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 72 of 116
- A. Proline
- B. Opaque 2
- C. Gang as
- D. African tall
Explanation: The opaque-2 mutant in maize increases the proportion of lysine and improves the grain's protein quality.
Correct answer: Opaque 2- A. Threonine
- B. Lysine
- C. Methionine
- D. a and b
Explanation: Lysine is commonly the first limiting amino acid in cereal grains, while threonine is also nutritionally limiting in many cereal-based…
Correct answer: a and b- A. Nucleus
- B. Chloroplast
- C. Cutoplasm
- D. Vacuole
Explanation: A vacuole is enclosed by the tonoplast, a selectively permeable membrane that regulates exchange between the vacuolar sap and cytoplasm.
Correct answer: Vacuole- A. Plasma membrane
- B. Cellulose cell wall
- C. Nuclear membrane
- D. Epidermis
Explanation: The cellulose cell wall forms the outermost boundary of a plant cell and lies outside the plasma membrane.
Correct answer: Cellulose cell wall- A. 2000 times
- B. 4000 times
- C. 400,000 times
- D. 200,000 times
Explanation: Traditional biology texts commonly give about 200,000 times as the maximum magnification of an electron microscope, far above the limit of…
Correct answer: 200,000 times- A. Peroxisome
- B. Spherosome
- C. Lysosome
- D. Ribosome
Explanation: Ribosomes are the smallest cell organelles, generally about 20–30 nm in diameter, and they carry out protein synthesis.
Correct answer: Ribosome- A. Segregation of the products of sunthesis
- B. Protein synthesis
- C. Photosynthesis
- D. RNA synthesis
Explanation: “Gorge bodies” refers to Golgi bodies, which modify, package and segregate materials produced in the cell, especially secretory products.
Correct answer: Segregation of the products of sunthesis- A. Cowdry
- B. Altmann
- C. Palade
- D. Garner
Explanation: George Emil Palade discovered ribosomes using electron microscopy and studied their role in protein synthesis.
Correct answer: Palade- A. Disintegrates partially
- B. Disappears completely
- C. Contracts
- D. Becomes vacuolated
Explanation: As a plant cell matures, its vacuole enlarges and the cytoplasm is pushed toward the periphery, becoming vacuolated.
Correct answer: Becomes vacuolated- A. Watson and Crick
- B. Tatum
- C. Koran
- D. Dtanele
Explanation: Watson and Crick proposed the double-helical model of DNA in 1953, using evidence including Chargaff’s rules and X-ray diffraction…
Correct answer: Watson and Crick- A. Van Mohl
- B. Miescher
- C. Benda
- D. Schultz
Explanation: Friedrich Miescher isolated the acidic substance now known as nucleic acid from cell nuclei in 1869.
Correct answer: Miescher- A. DNA
- B. RNA
- C. DNA & RNA
- D. DNQA and protein
Explanation: Nucleic acids are the two major genetic polymers, DNA and RNA, both made of nucleotide units.
Correct answer: DNA & RNA- A. Lysosomes
- B. Ribosomes
- C. Lysozymes
- D. Dictysomes
Explanation: Lysosomes contain hydrolytic enzymes that digest cellular waste, foreign particles and worn-out organelles, so they are often called…
Correct answer: Lysosomes- A. Any two members of a Genus
- B. Any two members of a Species
- C. Any two members of a Family
- D. Any two members of an order
Explanation: Interbreeding is generally possible among members of the same species because they share sufficiently compatible genetic systems and can…
Correct answer: Any two members of a Species- A. 25%
- B. 75%
- C. 50%
- D. 40$
Explanation: If the dominant phenotype is 75%, the recessive phenotype is 25%, so under Hardy-Weinberg equilibrium q² = 0.25, giving q = 0.5 and p =…
Correct answer: 50%- A. TT and Tt only
- B. TT and tt only
- C. Tt and Tt only
- D. TT Tt and tt
Explanation: A 3:1 tall-to-short ratio indicates a cross between two heterozygotes, Tt × Tt. Its offspring can therefore contain TT, Tt and tt genotypes.
Correct answer: TT Tt and tt- A. Ribosome's
- B. Microtubules
- C. Episodes
- D. Mitochondria
Explanation: Ribosomes are the cellular structures that translate messenger RNA into polypeptide chains, so they directly carry out protein synthesis.
Correct answer: Ribosome's- A. Hypoploid
- B. Hyperploid
- C. Allopolyploid
- D. Autopolyploid
Explanation: Hyperploid describes a chromosome number above the normal euploid or exact multiple of the basic chromosome number.
Correct answer: Hyperploid- A. Allopolyploid
- B. Amphidiploids
- C. End polyploidy
- D. Aneupoidy
Explanation: Endopolyploidy occurs when chromosomes replicate without normal cell division, producing somatic cells with multiples of the diploid…
Correct answer: End polyploidy- A. None of the aboveDownload Nature Guides
- B. Genetic drift
- C. Gene frequency
- D. Gene flow
Explanation: Gene flow is the movement of alleles between populations through migration and subsequent reproduction, which can alter allele…
Correct answer: Gene flow