MCQs Biology-20 Posted on November 27, 2025December 3, 2025Author agropublishers 0 MCQs Biology-20 1. Which example cannot describe a sample? 25 students chosen randomly 12 leaves measured from one tree 105 plants chosen from a field All plants in the field 2. The discovery of mustard gas as a mutagen was significant because it showed that __________. Mutations were always lethal Mutations could not be induced artificially Chemicals could also induce heritable genetic changes Radiation was the only mutagenic agent 3. A protoplast is best defined as _____________ The plasma membrane and all cellular contents it surrounds A plant cell with its cell wall removed A plant cell, after removing its cell wall, containing the plasma membrane and all cellular contents it surrounds The living part of a cell, including the cytoplasm and nucleus 4. Recombinant DNA technology is primarily used in ———– Ecosystem monitoring Molecular cloning Anatomy studies Fossil analysis 5. Toxicology studies ———– DNA replication Harmful effects of chemicals on organisms Protein synthesis Beneficial chemicals 6. Rhizobium is an example of ———–bacteria Chemosynthetic Saprophytic Parasitic Symbiotic nitrogen-fixing 7. Microscopic gaps between the endings of one neuron and another cell are called__________ Nodes Transmitters Pores Synapses 8. The number of crossovers per bivalent depends on ——– Cytoplasmic volume Chromosome size Cell size Centriole number Loading … Question 1 of 8
