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Free Plant Breeding and Genetics MCQs with Answers

329 Plant Breeding and Genetics MCQs from Agriculture, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

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329 questions · page 17 of 17

321. Dwarf varieties of wheat are more resistance to_______________?

  • A. Lodging
  • B. Insect pest
  • C. Disease
  • D. Viruses

Explanation: Dwarf wheat varieties have shorter and stronger culms, so they are less likely to bend or fall under wind, rain or heavy grain heads.

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Correct answer: Lodging

322. When crop plants adopt to a new environment are called___________________?

  • A. Accaumatization
  • B. Domestication
  • C. Selection
  • D. Introduction

Explanation: The adjustment of crop plants to a new environment is called acclimatization, commonly spelled acclimatisation in British usage.

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Correct answer: Accaumatization

323. There has been emphasis on the conservation of wild relatives of cultivated plants because wild plants________________?

  • A. Grow better then cultivated plants
  • B. Serve, as valuable fodder plants
  • C. Needed to understand the origin of cu;cultivated plants
  • D. Carrying many useful genes which are lost in cultivated plants

Explanation: Wild relatives often retain resistance, quality and environmental-adaptation genes that were lost during crop domestication and selection.

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Correct answer: Carrying many useful genes which are lost in cultivated plants

324. Prescribed germination percentage of foundation seed of ground nut is_________________?

  • A. 70
  • B. 20
  • C. 85
  • D. 90

Explanation: Foundation groundnut seed is required to have a minimum germination percentage of 85% under the usual seed standards.

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Correct answer: 85

325. Seeds which dried at low moisture contents and stored at low temperature without loosing their viability are________________?

  • A. Orthodox seeds
  • B. Active seeds
  • C. Recalcitrant seeds
  • D. Certified seeds

Explanation: Orthodox seeds tolerate drying to low moisture content and can be stored at low temperatures without losing viability.

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Correct answer: Orthodox seeds

326. Pulling of off- type plants from a cropped field is called___________________?

  • A. Pruning
  • B. Weeding
  • C. Rouging
  • D. None of the above

Explanation: Rouging means identifying and removing off-type or diseased plants from a crop so varietal purity is maintained.

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Correct answer: Rouging

327. Gassypium hirsutum was developed from a cross between________________?

  • A. G.arbarieum and G. rainmundii
  • B. G.arbarieum and G.thurberii
  • C. G.arbarieum and G.barbadense
  • D. G.arbarieum and G.herbaceum

Explanation: Gossypium hirsutum, the main American or upland cotton, is traditionally described as arising from a cross between G. arboreum and G.

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Correct answer: G.arbarieum and G.thurberii

328. Gassypium arborium is__________________?

  • A. Diploid
  • B. Tetraploid
  • C. Triploid
  • D. Haploid

Explanation: Gossypium arboreum is diploid, with 2n = 26 chromosomes, and belongs to the Old World cotton group. Tetraploid cottons include G.

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Correct answer: Diploid

329. Botanical name of American cotton is_________________?

  • A. G. arborium
  • B. G. hirsutum
  • C. G. barb dense
  • D. Non of these

Explanation: Gossypium hirsutum is commonly called American cotton or upland cotton and is the most widely cultivated cotton species. G.

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Correct answer: G. hirsutum
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