All Free Agriculture MCQs with Answers
Every Agriculture question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
2,315 questions · page 79 of 116
- A. Allard (91400
- B. Falconer (1960)
- C. Vilomorin (1980)
- D. Harrington (1973)
Explanation: The mass pedigree method is attributed to Harrington and combines early-generation bulk handling with later pedigree selection.
Correct answer: Harrington (1973)- A. All the above
- B. Multi lines
- C. Synthetic
- D. Composites
Explanation: Composites, multilines and synthetic varieties all contain genetically different components, so they are heterogeneous populations.
Correct answer: All the above- A. Falconer (1960)
- B. Jensen (1952)
- C. Goulden (1939)
- D. Johannsen (1903)
Explanation: Jensen developed the multiline variety concept in 1952 by combining several near-isogenic lines carrying different resistance genes.
Correct answer: Jensen (1952)- A. Gene sequencing
- B. Micro cloning
- C. Gene splicing
- D. Gene cloning
Explanation: Gene cloning means producing many identical copies of a particular gene or DNA sequence, usually by inserting it into a vector and…
Correct answer: Gene cloning1565. Somatic hybrid "Pomato" was produced by fusion between potato and tomato by__________________?
- A. Glebe and Hoffmann (1979)
- B. Guha and Maheshwari (1974)
- C. Sam Norum (1976)
- D. Melchers et al (1978)
Explanation: Melchers and colleagues produced the somatic hybrid pomato by fusing potato and tomato protoplasts in 1978.
Correct answer: Melchers et al (1978)- A. Plasma genes
- B. Nuclear genes
- C. Monoalleleic genes
- D. None of the above
Explanation: Cytoplasmic male sterility is controlled by factors in the cytoplasm, especially mitochondrial genes, rather than by nuclear genes alone.
Correct answer: Plasma genes- A. Asexual reproduction
- B. Sexual reproduction
- C. Apomixes
- D. None of the above
Explanation: Amphimixis is reproduction involving the fusion of male and female gametes, so it is sexual reproduction.
Correct answer: Sexual reproduction- A. Maize
- B. Caster
- C. Colocasia
- D. All the above
Explanation: Maize, castor and colocasia bear male and female flowers on the same plant, which is the definition of monoecy.
Correct answer: All the above- A. Gramineae
- B. Solanaceae
- C. Cruciferae
- D. None of the above
Explanation: In grasses of the family Gramineae, self-incompatibility is commonly controlled by two loci, designated S and Z.
Correct answer: Gramineae- A. Diallelic SL
- B. Ovarian SL
- C. Polyallelic SL
- D. Styler SL
Explanation: When incompatibility genes are expressed in the style or pistil tissue, the system is called stylar self-incompatibility.
Correct answer: Styler SL- A. None of the above
- B. Gerstel (1950)
- C. East (1940)
- D. Koelreuter (1763)
Explanation: The term self-incompatibility is generally credited to East and Mangelsdorf, a name and date not included among the options.
Correct answer: None of the above- A. Inbreeding
- B. Out breeding
- C. Amphimixis
- D. All the above
Explanation: Mating between genetically or geographically distant individuals is called outbreeding, which introduces variation and generally increases…
Correct answer: Out breeding- A. Male sterility
- B. Dichiny
- C. Herkogamy
- D. All the above
Explanation: Male sterility prevents self-pollination, dichogamy separates anther and stigma maturity, and herkogamy places them apart.
Correct answer: All the above1574. When pollination and fertilization occur in unopened flower bud it is known as__________________?
- A. Cleistogamy
- B. Hamogamy
- C. Chasmogamy
- D. All the above
Explanation: Cleistogamy is self-pollination and fertilization within a flower that remains closed or unopened.
Correct answer: Cleistogamy- A. Homozy gosity
- B. Heterozy gosity
- C. Segregation
- D. none of the above
Explanation: Allogamy involves fertilization between genetically different plants, so it tends to maintain or increase heterozygosity in a population.
Correct answer: Heterozy gosity- A. Bruce and Keebel (1908)
- B. Mather (1953)
- C. Sewell Wright (1921)
- D. Shall and East (1920)
Explanation: Sewall Wright described major systems of mating, including random mating, inbreeding, and assortative or disassortative mating, in his…
Correct answer: Sewell Wright (1921)- A. Centers of diversity
- B. Micro centers
- C. Gene sanctuaries
- D. Genetic diversity
Explanation: A center of diversity is a geographical region where a crop and its relatives show especially wide genetic variation.
Correct answer: Centers of diversity- A. Active collection
- B. Indigenous collection
- C. Working collection
- D. Exotic collection
Explanation: Germplasm collected from and originating within its own country is called indigenous collection.
Correct answer: Indigenous collection- A. Modern cultivars
- B. Advanced breeding materials
- C. All the above
- D. Land race
Explanation: A gene pool in crop breeding may include the genetic resources available for improvement, such as modern cultivars, advanced breeding…
Correct answer: All the above- A. Obsolute cultivars
- B. Gene bank
- C. Ex-situ conservation
- D. In-situ conservation
Explanation: In-situ conservation keeps germplasm alive in its natural habitat, allowing populations to continue adapting there.
Correct answer: In-situ conservation