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 3 of 17
- A. Microsporogenesis
- B. Gametogenesis
- C. Megasporogenesis
- D. Tapetium
Explanation: Megasporogenesis is the formation of megaspores in the ovule, which leads to the female reproductive pathway.
Correct answer: Megasporogenesis- A. Photophosphorrylation
- B. Photosynthesis
- C. Photoperiodism
- D. None of the above
Explanation: Photophosphorylation is the light-driven formation of ATP through an electron transport chain, usually across the thylakoid membrane.
Correct answer: Photophosphorrylation- A. Gamete formation
- B. Fertilization
- C. Interaction
- D. All the above
Explanation: The fusion of male and female gametes is called fertilization, producing a zygote.
Correct answer: Fertilization- A. Histology
- B. Ontogeny
- C. Phylogemy
- D. None of the above
Explanation: Phylogeny refers to the evolutionary history and relationships of plant species, whereas ontogeny concerns the development of an…
Correct answer: Phylogemy- A. 2-4 micron
- B. 1-4 micron
- C. 40-70 micron
- D. 0.5-2 micron
Explanation: Mitochondria are usually about 0.5 to 2 micrometres in diameter, although their length and shape can vary considerably.
Correct answer: 0.5-2 micron- A. Ribosomes
- B. Plastid
- C. Mitochondria
- D. Golgi bodies
Explanation: Plastids, especially chloroplasts, synthesize carbohydrates through photosynthesis using light energy, carbon dioxide, and water.
Correct answer: Plastid- A. Mitochondria
- B. Nucleus
- C. Chloroplast
- D. Chromosomes
Explanation: The nucleus directs gene expression and controls the synthesis of proteins and other components needed for protoplasm formation.
Correct answer: Nucleus- A. Movement
- B. Respiration
- C. Growl
- D. Protein synthesis
Explanation: Ribosomes translate messenger RNA into polypeptide chains, making them the cellular sites of protein synthesis.
Correct answer: Protein synthesis- A. Thymine present in DNA and Uralic in RNA
- B. Deoxyribose and thymine is present in DNA and ribose and Ural in RNA
- C. Ribose and thymine in DNA and deoxyribose and uracil in RNA
- D. Deoxyribose in DNA and ribose in RNA
Explanation: DNA contains deoxyribose and thymine, whereas RNA contains ribose and uracil.
Correct answer: Deoxyribose and thymine is present in DNA and ribose and Ural in RNA- A. Van Beneden
- B. T. Boveri
- C. Walleye
- D. Aluman
Explanation: The term chromosome was coined by Heinrich Wilhelm Waldeyer in 1888. Option c is evidently intended to represent Waldeyer, but the name is…
Correct answer: Walleye- A. Protein
- B. Ribosome
- C. Nucleic acid
- D. Carbohydrates
Explanation: Nucleic acids, especially DNA, store and transmit hereditary information, while RNA helps express much of that information.
Correct answer: Nucleic acid- A. Episode
- B. Co dominance
- C. Dominance
- D. Epistasis
Explanation: Epistasis occurs when one gene masks or modifies the expression of a non-allelic gene.
Correct answer: Epistasis- A. 9:3:3:1
- B. 9:7
- C. 9:9:9:3:3:3:1
- D. 1:4:6:4:1Government
Explanation: With two additive gene pairs affecting wheat-kernel colour, the F2 classes follow the binomial distribution 1:4:6:4:1, from the two-locus…
Correct answer: 1:4:6:4:1Government- A. B. Protest
- B. Protophyta
- C. Protozoa
- D. Prokaryotes
Explanation: Protophyta is an older term for simple, mostly unicellular plant-like organisms.
Correct answer: Protophyta- A. Audacious
- B. Heterotrophic
- C. Autotrophic
- D. Phototrophic
Explanation: Autotrophs manufacture organic substances from simple inorganic materials such as carbon dioxide and water.
Correct answer: Autotrophic- A. Testes
- B. Muscles
- C. Ovaries
- D. Salivary glands
Explanation: Drosophila has giant polytene chromosomes in its larval salivary-gland cells, where repeated DNA replication makes the chromosomes visibly…
Correct answer: Salivary glands57. The role of nucleus in regulating the morphology of the plant was discovered in___________________?
- A. Acetabularia
- B. pea
- C. Macrospore
- D. Maize
Explanation: Brüchner’s classic experiments with the alga Acetabularia showed that the nucleus controls cell form and regeneration.
Correct answer: Acetabularia- A. Making possible reproduction in all types of environments
- B. Genetic drift occurs because of a small population in to offsprings
- C. They are recessive and carried by heterozygous individuals
- D. They have future survival value
Explanation: A harmful recessive mutation can remain in a population because heterozygous individuals carry it without showing the harmful phenotype.
Correct answer: They are recessive and carried by heterozygous individuals- A. Lathers odorous
- B. Another Lamarckian
- C. Possum sativa
- D. Zeal Mays
Explanation: The first clear demonstration of linkage in plants was made by Bateson and Punnett in sweet pea, Lathyrus odoratus.
Correct answer: Lathers odorous- A. Science concerned with improvement of heredity of human race
- B. Science concerned with improvement of heredity of animals
- C. Experimental alterations in the structure of the genes
- D. Genetics of eukaryotes
Explanation: Eugenics is the proposed science of improving the hereditary qualities of the human population through controlled reproduction.
Correct answer: Science concerned with improvement of heredity of human race