

288. Liposomes originated from____________________?
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A. Leucoplasts

B. Mitochondria

C. Ribosomes

D. Plastids
289. Which part of cell is important for and synthesis protoplasm ______________________?
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A. Mitochondria

B. Chloroplast

C. Nucleus

D. Chromosomes

290. An organism or cell having a chromosome number that is higher than the exact nultiple of the basic number is known as__________________?
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A. Allopolyploid

B. Hypoploid

C. Hyperploid

D. Autopolyploid

291. The most recent evolved plant group is ____________________?
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A. grasses

B. Mosses

C. Gymnosperm

D. Confers

292. The cellular structure which always disappears during mitosis is___________________?
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A. Plastids

B. Nuclear and membrane

C. Protoplasm

D. Membrane

293. When two genes are situated very close together in a chromosome_____________________?
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A. Hardly any cross over are detected

B. Only double cross over can take place between them

C. No crossing ever can ever takes place between them

D. The percentage of crossing over between them is very

294. If a heterozygous tall plant is crossed with a homozygous dwarf plant the proportion of dwarf progerry will be__________________?
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A. 50%

B. 25%

C. 75%

D. 100%

295. The first organisms to appear on the earth were more like plants than animals because__________________?
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A. Plants can manufacture their own food material

B. None of the above

C. Plants are similar in structure

D. There are more plants than animals

296. The term cell was introduced in 1665 by__________________?
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A. Maligned

B. Schumann

C. Hook

D. Schneider
297. Dee-Geo-Woogen is the source of dwarfing gene in___________________?
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A. Maize

B. Rice

C. Wheat

D. Sorghum

298. The small unit of DNA capable of undergoing crossing over and recommbination is________________?
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A. Muton

B. Cistron

C. Recon

D. Complan

299. Which one of the following is not found in DNA__________________?
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A. Uracil

B. Guanine

C. Thymine

D. Cystine

300. First intergeneric hybrid between radish and cabbage was made by__________________?
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A. Karechenko (1927)

B. Jones (1917)

C. Fray (1966)

D. Muller (1927)