MCQs-Biology-Basics in agricultural biology Welcome to your Basics in agricultural biology 1. Which of the following best describes the reason behind little genetic studies on roots? Roots does not perform essential role in the crop yield Root traits are difficult to breed Roots are located underground limiting its accessibility in order to study the genetic behaviour Roots are genetically not diverse None 2. Which of the following is not a physical mutagen Gamma rays X-rays Electron beam Ethyl methane sultanate None 3. Different colours of flower are because of… Anthocyanins Carotenoids Chlorophylls Proteins None of the above I and II None 4. Silent mutation is Incorporation of chemically different amino acid in a protein Incorporation of chemically same amino acid in a protein Premature protein Structurally different protein None 5. Which of the following proteins are involved in the degradation of the other proteins? Ubiquitins Receptor kinases Ion transporters Histone proteins None 6. What is IPM Integrated pest mantainance Integrated pest management Innovative plant mutagenesis None of the above None 7. What are mutations? Change in chromatin structures Change in chromatin number Change in the chemical nature of the nitrogenous bases Change in the DNA sequence None 8. What is the harvest index? It is the ratio of the grain yield per unit above ground biomass It is the ratio of grain yield and total plant biomass The ratio of plant biomass to the total grain yield It is the maximum yield produced by a cultivar per unit area None 9. What is the scientific name of rice Oryza sativa Triticum aestivum Brassica juncea Vigna radiata None 10. Backcrossing is used… To introduce a one or few characters in otherwise a elite cultivar Only to test the gene dominance Only to develop NILs None of the above None 11. What is genetic recombination? Broken DNA after repair sometimes generate newer genetic combinations Homologous chromosome cross over that leads to new genetic combination Non homologous end joining repair mechanism also leads to the genetic recombinations All of the above None 12. Why linolenic acid can not be stored for longer time? Because of the inefficient storage methods Residual impurities affect the quality of the linolenic acid It oxidises rapidly It is highly flammable None 13. In cross breeding which of the following increase the probability of obtaining targeted phenotype? Using genetically different parents Crossing between two F1 plants Large F2 population Intragenic crossing None 14. In which crop higher amylose and amylopectin is desirable trait? Pulses Oilseeds Cereals Cotton None 15. Missense mutation Leads to formation of different protein Leads to addition of chemically different amino acid in a protein Leads to Change in non coding part of the gene Is because of the misfolding of the protein None Please fill in the comment box below. Time's up
