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 74 of 116
- A. There are many alleles of each gene in each call
- B. There are two alleles of each gene in each cell
- C. There is only one alleles of each gene present in each cell
- D. Non3e4 of the above
Explanation: A haploid cell has only one allele of each gene, so a mutation cannot be hidden by a second normal allele and is expressed whether it…
Correct answer: There is only one alleles of each gene present in each cell- A. Heterogeneous
- B. Homozygous
- C. Homogenous
- D. Heterozygous
Explanation: White offspring from red-flowered parents show that each red parent carried a hidden white allele, so the parents were heterozygous.
Correct answer: Heterozygous- A. One pair of gene can completely mask the expression of another gene pair
- B. Many gene together control a parucular phenotype
- C. One gene pair enhances phenotype expression of another gene pair
- D. One gene pair independently controls a phenotype
Explanation: Epistasis occurs when one gene or gene pair masks the expression of another gene or gene pair.
Correct answer: One pair of gene can completely mask the expression of another gene pair- A. Mathis
- B. Mendel
- C. Darwin
- D. Haldane
Explanation: Thomas Malthus proposed that populations tend to increase faster than the food supply, an idea that influenced Darwin's theory of natural…
Correct answer: Mathis- A. Watson
- B. Crick
- C. Morgan
- D. Koruna
Explanation: Har Gobind Khorana is associated with molecular genetics and recombinant-DNA-related advances; “Koruna” is evidently a misspelling of…
Correct answer: Koruna- A. Phenotypic ratio corresponds to the genotypic ratio
- B. Ratio of genotypes is 3:1
- C. Ratio of phenotypes is 3:1
- D. None of the above
Explanation: With incomplete dominance, the heterozygote has its own intermediate phenotype, so the three F2 genotypes produce three phenotypes in the…
Correct answer: Phenotypic ratio corresponds to the genotypic ratio- A. Incomplete
- B. All the above
- C. Over dominance
- D. Complete dominance
Explanation: Reciprocal recurrent selection improves two populations using their cross-performance and can exploit additive as well as dominance…
Correct answer: All the above- A. Incompatible
- B. Partially fertile
- C. Fully fertile
- D. Sterile
Explanation: Avena sativa and Avena byzantina are both hexaploid oats with essentially the same A, C and D genome constitution.
Correct answer: Fully fertile- A. Lena sativa
- B. Set aria sphacelata
- C. Nicotine sandarac
- D. Scale cereals
Explanation: Gametophytic self-incompatibility was first reported in Nicotiana, including Nicotiana sanderae in the historical breeding literature.
Correct answer: Nicotine sandarac- A. Attmann (1889)
- B. Crick (1953)
- C. Sressler (1968)
- D. Avery et al (1944)
Explanation: Avery, MacLeod and McCarty showed in 1944 that DNA, rather than protein, is the transforming genetic material in bacteria.
Correct answer: Avery et al (1944)- A. Random mating
- B. Out breeding
- C. Iubreeding
- D. Selective mating
Explanation: Random mating allows alleles to combine freely, so allele frequencies remain constant under the Hardy-Weinberg model.
Correct answer: Random mating1472. The small unit of DNA capable of undergoing crossing over and recommbination is________________?
- A. Muton
- B. Recon
- C. Cistron
- D. Complan
Explanation: A recon is the smallest genetic unit capable of undergoing crossing over or recombination.
Correct answer: Recon- A. Operator gene
- B. Structural gene
- C. Promotor geneOrder DNA Kits
- D. Regulator gene
Explanation: The regulator gene produces the repressor protein that controls transcription of structural genes.
Correct answer: Regulator gene- A. Lysosmes
- B. Centrosomes
- C. Microsomes
- D. Ribosomes
Explanation: Lysosomes contain digestive hydrolytic enzymes that can break down cell components when released, earning them the name “suicide bags.”…
Correct answer: Lysosmes- A. Icygen
- B. Hybrogen
- C. Carbon
- D. Nitrogen
Explanation: The two DNA strands are held together by hydrogen bonds between complementary bases: adenine with thymine and guanine with cytosine.
Correct answer: Hybrogen- A. Bacterium
- B. Fungus
- C. Virus
- D. Algae
Explanation: A virus contains either DNA or RNA as its genetic material, not both. Bacteria, fungi, and algae contain DNA and RNA because they are…
Correct answer: Virus- A. ATP
- B. RNA
- C. DNA
- D. DNA/RNA
Explanation: ATP is the cell's immediate and readily available energy currency, and it is not RNA.
Correct answer: ATP- A. Watson and Crick
- B. Scheiiden and Schwann
- C. Sarwin and Wallace
- D. Morgan
Explanation: Matthias Schleiden proposed that plants are made of cells, while Theodor Schwann extended the principle to animals; together they…
Correct answer: Scheiiden and Schwann- A. Discovery of gene
- B. Principles of linkage
- C. Rediscovery of Mendel's
- D. heredity theory
Explanation: In 1900, Mendel's previously overlooked work on inheritance was independently rediscovered by de Vries, Correns, and von Tschermak.
Correct answer: Rediscovery of Mendel's- A. Allopolyploid
- B. Autopolyploid
- C. Euploid
- D. Aneuploid
Explanation: Aneuploid organisms have chromosome numbers that differ from an exact multiple of the basic or monoploid number, such as 2n + 1.
Correct answer: Aneuploid