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